Updated on 2025/06/15

Information

 

写真a

 
IIKUBO SATOSHI
 
Organization
Faculty of Engineering Sciences Department of Advanced Materials Science and Engineering Professor
Interdisciplinary Graduate School of Engineering Sciences Department of Interdisciplinary Engineering Sciences（Concurrent）
School of Engineering （Concurrent）
Title
Professor
Contact information
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Profile
物質内部の電子状態を明らかにする「第一原理計算」、物質の地図とよばれる「状態図」などを駆使して、新物質探索法や材料組織制御法を研究しています。具体的には太陽電池、熱電材料、二次電池などに適用し、物性物理学と材料組織学の観点から、次世代の構造・機能性材料の開発を行っています。
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Research Areas

  • Nanotechnology/Materials / Structural materials and functional materials

Degree

  • Doctor of Science

Research History

  • Kyushu University Faculty of Engineering Sciences Department of Advanced Materials Science and Engineering  Professor 

    2021.4 - Present

  • Kyushu Institute of Technology 大学院生命体工学研究科 Associate Professor 

    2014.1 - 2021.3

  • Kyushu Institute of Technology 大学院生命体工学研究科 Assistant Professor 

    2009.1 - 2013.12

  • Tohoku University 原子分子材料高等研究機構 Research Assistant 

    2008.4 - 2008.12

Education

  • Nagoya University   理学研究科   物質理学専攻

    2000.4 - 2005.3

  • Nagoya University   理学部   物理学科

    1996.4 - 2000.3

Research Interests・Research Keywords

  • Research theme： Local structural analysis of Sn based organic-inorganic perovskite

    Keyword： Computational science

    Research period： 2021.6 - Present

  • Research theme： Development of thermoelectric conversion device using organic-inorganic interface

    Keyword： Computational science

    Research period： 2021.6 - Present

  • Research theme： Electrode design of Fluoride shuttle battery

    Keyword： Computational science

    Research period： 2021.6 - Present

Awards

  • 日本金属学会功績賞

    2023.3   日本金属学会   受賞者は，電子論に基づく第一原理計算を状態図計算へ援用することで、新しい構造材料・機能性材料の設計方法について研究を進めてきた。これまでに、長周期積層構造を有するマグネシウム合金の形成メカニズムに関する研究や、鉄鋼における水素／マルテンサイト変態相互についての研究で、インパクトのある業績を挙げてきた。今後も計算科学的な見地からの機能発現メカニズムの解明、また太陽電池材料・熱電材料などの新材料開発に向けた研究の展開が期待される。

  • ベストポスターセッション賞

    2018.6   Grand Renewable Energy 2018  

Papers

  • The effective thermal conductivity of a screen-printed thermoelectric film of and

    Miyazaki, K; Mustafa, A; Baranwal, AK; Saini, S; Watanabe, K; Miura, A; Yabuki, T; Ishimaru, M; Kawano, S; Wang, Q; Iikubo, S; Shen, Q; Hayase, S

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   250   2025.11   （ ISSN:0017-9310 eISSN:1879-2189 ）

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    Publisher：International Journal of Heat and Mass Transfer  

    In recent years, printed thermoelectric thin films have attracted attention due to their advantages in enabling large-area and flexible designs. We developed printable thermoelectric composites of bismuth telluride and halide perovskite, which were expected to exhibit superior thermoelectric properties compared to other printable materials, such as conductive organic materials. The measured dimensionless figure of merit was about 0.1 at room temperature due to its low thermal conductivity. We assessed the interfacial thermal resistance between bismuth telluride and halide perovskite using multilayered films to understand the measured low thermal conductivity. The calculated thermal conductivity using the measured interfacial thermal resistance was fairly consistent with the effective thermal conductivity observed. We also discussed the interfacial thermal resistance using a phonon transport model based on ab-initio calculations to confirm the validity of our measurements. Additionally, we found that the high interfacial thermal resistance was achieved due to the low group velocities of both materials in the composites. This mechanism can be applied not only to improve thermoelectric materials but also to address thermal issues in composites.

    DOI： 10.1016/j.ijheatmasstransfer.2025.127292

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  • Overview of Hydrogen Effects on γ−ε Martensitic Transformation in Steels

    Koyama Motomichi, Iikubo Satoshi, Varanasi Rama Srinivas

    Tetsu-to-Hagane   111 ( 8 )   379 - 390   2025.6   （ ISSN:00211575 eISSN:18832954 ）

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    Language：Japanese   Publisher：The Iron and Steel Institute of Japan  

    <p>This paper presents an overview of our recent works on the effects of hydrogen on γ–ε martensitic transformations in steels. The study first discusses how hydrogen impacts these transformations. While hydrogen suppresses thermally-induced γ–ε martensitic transformation, it increases the fraction and number density of deformation-induced ε–martensite and decreases its thickness. Secondly, we discuss the effects of γ–ε martensitic transformations on hydrogen kinetics. The study also highlights the significance of low hydrogen diffusivity in the hexagonal-close-packed (HCP) lattice of pure iron, demonstrating the effectiveness of ε–martensite in resisting hydrogen. Moreover, the characteristic behavior of the HCP phase-related diffusionless transformation from a hydride is discussed. We believe that this overview will assist in developing hydrogen-resistant steels and in exploring new microstructural control concepts using hydrogen.</p>

    DOI： 10.2355/tetsutohagane.tetsu-2025-007

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  • Dissolution Behavior of the Cu-2.0 wt% Be Alloy (Alloy 25) in Molten Sn, Sn-3.0 wt% Ag-0.5 wt% Cu, and Sn-58 wt% Bi Lead-free Solders

    Yen, YW; Laksono, AD; Liang, CL; Hsu, CM; Pan, SC; Iikubo, S

    JOM   77 ( 6 )   4192 - 4205   2025.6   （ ISSN:1047-4838 eISSN:1543-1851 ）

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    This study investigated the dissolution behavior of Cu-2.0 wt% Be alloy (Alloy 25) in molten Sn, Sn-3.0 wt% Ag-0.5 wt% Cu (SAC), and Sn-58 wt% Bi (SB) lead-free solders at 240 °C, 270 °C, and 300 °C for 5–100 min. The dissolution rate of Alloy 25 in each molten solder system increased with the soldering temperature. The sequence of dissolution rates was as follows: Sn > SAC > SB. In addition, first-principles calculation revealed that adding Be to Cu makes it more difficult for Cu to incorporate into the Sn bulk. Notably, the linear C1–C2 path where the transition occurs directly between two adjacent lattice sites exhibits the lowest diffusion energy barrier for Be (0.24 eV), which increases to 0.48 eV in the presence of Bi. The Cu<inf>6</inf>Sn<inf>5</inf> phase, with minor solubility of the Be atom, was formed at all solder/Alloy 25 interfaces. In the SAC/Alloy 25 system, the Ag<inf>3</inf>Sn phase precipitated within the Cu<inf>6</inf>Sn<inf>5</inf> grains, decreasing the dissolution rate of Alloy 25 in the molten SAC solder. Notably, a Cu<inf>6</inf>Sn<inf>5</inf>/liquid/Cu<inf>6</inf>Sn<inf>5</inf> structure was observed in the SB/Alloy 25 system. The formation of a liquid phase at the SB/Alloy 25 interface effectively reduced the dissolution rate of Alloy 25.

    DOI： 10.1007/s11837-025-07324-z

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  • Optimization of Band Alignment by Organic Molecules for Perovskite Solar Cells

    Sekiguchi, N; Tsuji, Y; Truong, MA; Wakamiya, A; Iikubo, S

    JOURNAL OF PHYSICAL CHEMISTRY C   129 ( 18 )   8500 - 8508   2025.4   （ ISSN:1932-7447 eISSN:1932-7455 ）

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    Publisher：Journal of Physical Chemistry C  

    A methodology for optimization of band alignment in perovskite solar cells using organic molecule adsorption is investigated by using first-principles calculations. We focused on the modification of the work function after the adsorption of hole-collecting monolayer (HCM) materials bearing alkyl phosphonic acid anchoring groups on indium tin oxide (ITO), a transparent electrode substrate. The optimized structures of adsorbed HCM molecules and the ITO surface were obtained, and then the modification of the work function due to the influence of the electric double layer was determined. The calculated results show that the face-on oriented tripodal triazatruxene derivative (3PATAT-C3) has a better energy level tunability and higher stability than the edge-on oriented monopodal carbazole-based 2PACz, which is well-known as one of the representative HCM materials, and explain the advantage of 3PATAT-C3 for perovskite solar cells with a higher power conversion efficiency.

    DOI： 10.1021/acs.jpcc.4c08776

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  • Tetrapodal Hole-Collecting Monolayer Materials Based on Saddle-Like Cyclooctatetraene Core for Inverted Perovskite Solar Cells

    Truong, MA; Ueberricke, L; Funasaki, T; Adachi, Y; Hira, S; Hu, SF; Yamada, T; Sekiguchi, N; Nakamura, T; Murdey, R; Iikubo, S; Kanemitsu, Y; Wakamiya, A

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   63 ( 46 )   e202412939   2024.11   （ ISSN:14337851 eISSN:1521-3773 ）

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    Language：English   Publisher：Angewandte Chemie International Edition  

    Hole-collecting monolayers have greatly advanced the development of positive-intrinsic-negative perovskite solar cells (p-i-n PSCs). To date, however, most of the anchoring groups in the reported monolayer materials are designed to bind to the transparent conductive oxide (TCO) surface, resulting in less availability for other functions such as tuning the wettability of the monolayer surface. In this work, we developed two anchorable molecules, 4PATTI-C3 and 4PATTI-C4, by employing a saddle-like indole-fused cyclooctatetraene as a π-core with four phosphonic acid anchoring groups linked through propyl or butyl chains. Both molecules form monolayers on TCO substrates. Thanks to the saddle shape of a cyclooctatetraene skeleton, two of the four phosphonic acid anchoring groups were found to point upward, resulting in hydrophilic surfaces. Compared to the devices using 4PATTI-C4 as the hole-collecting monolayer, 4PATTI-C3-based devices exhibit a faster hole-collection process, leading to higher power conversion efficiencies of up to 21.7 % and 21.4 % for a mini-cell (0.1 cm<sup>2</sup>) and a mini-module (1.62 cm<sup>2</sup>), respectively, together with good operational stability. This work represents how structural modification of multipodal molecules could substantially modulate the functions of the hole-collecting monolayers after being adsorbed onto TCO substrates.

    DOI： 10.1002/anie.202412939

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  • Discovery of a giant lattice in Mg97Zn1Yb2 alloy

    Masafumi Matsushita, Atsuki Yokota, Daiki Yamasaki, Shinichiro Hiraoka, Kazuo Morikawa, Satoshi Iikubo, Michiaki Yamasaki, Yoshihito Kawamura

    Materials Today Communications   40   109883 - 109883   2024.8   （ ISSN:2352-4928 eISSN:2352-4928 ）

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    The Mg-rich corner of Mg–metal (M)–rare earth element (REE) ternary systems results in a long-period stacking-ordered (LPSO) phase that increases the strength and elongation of the Mg alloy. Using Yb at the REE position does not result in the LPSO phase; instead, it forms unique crystalline structures with intriguing properties. In this study, we found a new giant lattice belonging to the P6/mmc space group by quenching the Mg<inf>97</inf>Zn<inf>1</inf>Yb<inf>2</inf> alloy at 723 K. The giant lattice, which precipitates around the α-Mg matrix with a chemical composition of Mg<inf>75</inf>Zn<inf>7</inf>Yb<inf>18</inf> (at%), comprises a basic structure and a superlattice. We developed an atomic configuration model that expresses the basic structure as alternating stacking of three types of layers. The observed features indicate that the structure of the giant lattice is similar to that of the approximant quasicrystal reported for Mg–M–REE ternary systems.

    DOI： 10.1016/j.mtcomm.2024.109883

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  • Overview of Hydrogen Effects on <i>γ</i>−<i>ε</i> Martensitic Transformation in Steels

    Koyama Motomichi, Iikubo Satoshi, Varanasi Rama Srinivas

    ISIJ International   64 ( 4 )   732 - 741   2024.2   （ ISSN:09151559 eISSN:13475460 ）

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    Language：English   Publisher：The Iron and Steel Institute of Japan  

    <p>This paper presents an overview of our recent works on the effects of hydrogen on <i>γ</i>-<i>ε</i> martensitic transformations in steels. The study first discusses how hydrogen impacts these transformations. While hydrogen suppresses thermally-induced <i>γ</i>–<i>ε</i> martensitic transformation, it increases the fraction and number density of deformation-induced <i>ε</i>-martensite and decreases its thickness. Secondly, we discuss the effects of <i>γ</i>–<i>ε</i> martensitic transformations on hydrogen kinetics. The study also highlights the significance of low hydrogen diffusivity in the hexagonal-close-packed (HCP) lattice of pure iron, demonstrating the effectiveness of <i>ε</i>-martensite in resisting hydrogen. Moreover, the characteristic behavior of the HCP phase-related diffusionless transformation from a hydride is discussed. We believe that this overview will assist in developing hydrogen-resistant steels and in exploring new microstructural control concepts using hydrogen.</p>

    DOI： 10.2355/isijinternational.isijint-2023-243

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  • Formation process, microstructure, and mechanical properties of an ultrafine dual-phase alloy formed through phase transition of 18R-type long-period stacking ordered in Mg<inf>85</inf>Zn<inf>6</inf>Y<inf>9</inf> under high pressure

    Masafumi Matsushita, Yuki Kawabata, Yudai Nakata, Shinji Tanaka, Kohtaro Masuda, Daiki Yamauchi, Toru Shinmei, Yuji Higo, Michiaki Yamasaki, Yoshihito Kawamura, Satoshi Iikubo

    Journal of Alloys and Compounds   970   2024.1   （ ISSN:0925-8388 eISSN:1873-4669 ）

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    Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Journal of Alloys and Compounds  

    The 18R-type long-period stacking ordered (LPSO) structure in Mg85Zn6Y9 exhibits phase transition into D03 and α-Mg (D03/α-Mg) before it transforms into a liquid phase with the increase in temperature at 7.8 GPa. First-principles calculations suggest that the energy barrier between 18R-type LPSO and D03/α-Mg decreases with pressure. A further increase in the temperature decreases the energy difference between LPSO and D03/α-Mg. Therefore, the free energy variations due to the effects of both pressure and temperature cause phase transition. The D03/α-Mg phases formed at high pressure can be recovered at 0.1 MPa and room temperature. The phase transition from 18R-type LPSO structure to D03/α-Mg causes inner-grain diffusion and generates a lamellar structure. The thickness of the lamellar structure decreases with the increasing pressure until it reaches 65 nm at 15 GPa. Moreover, the alloy solidified above 5 GPa also comprises D03/α-Mg phases. The alloy solidified at 5 GPa exhibits a typical eutectic lamellar structure. However, spherulite-like polycrystalline microstructures containing ultrafine grains are obtained when the alloys are solidified at 10 and 15 GPa. The microstructure variations are caused by an increase in the degree of supercooling due to atomic diffusion suppression with the increasing pressure. The alloys containing D03/α-Mg exhibit both low modulus and ultrahigh strength. The Young's modulus is related to the presence of the D03 and α-Mg phases in the alloy structure. In contrast, the increase in σy can be attributed to the grain refinement strengthening.

    DOI： 10.1016/j.jallcom.2023.172457

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  • Enhanced Hot-Phonon Bottleneck Effect on Slowing Hot Carrier Cooling in Metal Halide Perovskite Quantum Dots With Alloyed A-Site. Reviewed International journal

    Hua Li, Qing Wang, Yusuke Oteki, Chao Ding, Dong Liu, Yao Guo, Yusheng Li, Yuyao Wei, Dandan Wang, Yongge Yang, Taizo Masuda, Mengmeng Chen, Zheng Zhang, Tomah Sogabe, Shuzi Hayase, Yoshitaka Okada, Satoshi Iikubo, Qing Shen

    Advanced materials (Deerfield Beach, Fla.)   35 ( 38 )   e2301834   2023.9   （ ISSN:0935-9648 eISSN:1521-4095 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Advanced Materials  

    A deep understanding of the effect of the A-site cation cross-exchange on the hot-carrier relaxation dynamics in perovskite quantum dots (PQDs) has profound implications on the further development of disruptive photovoltaic technologies. In this study, we investigated the hot carrier cooling kinetics of pure FAPbI3 , MAPbI3 , CsPbI3 and alloyed FA0.5 MA0.5 PbI3 , FA0.5 Cs0.5 PbI3 , and MA0.5 Cs0.5 PbI3 QDs using ultrafast transient absorption (TA) spectroscopy. The lifetimes of the initial fast cooling stage (<1 ps) of all the organic cation-containing PQDs were shorter than those of the CsPbI3 QDs, as verified by the electron-phonon coupling strength extracted from the temperature-dependent photoluminescence spectra. The lifetimes of the slow cooling stage of the alloyed PQDs were longer under illumination greater than 1 sun, which was ascribed to the introduction of co-vibrational optical phonon modes in the alloyed PQDs. This facilitated efficient acoustic phonon upconversion and enhanced the hot-phonon bottleneck effect, as demonstrated by first-principles calculations. This article is protected by copyright. All rights reserved.

    DOI： 10.1002/adma.202301834

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  • Enhanced Hot‐Phonon Bottleneck Effect on Slowing Hot Carrier Cooling in Metal Halide Perovskite Quantum Dots With Alloyed A‐Site Reviewed

    H. Li, Q. Wang, Y. Oteki, C. Ding, D. Liu, Y. Guo, Y. Li, Y. Wei, D. Wang, Y. Yang, T. Masuda, M. Chen, Z. Zhang, T. Sogabe, S. Hayase, Y. Okada, S. Iikubo, Q. Shen

    Advanced Materials   2023.9

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Tripodal Triazatruxene Derivative as a Face-On Oriented Hole-Collecting Monolayer for Efficient and Stable Inverted Perovskite Solar Cells

    Truong, MA; Funasaki, T; Ueberricke, L; Nojo, W; Murdey, R; Yamada, T; Hu, SF; Akatsuka, A; Sekiguchi, N; Hira, S; Xie, LL; Nakamura, T; Shioya, N; Kan, D; Tsuji, Y; Iikubo, S; Yoshida, H; Shimakawa, Y; Hasegawa, T; Kanemitsu, Y; Suzuki, T; Wakamiya, A

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   145 ( 13 )   7528 - 7539   2023.3   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publisher：Journal of the American Chemical Society  

    Hole-collecting monolayers have drawn attention in perovskite solar cell research due to their ease of processing, high performance, and good durability. Since molecules in the hole-collecting monolayer are typically composed of functionalized π-conjugated structures, hole extraction is expected to be more efficient when the π-cores are oriented face-on with respect to the adjacent surfaces. However, strategies for reliably controlling the molecular orientation in monolayers remain elusive. In this work, multiple phosphonic acid anchoring groups were used to control the molecular orientation of a series of triazatruxene derivatives chemisorbed on a transparent conducting oxide electrode surface. Using infrared reflection absorption spectroscopy and metastable atom electron spectroscopy, we found that multipodal derivatives align face-on to the electrode surface, while the monopodal counterpart adopts a more tilted configuration. The face-on orientation was found to facilitate hole extraction, leading to inverted perovskite solar cells with enhanced stability and high-power conversion efficiencies up to 23.0%.

    DOI： 10.1021/jacs.3c00805

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  • Tripodal Triazatruxene Derivative as a Face-On Oriented Hole-Collecting Monolayer for Efficient and Stable Inverted Perovskite Solar Cells Reviewed

    M. A. Truong, T. Funasaki, L. Ueberricke, W. Nojo, R. Murdey, T. Yamada, S. Hu, A. Akatsuka, N. Sekiguchi, S. Hira, L. Xie, T. Nakamura, N. Shioya, D. Kan, Y. Tsuji, S. Iikubo, H. Yoshida, Y. Shimakawa, T. Hasegawa, Y. Kanemitsu, T. Suzuki, A. Wakamiya

    Journal of the American Chemical Society   145 ( 13 )   7528 - 7539   2023.3

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  • Overview of hydrogen effects on γ− ε martensitic transformation in steels Reviewed

    M. Koyama, S. Iikubo, R.S. Varanasi

    ISIJ International   2023.3

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Microstructure control and its observation of rapid solidification Cu-La alloy for the development of fluoride-ion batteries

    Zhu, S; Akamine, H; Nagahata, Y; Tojigamori, T; Miki, H; Zhang, Y; Tokunaga, T; Iikubo, S

    JOURNAL OF ALLOYS AND COMPOUNDS   930   2023.1   （ ISSN:0925-8388 eISSN:1873-4669 ）

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    Publisher：Journal of Alloys and Compounds  

    We report on the microstructure of Cu-La alloys, which is a candidate material for the electrode of fluoride-ion battery, prepared by the rapid solidification method. The Cu-La alloys near eutectic point (24.5at%La) were quenched at different cooling speed to obtain optimized lamellar microstructure. The cross-section of the Cu-24.5at%La alloy exhibited a lamellar microstructure, in which the Cu-rich and La-rich phases were well proportioned. A hexagonal Cu<inf>5</inf>La phase with a space group P6/mmm was confirmed in the Cu-enriched areas, along with tetragonal Cu<inf>4</inf>La particles with an I4̅m2 and hexagonal Cu<inf>2</inf>La with the P6/mmm. Furthermore, different cooling rate during solidification were applied by changing the wheel rotation speed of the device. The higher the rotation speed, the faster the cooling rate, and the finer the microstructure. The width of each layer in the microstructure was approximately 100 nm.

    DOI： 10.1016/j.jallcom.2022.167447

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  • Electronic structure and thermal conductance of the MASnI3/Bi2Te3 interface: a first-principles study Reviewed International journal

    Masayuki Morimoto, Shoya Kawano, Shotaro Miyamoto, Koji Miyazaki, Shuzi Hayase, Satoshi Iikubo

    Scientific Reports   12 ( 1 )   217 - 217   2022.12   （ ISSN:2045-2322 eISSN:2045-2322 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    <title>Abstract</title>To develop high-performance thermoelectric devices that can be created using printing technology, the interface of a composite material composed of MASnI<sub>3</sub> and Bi<sub>2</sub>Te<sub>3</sub>, which individually show excellent thermoelectric performance, was studied based on first-principles calculations. The structural stability, electronic state, and interfacial thermal conductance of the interface between Bi<sub>2</sub>Te<sub>3</sub> and MASnI<sub>3</sub> were evaluated. Among the interface structure models, we found stable interface structures and revealed their specific electronic states. Around the Fermi energy, the interface structures with Te<sup>II</sup> and Bi terminations exhibited interface levels attributed to the overlapping electron densities for Bi<sub>2</sub>Te<sub>3</sub> and MASnI<sub>3</sub> at the interface. Calculation of the interfacial thermal conductance using the diffuse mismatch model suggested that construction of the interface between Bi<sub>2</sub>Te<sub>3</sub> and MASnI<sub>3</sub> could reduce the thermal conductivity. The obtained value was similar to the experimental value for the inorganic/organic interface.

    DOI： 10.1038/s41598-021-04234-3

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    Other Link： https://www.nature.com/articles/s41598-021-04234-3

  • Microstructure control and its observation of rapid solidification Cu–La alloy for the development of fluoride-ion batteries Reviewed

    S. Zhu, H. Akamine, Y. Nagahata, T. Tojigamori, H. Miki, Y. Zhang, T. Tokunaga, S. Iikubo

    Journal of Alloys and Compounds   930 ( 5 )   2022.10

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  • Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells

    Kamarudin M.A., Sahamir S.R., Nishimura K., Iikubo S., Yoshino K., Minemoto T., Shen Q., Hayase S.

    ACS Materials Letters   4 ( 9 )   1855 - 1862   2022.9

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    Publisher：ACS Materials Letters  

    Lead-free perovskite solar cells have attracted attention to many in the field of perovskite research due to environmental concern over toxic materials and standards compliance. Tin-based perovskite materials have been selected as the ideal alternative to lead-based perovskite due to their similar optoelectronic properties. However, the performance of tin perovskite solar cells is still much lower than their lead perovskite counterparts. Various strategies have been introduced in order to enhance the efficiency of tin perovskite solar cells. In this research, A-site cation substitution has been performed using dimethylammonium cation (DMA+) in the form of dimethylammonium iodide (DMAI) salt. An optimized concentration of DMAI enhanced the performance of tin perovskite solar cells to a more than 10% boosted higher open-circuit voltage (VOC). A better surface morphology was obtained with DMA+ substitution. From Mott-Schottky measurements, a higher built-in potential has been obtained, which helped with charge carrier extraction. Furthermore, from X-ray photoelectron spectroscopy measurements, tin oxidation has been suppressed, leading to low hole carrier density. This work provides evidence that controlling the charge carrier density in tin-based perovskite solar cells is important to fabricating high performance devices.

    DOI： 10.1021/acsmaterialslett.2c00275

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  • Structural and thermoelectric properties of CH<sub>3</sub>NH<sub>3</sub>SnI<sub>3</sub> perovskites processed by applying high pressure with shear strain

    Wang, Q; Tang, YP; Horita, ZJ; Iikubo, S

    MATERIALS RESEARCH LETTERS   10 ( 8 )   521 - 529   2022.8   （ ISSN:2166-3831 ）

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    Publisher：Materials Research Letters  

    CH<inf>3</inf>NH<inf>3</inf>SnI<inf>3</inf> perovskites, which can be created using printing technology, are environmentally friendly thermoelectric materials, but their applications are limited by unsatisfactory thermoelectric efficiency and structural stability. In this work, CH<inf>3</inf>NH<inf>3</inf>SnI<inf>3</inf> perovskites are processed by applying high pressure with shear strain for the first time, resulting in better structural stability, enhanced electrical conductivity and the Seebeck coefficient with CH<inf>3</inf>NH<inf>3</inf>SnI<inf>3</inf> tube structures after processing. First-principles calculations verified the reasonable changes in lattice constants, electronic band structures, electrical conductivity and the Seebeck coefficient. The present study demonstrates a potential strategy to improve the structural and thermoelectric properties of CH<inf>3</inf>NH<inf>3</inf>SnI<inf>3</inf> and uncovers the possible mechanism.

    DOI： 10.1080/21663831.2022.2057821

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  • Unveiling the Role of the Metal Oxide/Sn Perovskite Interface Leading to Low Efficiency of Sn-Perovskite Solar Cells but Providing High Thermoelectric Properties Reviewed

    Ajay Kumar Baranwal, Shrikant Saini, Yoshitaka Sanehira, Gaurav Kapil, Muhammad Akmal Kamarudin, Chao Ding, Shahrir Razey Sahamir, Tomohide Yabuki, Satoshi Iikubo, Qing Shen, Koji Miyazaki, Shuzi Hayase

    ACS Applied Energy Materials   5 ( 8 )   9750 - 9758   2022.8   （ ISSN:2574-0962 eISSN:2574-0962 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACS Applied Energy Materials  

    Tin halide perovskites (THPs) have appealing optoelectronic properties similar to lead halide perovskites (LHPs). However, THPs coated on metal oxide electrodes in normal-structure perovskite solar cells exhibit poor diode rectification, resulting in poor efficiency. This poor photoelectric performance in n-i-p-based THP solar cells is in contrast with LHP solar cells. We report that this deficient performance of THP solar cells is triggered by the defect states of the metal oxide layer. The defect states of the metal oxide can trap the electrons from the THP, leading to the prompt formation of Sn(IV), which will increase the carrier density and lead to poor photoelectric performance. This observation was supported by the ultraviolet-photoelectron spectroscopic measurements of inorganic thin films Al2O3, SnO2, TiO2, ZnO, and ZrO2. However, this self-doping phenomenon resulting in the increase in carrier density can be applied to thermoelectric studies. Using CsSnI3/ZrO2 nanocomposites as thermoelectric active layers, we report a power factor of 186.58 μW/mK2 measured at room temperature, which is better than the 148.61 μW/mK2 of the original CsSnI3 thin film.

    DOI： 10.1021/acsaem.2c01437

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  • Influence of charge transport layer on the crystallinity and charge extraction of pure tin-based halide perovskite film

    Yaohong Zhang, Muhammad Akmal Kamarudin, Qiao Li, Chao Ding, Yong Zhou, Yingfang Yao, Zhigang Zou, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase, Qing Shen

    JOURNAL OF ENERGY CHEMISTRY   69   612 - 615   2022.6   （ ISSN:2095-4956 ）

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    Tin-based halide perovskite have emerged as a promising alternative to toxic lead-based halide perovskite for next generation photovoltaic device. In order to reveal the effect of charge transport layers (CTLs) on the crystallinity and charge extraction of tin-based halide perovskite film, here we employ different electron transport materials and hole transport materials as CTLs used for perovskite film growth. The tin-based halide perovskite films grown on organic CTLs exhibit better crystallization, lower lattice strain and have less defect states than those grown on inorganic CTLs, and photogenerated hole seems easier to be extracted than electrons in tin-based halide perovskite films. The former one can explain very well why the inverted structure tin-based perovskite solar cells show much higher power conversion efficiency (PCE) compared to the regular structure device. The later one suggests balanced electron and hole extraction are needed for enhancing the photovoltaic performance of the tin-based perovskite solar cell. Furthermore, the carrier extraction rate at CTLs/perovskite interface not only depends on the band offset of the CTLs/perovskite interface but also can be affected by the free energy of coulombic interaction at the interface. These finding would shed light on the further improvement of tin-based perovskite solar cells.

    DOI： 10.1016/j.jechem.2022.02.003

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  • The Effect of Increasing Nickel Content on the Microstructure, Hardness, and Corrosion Resistance of the CuFeTiZrNi<i><sub>x</sub></i> High-Entropy Alloys

    Kuo, PC; Chen, SY; Yu, W; Okumura, R; Iikubo, S; Laksono, AD; Yen, YW; Pasana, AS

    MATERIALS   15 ( 9 )   2022.5   （ ISSN:1996-1944 eISSN:1996-1944 ）

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    In recent years, high-entropy alloys (HEAs) that contain fine grains of intermetallic compounds (IMCs) have gained increasing attention as they have been shown to exhibit both high mechanical strength and strong corrosion resistance. One such class of HEAs is that of CuFeTiZrNi alloys. In this study, we have investigated the effect of increasing Ni content on the microstructure, hardness, and corrosion resistance of the CuFeTiZrNi<inf>x</inf> alloys (where x = 0.1, 0.3, 0.5, 0.8, 1.0 in a molar ratio). The alloys used in this study were prepared in an arc melting furnace and then annealed at 900<sup>◦</sup> C. First-principles calculations of the bulk modulus were also performed for each alloy. The results revealed that increasing the Ni content had several effects. Firstly, the microstructure of the CuFeTiZrNi<inf>x</inf> alloys changed from B2_BCC and Laves_C14 in the CuFeTiZrNi<inf>0.1</inf> and CuFeTiZrNi<inf>0.3</inf> alloys to FCC, B2_BCC, and Laves_C14 in the CuFeTiZrNi<inf>0.5</inf> alloys; and to FCC, B2_BCC, Cu<inf>51</inf> Zr<inf>14</inf>, and Laves_C14 in the CuFeTiZrNi<inf>0.8</inf> and CuFeTiZrNi<inf>1.0</inf> alloys. Secondly, IMCs arising from a combination of the refractory elements (Ti and Zr) and atomic size differences were found in the interdendritic region. Thirdly, as the Ni content in the CuFeTiZrNi<inf>x</inf> alloys increased, the hardness decreased, but the corrosion resistance increased.

    DOI： 10.3390/ma15093098

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  • Relationship between Carrier Density and Precursor Solution Stirring for Lead-Free Tin Halide Perovskite Solar Cells Performance Reviewed

    Ajay Kumar Baranwal, Kohei Nishimura, Dong Liu, Muhammad Akmal Kamarudin, Gaurav Kapil, Shrikant Saini, Tomohide Yabuki, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Koji Miyazaki, Qing Shen, Shuzi Hayase

    ACS Applied Energy Materials   5 ( 4 )   4002 - 4007   2022.4   （ eISSN:2574-0962 ）

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    The oxidation of tin halide perovskite precursor (THP) with the solvent dimethyl sulfoxide (DMSO) has intriguing drawbacks. We found that THP oxidation under progressive stirring can be hindered by the addition of GeI<inf>2</inf>. Subsequently, the stirring time of the precursor solution affects the carrier density and semiconducting properties of fabricated films, because DMSO can increase the oxidation induced carrier density. On the other hand, dimethylformamide (DMF) can suppress the oxidation induced carrier density. After 24 h, an efficiency of 10.26% is found when DMF is used and 7.12% is found when DMSO is used as a stirring solvent.

    DOI： 10.1021/acsaem.1c03622

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  • Structural stability and optical properties of tin-based iodide perovskite

    Ide A., Iikubo S., Yamamoto K., Shen Q., Yoshino K., Minemoto T., Hayase S.

    Japanese Journal of Applied Physics   61 ( 3 )   2022.3   （ ISSN:00214922 ）

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    In this study, we investigated the optical properties, band gap, dielectric function and absorption coefficient of Sn-based perovskites, which are considered as potential candidates for Pb-free perovskite solar cells. In addition, the quantum efficiency of the perovskite solar cell was investigated, and the values were compared with the experimental values. Furthermore, as an element that suppresses Sn vacancy formation, we focused on the B site of MASnI3 and investigated the vacancy formation energy by substituting various elements. The absorption coefficient was calculated to investigate the effects on the optical characteristics of an additive element that suppresses Sn vacancies.

    DOI： 10.35848/1347-4065/ac4050

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  • Phase transformations in Al-Ti-Mg powders consolidated by high-pressure torsion: Experiments and first-principles calculations Reviewed

    Yongpeng Tang, Mitsuhiro Murayama, Kaveh Edalati, Qing Wang, Satoshi Iikubo, Takahiro Masuda, Yuji Higo, Yoshinori Tange, Yasuo Ohishi, Masaki Mito, Zenji Horita

    Journal of Alloys and Compounds   889   2022.1   （ ISSN:0925-8388 ）

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    A powder mixture of Al-Ti-Mg with an equal atomic fraction was subjected to severe plastic deformation using high-pressure torsion (HPT) under 6 GPa at room temperature for full consolidation. Microstructural evolution with respect to straining and annealing was examined by X-ray diffraction (XRD) analysis and high-resolution transmission electron microscopy. The XRD analysis revealed that Ti prevails in the consolidated sample and a phase transformation occurs from α phase to ω phase during HPT processing while the total fraction of the ω phase increases with straining. Grain refinement to ~100 nm was achieved through the HPT processing for 100 revolutions as well as the formation of nanograined intermetallics such as Al<inf>3</inf>Ti, AlTi<inf>3</inf> and TiAl. The hardness gradually increases with straining, and further increases by annealing at 573 K for 1.5 h due to the formation of an Al<inf>12</inf>Mg<inf>17</inf> phase despite the fact that the harder ω phase was reversely-transformed to the softer α phase and grains were coarsened to ~450 nm. First-principles calculations show that Al and Mg elements are dissolved into the ω − Ti during HPT processing.

    DOI： 10.1016/j.jallcom.2021.161815

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  • Effect of Halogen Ions on the Low Thermal Conductivity of Cesium Halide Perovskite Reviewed

    Shoya Kawano, Terumasa Tadano, Satoshi Iikubo

    Journal of Physical Chemistry C   125 ( 1 )   91 - 97   2021.1

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    DOI： 10.1021/acs.jpcc.0c08324

  • Structural stability and electronic property evaluations for different Bi2Te3 (0 0 1) termination surfaces Reviewed

    Masayuki Morimoto, Shoya Kawano, Koji Miyazaki, Satoshi Iikubo

    Applied Surface Science   525   146454 - 146454   2020.9

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    DOI： 10.1016/j.apsusc.2020.146454

  • Lead-free tin-halide perovskite solar cells with 13% efficiency Reviewed

    Kohei Nishimura, Muhammad Akmal Kamarudin, Daisuke Hirotani, Kengo Hamada, Qing Shen, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

    Nano Energy   74   104858 - 104858   2020.8

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    DOI： 10.1016/j.nanoen.2020.104858

  • Pb-free Sn perovskite solar cells doped with samarium iodide Reviewed

    Hamada K., Hirotani D., Kamarudin M., Nishimura K., Shen Q., Iikubo S., Minemoto T., Yoshino K., Toyoda T., Hayase S

    ACS Applied Materials and Interfaces   2020.4

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  • Enhanced Device Performance with Passivation of the TiO2 Surface Using a Carboxylic Acid Fullerene Monolayer for a SnPb Perovskite Solar Cell with a Normal Planar Structure. Reviewed International journal

    Kengo Hamada, Ryo Tanaka, Muhammad Akmal Kamarudin, Qing Shen, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Taro Toyoda, Tingli Ma, Dong-Won Kang, Shuzi Hayase

    ACS applied materials & interfaces   12 ( 15 )   17776 - 17782   2020.4

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    DOI： 10.1021/acsami.0c01411

  • Interface engineering using Y<inf>2</inf>O<inf>3</inf> scaffold to enhance the thermoelectric performance of CsSnI<inf>3</inf> thin film Reviewed

    Ajay Kumar Baranwal, Shrikant Saini, Zhen Wang, Daisuke Hirotani, Tomohide Yabuki, Satoshi Iikubo, Koji Miyazaki, Shuzi Hayase

    Organic Electronics   76   2020.1

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    DOI： 10.1016/j.orgel.2019.105488

  • Role of substituted atoms in stacking fault formation in long-period stacking ordered system Reviewed

    S. Kawano, S. Iikubo, H. Ohtani

    Computational Materials Science   171   2020.1

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    DOI： 10.1016/j.commatsci.2019.109210

  • Suppression of charge carrier recombination in lead-free tin halide perovskite via lewis base post-treatment Reviewed

    Muhammad Akmal Kamarudin, Daisuke Hirotani, Zhen Wang, Kengo Hamada, Kohei Nishimura, Qing Shen, Taro Toyoda, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

    Journal of Physical Chemistry Letters   10 ( 17 )   5277 - 5283   2019.9

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    DOI： 10.1021/acs.jpclett.9b02024

  • Relationship between Lattice Strain and Efficiency for Sn-Perovskite Solar Cells Reviewed

    Kohei Nishimura, Daisuke Hirotani, Muhammad Akmal Kamarudin, Qing Shen, Taro Toyoda, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

    ACS Applied Materials and Interfaces   11 ( 34 )   31105 - 31110   2019.8

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    DOI： 10.1021/acsami.9b09564

  • First-Principles Study of Chemical Driving Force for Face Centered Cubic to Hexagonal Close Packed Martensitic Transformation in Hydrogen-Charged Iron Reviewed

    Y. Kuroki, S. Kawano, S. Iikubo, H. Ohtani, M. Koyama, K. Tsuzaki

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50   3019 - 3023   2019.7

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    First-Principles Study of Chemical Driving Force for Face Centered Cubic to Hexagonal Close Packed Martensitic Transformation in Hydrogen-Charged Iron
    © 2019, The Minerals, Metals & Materials Society and ASM International. This study uses first-principles calculations to investigate the effect of hydrogen on the chemical driving force of the transformation of iron from the face centered cubic (FCC) to hexagonal close packed (HCP) phase. The minimum energy path from FCC to HCP phases shows that FCC becomes stable with increasing hydrogen content. Furthermore, the energy difference between the FCC and HCP phases is observed to be smaller in Fe2H than in Fe throughout the temperature region. These results clearly explain the observed anomalous suppression of the martensitic transformation in the hydrogen-charged steel.

    DOI： 10.1007/s11661-019-05237-6

  • Experimental and Theoretical Elucidation of Electrochemical CO <inf>2</inf> Reduction on an Electrodeposited Cu <inf>3</inf> Sn Alloy Reviewed

    Masayuki Morimoto, Yoshiyuki Takatsuji, Satoshi Iikubo, Shoya Kawano, Tatsuya Sakakura, Tetsuya Haruyama

    Journal of Physical Chemistry C   123 ( 5 )   3004 - 3010   2019.2

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    DOI： 10.1021/acs.jpcc.8b11431

  • Key factor for the transformation from Hcp to 18R-type long-period stacking ordered structure in Mg alloys Reviewed

    Masafumi Matsushita, Takafumi Nagata, Jozef Bednarcik, Norimasa Nishiyama, Shoya Kawano, Satoshi Iikubo, Yuji Kubota, Ryo Morishita, Tetsuo Irifune, Michiaki Yamasaki, Yoshihito Kawamura, Masanori Enoki, Hiroshi Ohtani

    Materials Transactions   60   237 - 245   2019.1

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    Key factor for the transformation from Hcp to 18R-type long-period stacking ordered structure in Mg alloys
    ©2018 The Japan Institute of Metals and Materials. Cast Mg 85 Y 9 Zn 6 has an 18R-type LPSO structure. However, Mg 85 Y 9 Zn 6 recovered after being subjected to a loading pressure of 7 GPa at 973 K shows a fine dual-phase structure composed of a face-centered cubic (fcc) structure showing a superlattice (D0 3 ), as well as a hexagonal close-packed structure (hcp:2H). The D0 3 /hcp structure transformed to 18R-type LPSO during heating at ambient pressure. In this research, the transformation process from the D0 3 /hcp structure to 18R-type LPSO structure was discussed by means of in situ XRD and first-principles calculation. At first, lattice volume of 2H increased with an increase in the temperature, because of the Zn and Y emitted from the D0 3 phase into the 2H lattice. After the volume expansion of 2H lattice, the structure collapsed due to insert of random stacking faults (SFs). Then, a formation of 18R-type LPSO structure occurred. Based on a first-principles calculation for pure Mg, volume expansion of the 2H lattice causes the transformation to an 18R structure. Furthermore, the results of free energy calculations for the hcp and fcc structures in the MgYZn ternary system show that the segregation of Y and Zn atoms on SFs occurs by the Suzuki effect. These segregated Y and Zn atoms in SF layers, which have a local fcc structure, create a synergy between the stacking and chemical modulations. Present result insists that the volume increase of 2H lattice takes place first, and then the transformation from the hcp structure to 18R stacking occurs. [doi:10.2320/matertrans.M2018213]

    DOI： 10.2320/matertrans.M2018213

  • The effect of transparent conductive oxide substrate on the efficiency of snge-perovskite solar cells Reviewed

    Hamada K., Kamarudin M., Zhen W., Hirotani D., Shen Q., Iikubo S., Minemoto T., Yoshino K., Toyoda T., Hayase S

    Chemistry Letters   2019.1

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  • An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels Reviewed

    Motomichi Koyama, Kenji Hirata, Yuji Abe, Akihiro Mitsuda, Satoshi Iikubo, Kaneaki Tsuzaki

    Scientific Reports   8   2018.12

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    An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels
    © 2018, The Author(s). Iron and steels are extensively used as structural materials, and have three primary phase structures: Body-centered cubic (bcc), face-centered cubic (fcc), and hexagonal closed-packed (hcp). Controlling phase stabilities, especially by the use of interstitials, is a universal method that provides a diverse variety of functional and mechanical properties in steels. In this context, hydrogen, which can act as an interstitial species in steels, has been recognized to promote phase transformation from fcc to hcp. However, we here report a dramatic effect of interstitial hydrogen that suppresses this hcp phase transformation. More specifically, the fraction of hcp phase that forms during cooling decreases with increasing diffusible hydrogen content. This new finding opens new venues for thermodynamics-based microstructure design and for development of robust, strong, and ductile steels in hydrogen-related infrastructures.

    DOI： 10.1038/s41598-018-34542-0

  • First-principles study of electronic and optical properties of lead-free double perovskites Cs2NaBX6 (B = Sb, Bi; X = Cl, Br, I) Reviewed

    Shuai Zhao, Kumiko Yamamoto, Satoshi Iikubo, Shuzi Hayase, Tingli Ma

    Journal of Physics and Chemistry of Solids   117   117 - 121   2018.6

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    DOI： 10.1016/j.jpcs.2018.02.032

  • Mixed Sn–Ge Perovskite for Enhanced Perovskite Solar Cell Performance in Air Reviewed

    Nozomi Ito, Muhammad Akmal Kamarudin, Daisuke Hirotani, Yaohong Zhang, Qing Shen, Yuhei Ogomi, Satoshi Iikubo, Takashi Minemoto, Kenji Yoshino, Shuzi Hayase

    The Journal of Physical Chemistry Letters   9 ( 7 )   1682 - 1688   2018.4

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    DOI： 10.1021/acs.jpclett.8b00275

  • Phase equilibria of the Cu-Ni-Zr ternary systems at 800 °C and thermodynamic assessment and metallic glass region prediction for the Cu-Ni-Zr ternary system Reviewed

    Hermana G, Huang T, Chen C, Lin C, Iikubo S, Yen Y

    Journal of Non-Crystalline Solids   481   612 - 621   2018.2

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    Phase equilibria of the Cu-Ni-Zr ternary systems at 800 °C and thermodynamic assessment and metallic glass region prediction for the Cu-Ni-Zr ternary system
    Cu-Zr based alloys have been used as metallic glass alloys owing to their high glass forming ability (GFA). Ni is added into these alloys to enhance their mechanical property and improve GFA. These Cu-Ni-Zr ternary alloys have a high potential to be used as metallic glass alloys. Herein, we investigated and assessed thermodynamically the phase equilibria of the Cu-Ni-Zr ternary system at 800 °C using the calculation of phase diagram (CALPHAD) method based on the experimental data. Thirty-three alloys were prepared using the arc melting method. At 800 °C, the isothermal section of the Cu-Ni-Zr ternary system composed of 15 single-phase regions, 20 two-phase regions, and 8 three-phase regions
    no ternary intermetallic compounds were found. In addition, a continuous solid solution was formed by the Cu10Zr7 and Ni10 Zr7 phases at 800 °C. Furthermore, the thermodynamic parameters were optimized using the phase equilibrium data. The calculated isothermal section and metallic glass region prediction of the Cu-Ni-Zr ternary system were reasonable and satisfactory compared with the literature data.

    DOI： 10.1016/j.jnoncrysol.2017.12.016

  • Novel stable structure of Li<inf>3</inf>PS<inf>4</inf> predicted by evolutionary algorithm under high-pressure Reviewed

    S. Iikubo, K. Shimoyama, S. Kawano, M. Fujii, K. Yamamoto, M. Matsushita, T. Shinmei, Y. Higo, H. Ohtani

    AIP Advances   8 ( 1 )   2018.1

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    DOI： 10.1063/1.5011401

  • Structural Stability of Iodide Perovskite: A Combined Cluster Expansion Method and First-Principles Study Reviewed

    K. Yamamoto, S. Iikubo, J. Yamasaki, Y. Ogomi, S. Hayase

    Journal of Physical Chemistry C   121 ( 50 )   27797 - 27804   2017.12

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    DOI： 10.1021/acs.jpcc.7b07910

  • Thermodynamic assessment of Fe–Ti–S ternary phase diagram Reviewed

    Hirata K, Iikubo S, Fujimoto H, Ohtani H

    Calphad: Computer Coupling of Phase Diagrams and Thermochemistry   57   62 - 77   2017.6

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    Thermodynamic assessment of Fe-Ti-S ternary phase diagram
    A thermodynamic analysis of the Fe-Ti-S ternary system was performed by incorporating first-principles calculations into the calculation of phase diagrams (CALPHAD) method. To evaluate the Gibbs energy, the Debye-Griineisen model was applied for some sulfides of the Ti-S binary system. In addition, the cluster expansion and cluster variation methods were used for the solid solution phases in the Ti-S binary and (Fe,Ti)S phases. The calculated Ti-S binary phase diagram showed good agreement with the experimental results. The very low solubility of the Ti solid solution in the Ti-S system, as reported by Murray, agreed well with our calculated results. A binodal phase decomposition of the liquid phase was expected in the S-rich region. The Gibbs energy curve of (Fe,Ti)S between FeS and TiS was found to be convex downward. This is characteristic of an isomorphic solid solution, attributed to the attractive interaction between Fe and Ti in (Fe,Ti)S. The vertical phase diagram between FeS and TiS, obtained using the thermodynamic database, was in good agreement with the experimental results of Mitsui et al. The solubility products of (Fe,Ti)S have been experimentally estimated previously. The calculated solubility product agreed with the experimental value of TiS.

    DOI： 10.1016/j.calphad.2017.02.006

  • Molecular dynamics study of the diffusion behaviour of Li in Li<inf>10</inf>GeP<inf>2</inf>S<inf>12</inf> Reviewed

    S. Kawano, S. Iikubo

    Pertanika Journal of Science and Technology   25 ( 1 )   247 - 254   2017.1

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  • Facile Synthesis and Characterization of Sulfur Doped Low Bandgap Bismuth Based Perovskites by Soluble Precursor Route Reviewed

    Murugan Vigneshwaran, Takeshi Ohta, Satoshi Iikubo, Gaurav Kapil, Teresa S. Ripolles, Yuhei Ogomi, Ting Ma, Shyam S. Pandey, Qing Shen, Taro Toyoda, Kenji Yoshino, Takashi Minemoto, Shuzi Hayase

    CHEMISTRY OF MATERIALS   28 ( 18 )   6436 - 6440   2016.9

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    DOI： 10.1021/acs.chemmater.6b02315

  • Thermodynamic Analysis of Phase Equilibria in the Mn-Bi-Sb Ternary System Reviewed

    Manami Uemitsu, Masanori Enoki, Satoshi Iikubo, Hiroshi Ohtani

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   78 ( 9 )   327 - 336   2014.9

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    DOI： 10.2320/jinstmet.JAW201410

  • Thermodynamic Analysis on a Segregation Behavior of Alloying Elements to Stacking Faults in Mg-Y-Zn Based LPSO Structures Reviewed

    Tatsuki Umebayashi, Satoshi Iikubo, Hiroshi Ohtani

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   78 ( 3 )   117 - 125   2014.3

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    DOI： 10.2320/jinstmet.JBW201307

  • Deposition of hydroxyapatite on SiC nanotubes in simulated body fluid Reviewed

    Tomitsugu Taguchi, Toshiki Miyazaki, Satoshi Iikubo, Kenji Yamaguchi

    MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS   34 ( 1 )   29 - 34   2014.1

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    DOI： 10.1016/j.msec.2013.10.007

  • Ho-doping effect on the incommensurate magnetic order in La1.88Sr0.12CuO4 Reviewed

    Masaki Fujita, Masanori Enoki, Kenji Tsutsumi, Satoshi Iikubo, Kazuyoshi Yamada

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   62 ( 12 )   1840 - 1843   2013.7

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    DOI： 10.3938/jkps.62.1840

  • Thermodynamic Analysis of Phase Equilibria in the Mg-Al-Ho Ternary System Reviewed

    Tatsuya Tokunaga, Hironobu Kominato, Satoshi Iikubo, Hiroshi Ohtani

    MATERIALS TRANSACTIONS   54 ( 5 )   647 - 655   2013.5

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    DOI： 10.2320/matertrans.MI201226

  • Phase stability of long-period stacking structures in Mg-Y-Zn: A first-principles study Reviewed

    Satoshi Iikubo, Kensuke Matsuda, Hiroshi Ohtani

    PHYSICAL REVIEW B   86 ( 5 )   2012.8

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    DOI： 10.1103/PhysRevB.86.054105

  • Hidden Itinerant-Spin Phase in Heavily Overdoped La2-xSrxCuO4 Superconductors Revealed by Dilute Fe Doping: A Combined Neutron Scattering and Angle-Resolved Photoemission Study Reviewed

    Rui-Hua He, M. Fujita, M. Enoki, M. Hashimoto, S. Iikubo, S. -K. Mo, Hong Yao, T. Adachi, Y. Koike, Z. Hussain, Z. -X. Shen, K. Yamada

    PHYSICAL REVIEW LETTERS   107 ( 12 )   2011.9

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    DOI： 10.1103/PhysRevLett.107.127002

  • Thermodynamic Analysis of the Cu-Sn-P Ternary System Reviewed

    Masashi Hino, Satoshi Iikubo, Hiroshi Ohtani

    HIGH TEMPERATURE MATERIALS AND PROCESSES   30 ( 4-5 )   387 - 404   2011.8

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    DOI： 10.1515/HTMP.2011.061

  • 状態図計算法の最近の動向と今後の展望 Reviewed

    徳永 辰也, 飯久保 智, 大谷 博司

    Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan   127 ( 8 )   473 - 478   2011.7

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    Language：Japanese  

    Recent Trends and Future Perspectives of Phase Diagram Calculations
    The CALPHAD (Cal(/)-culations of Pha(/)-se D(/)-iagrams) method has succeeded in obtaining multicomponent phase diagrams for technological applications in the last few decades. However, this approach is faced with some difficulties in calculating phase equilibria in the metastable region and thermodynamic properties of metastable phases, those are usually not accessible experimentally. Within the same time frame, first-principles calculations based on the electron theory have progressed extensively and have interacted with the CALPHAD method. In this paper, after a brief overview of the history and the basics of the CALPHAD method, we present our recent research results on the calculations of thermodynamic properties such as enthalpy of formation at finite temperatures using electron theory as well as lattice vibration and cluster expansion method, with special emphasis on making use of these theoretical values in the CALPHAD description of thermodynamic properties of alloys.

    DOI： 10.2473/journalofmmij.127.473

  • Incommensurate Magnetic Excitation in Spin-Glass Phase of Bi2201 Cuprate Reviewed

    Masanori Enoki, Masaki Fujita, Satoshi Iikubo, John M. Tranquada, Kazuyoshi Yamada

    J Phys. Soc. Jpn   80   SB026   2011.5

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    Incommensurate Magnetic Excitation in Spin-Glass Phase of Bi2201 Cuprate
    Static and dynamic magnetic susceptibilities of lightly-doped Bi2.4Sr1.6CuO6+y were studied by a SQUID magnetometer and triple-axis neutron spectrometers. The static magnetic susceptibility showed a difference between field-cooled and zero-field-cooled processes at low temperature, showing a spin-glass-like behavior. The irreversibility temperature was determined to be T-sg similar to 3 K, which is slightly lower than T-sg of 5-6 K in the lightly-doped LSCO with similar hole concentration. Furthermore, we have confirmed the existence of low-energy spin fluctuations with the spatially modulated spin correlation along diagonal to Cu-O bond direction in the Bi2201 system for the first time. This observation is consistent with the previously reported result for the spin-glass phase of LSCO. The magnetic intensity chi ''(omega) measured at the energy transfer of 1 meV drastically developed below 100 K, while that at 6 meV shows a gradual increase below 200 K with decreasing the temperature. Although the spin fluctuations slow down upon cooling, no well defined static order was detected even at 6 K. Our results suggest that the diagonal incommensurate spin correlation is common in the spin-glass phase of single layer cuprate-oxide. The development of static component, however, is different between the Bi2201 and LSCO systems and would be affected by the interlayer coupling and/or the cation disorder on the A-site.

    DOI： 10.1143/JPSJS.80SB.SB026

  • Neutron scattering study of Fe(Se1-xTex)(0.92) (x=0.75, 1) Reviewed

    S. Iikubo, M. Fujita, S. Niitaka, H. Takagi, H. Ohtani, M. Hasebe

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470   S401 - S403   2010.12

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    DOI： 10.1016/j.physc.2009.10.135

  • Local crystal structure of nano-manganese-oxide gold adsorbent Reviewed

    Satoshi Iikubo, Hideki Koyanaka, Shin-ichi Shamoto, Ken Takeuchi, Shinji Kohara, Katsuaki Kodama, Chun-Keung Loong

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   71 ( 11 )   1603 - 1608   2010.11

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    DOI： 10.1016/j.jpcs.2010.08.011

  • Gradual development of Gamma(5g) antiferromagnetic moment in the giant negative thermal expansion material Mn3Cu1-xGexN (x similar to 0.5) Reviewed

    K. Kodama, S. Iikubo, K. Takenaka, M. Takigawa, H. Takagi, S. Shamoto

    PHYSICAL REVIEW B   81 ( 22 )   224419 - 224419   2010.6

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    DOI： 10.1103/PhysRevB.81.224419

  • First-Principles Calculations of the Specific Heats of Cubic Carbides and Nitrides Reviewed

    Satoshi Iikubo, Hiroshi Ohtani, Mitsuhiro Hasebe

    MATERIALS TRANSACTIONS   51 ( 3 )   574 - 577   2010.3

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    DOI： 10.2320/matertrans.MBW200913

  • Antiferromagnetic Fluctuations in Fe(Se1-xTex)(0.92) (x=0.75, 1) Observed by Inelastic Neutron Scattering Reviewed

    Satoshi Iikubo, Masaki Fujita, Seiji Niitaka, Hidenori Takagi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 10 )   103704 - 103704   2009.10

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    DOI： 10.1143/JPSJ.78.103704

  • Relationship between average and local crystal structure and the ferroelectric properties of a Sr-Bi-Ta-Si-O ferroelectric material Reviewed

    Yasushi Idemoto, Satoshi Taniyama, Satoshi Iikubo, Shin-ichi Shamoto, James W. Richardson

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   70 ( 8 )   1156 - 1165   2009.8

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    DOI： 10.1016/j.jpcs.2009.06.017

  • Antiferromagnetic bipolar semiconductor LaMnPO with ZrCuSiAs-type structure Reviewed

    Hiroshi Yanagi, Takumi Watanabe, Katsuaki Kodama, Satoshi Iikubo, Shin-ichi Shamoto, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

    JOURNAL OF APPLIED PHYSICS   105 ( 9 )   093916-093916   2009.5

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    DOI： 10.1063/1.3124582

  • Neutron-Scattering Study of Impurity Effect on Stripe Correlations in La-Based 214 High-Tc Cuprate Reviewed

    M. Fujita, M. Enoki, S. Iikubo, K. Yamada

    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM   22 ( 3 )   243 - 245   2009.4

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    DOI： 10.1007/s10948-008-0423-z

  • Total scattering of disordered crystalline functional materials Reviewed

    Shin-Ichi Shamoto, Katsuaki Kodama, Satoshi Iikubo, Tomitsugu Taguchi

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   600 ( 1 )   229 - 231   2009.2

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    DOI： 10.1016/j.nima.2008.11.035

  • Local Lattice Distortion in the Giant Negative Thermal Expansion Material Mn(3)Cu(1-x)Ge(x)N Reviewed

    S. Iikubo, K. Kodama, K. Takenaka, H. Takagi, M. Takigawa, S. Shamoto

    PHYSICAL REVIEW LETTERS   101 ( 20 )   205901 - 205901   2008.11

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    DOI： 10.1103/PhysRevLett.101.205901

  • Crystal structure and magnetic properties of CoZn(TeO3)Br-2 Reviewed

    Takafumi Kashi, Yukio Yasui, Taketo Moyoshi, Masatoshi Sato, Kazuhisa Kakurai, Satoshi Iikubo, Naoki Igawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 8 )   084707-084707   2008.8

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    DOI： 10.1143/JPSJ.77.084707

  • Neutron powder diffraction study on the crystal and magnetic structures of BiCrO3 Reviewed

    Belik Alexei A, Iikubo Satoshi, Kodama Katsuaki, Igawa Naoki, Shamoto Shinichi, Takayama-Muromachi Eiji

    CHEMISTRY OF MATERIALS   20 ( 11 )   3765 - 3769   2008.6

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    Neutron powder diffraction study on the crystal and magnetic structures of BiCrO3

    DOI： 10.1021/cm800375d

  • Magnetovolume effect in Mn3Cu1-xGexN related to the magnetic structure: Neutron powder diffraction measurements Reviewed

    Iikubo S, Kodama K, Takenaka K, Takagi H, Shamoto S

    PHYSICAL REVIEW B   77 ( 2 )   2008.1

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    Magnetovolume effect in Mn3Cu1-xGexN related to the magnetic structure: Neutron powder diffraction measurements

    DOI： 10.1103/PhysRevB.77.020409

  • Local crystal structure of multiferroic system BiMnO3 by atomic pair distribution function analysis Reviewed

    Katsuaki Kodama, Satoshi Iikubo, Shin-Ichi Shamoto, Alexei A. Belik, Eiji Takayama-Muromachi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 12 )   124605 - 124605   2007.12

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    DOI： 10.1143/JPSJ.76.124605

  • Origin of the monoclinic-to-monoclinic phase transition and evidence for the centrosymmetric crystal structure of BiMnO3 Reviewed

    Alexei A. Belik, Satoshi Iikubo, Tadahiro Yokosawa, Katsuaki Kodama, Naoki Igawa, Shinichi Shamoto, Masaki Azuma, Mikio Takano, Koji Kimoto, Yoshio Matsui, Eiji Takayama-Muromachi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   129 ( 4 )   971 - 977   2007.1

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    DOI： 10.1021/ja0664032

  • Local crystal structures of Ge(2)Sb(2)Te5 revealed by the atomic pair distribution function analysis Reviewed

    Shin-ichi Shamoto, Katsuaki Kodama, Satoshi Iikubo, Tomitsugu Taguchi, Noboru Yamada, Thomas Proffen

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   45 ( 11 )   8789 - 8794   2006.11

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    DOI： 10.1143/JJAP.45.87891

  • Electron-phonon coupling reflecting dynamic charge inhomogeneity in copper oxide superconductors Reviewed

    D Reznik, L Pintschovius, M Ito, S Iikubo, M Sato, H Goka, M Fujita, K Yamada, GD Gu, JM Tranquada

    NATURE   440 ( 7088 )   1170 - 1173   2006.4

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    DOI： 10.1038/nature04704

  • Neutron powder diffraction study on the crystal and magnetic structures of BiCoO3 Reviewed

    AA Belik, S Iikubo, K Kodama, N Igawa, S Shamoto, S Niitaka, M Azuma, Y Shimakawa, M Takano, F Izumi, E Takayama-Muromachi

    CHEMISTRY OF MATERIALS   18 ( 3 )   798 - 803   2006.2

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    DOI： 10.1021/cm052334z

  • BiSCO3: Centrosymmetric BiMnO3-type oxide Reviewed

    AA Belik, S Iikubo, K Kodama, N Igawa, S Shamoto, M Maie, T Nagai, Y Matsui, SY Stefanovich, BI Lazoryak, E Takayama-Muromachi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   128 ( 3 )   706 - 707   2006.1

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    DOI： 10.1021/ja057574u

  • Magnetic structure of Sr2MnO3.5 Reviewed

    C Kato, S Iikubo, M Soda, M Sato, K Kakurai, S Yoshii

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 3 )   1026 - 1029   2005.3

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    DOI： 10.1143/JPSJ.74.1026

  • On the magnetic excitation spectra of high-T-c Cu oxides at energies up to the region far above the resonance energy Reviewed

    S Iikubo, M Ito, A Kobayashi, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 1 )   275 - 278   2005.1

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    DOI： 10.1143/JPSJ.74.275

  • Magnetic structures and spin states of NdBaCo2O5.5 Reviewed

    M Soda, Y Yasui, M Ito, S Iikubo, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 10 )   2857 - 2862   2004.10

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    DOI： 10.1143/JPSJ.73.2857

  • Magnetic structure of a spinel systern Cu0.3Zn0.7Cr2Se4 Reviewed

    S Iikubo, Y Yasui, Y Kobayashi, Y Ohno, M Ito, M Soda, M Sato, K Kakurai

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272 ( 1 )   473 - 474   2004.5

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    DOI： 10.1016/j.jmmm.2003.12.443

  • Studies on the (non-) existence of "stripes" in high T-c superconductors Reviewed

    M. Ito, Y. Yasui, S. Iikubo, M. Soda, A. Kobayashi, M. Sato, K. Kakurai, C. H. Lee, K. Yamada

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272 ( 1 )   E1051 - E1053   2004.5

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    DOI： 10.1016/j.jmmm.2003.12.638

  • Magnetic structure of Cu0.3Zn0.7Cr2Se4 Reviewed

    S Iikubo, Y Ohno, Y Kobayashi, Y Yasui, M Ito, M Soda, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   1023 - 1030   2004.4

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    DOI： 10.1143/JPSJ.73.1023

  • Studies on magnetic excitation spectra of high-T-c superconductors Reviewed

    M Ito, Y Yasui, S Iikubo, M Soda, A Kobayashi, M Sato, K Kakurai, CH Lee, K Yamada

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   991 - 999   2004.4

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    DOI： 10.1143/JPSJ.73.991

  • Magnetic structures and spin states of NdBaCo2O5 Reviewed

    M Soda, Y Yasui, M Ito, S Iikubo, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 2 )   464 - 468   2004.2

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    DOI： 10.1143/JPSJ.73.464

  • Ferromagnetic transition of pyrochlore compound Yb2Ti2O7 Reviewed

    Y Yasui, M Soda, S Iikubo, M Ito, M Sato, N Hamaguchi, T Matsushita, N Wada, T Takeuchi, N Aso, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 11 )   3014 - 3015   2003.11

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    DOI： 10.1143/JPSJ.72.3014

  • Effect of “Stripe” on the Magnetic Excitation Spectra of La1.48Nd0.4Sr0.12CuO4 Reviewed

    M.Ito,Y. Yasui, S. Iikubo, M. Soda, M. Sato, A. Kobayashi, K. Kakurai

    Journal of the Physical Society of Japan   72 ( 7 )   1627 - 1630   2003.7

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    Effects of "stripes" on the magnetic excitation spectra of La1.48Nd0.4Sr0.12CuO4
    The wave vector (q)- and energy (omega)-dependent magnetic excitation spectra chi"(q, omega), have been studied in the temperature (T) range of 10K less than or equal to T < 150K on single crystals of La1.48Nd0.4Sr0.12CuO4, which has the static "stripe" order in the low-temperature phase. The incommensurability delta of the peak of chi"(q, omega) found by the q-scans and the peak width Deltaq exhibit characteristic T dependences. The observed profiles show a clear incommensurate structure even at rather high temperatures. The results indicate that effects of the slowly fluctuating "stripes" exist not only in the low-temperature tetragonal (LTT) phase but also in the orthorhombic phase (LTO1) of the present system.

    DOI： 10.1143/JPSJ.72.1627

  • Anomalous Hall effect of reentrant spin glass system Fe1-xAlx (x similar to 0-3) Reviewed

    T Kageyama, N Aito, S Iikubo, M Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 6 )   1491 - 1494   2003.6

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    DOI： 10.1143/JPSJ.72.1491

  • Comparative study on the magnetic excitation spectra of Y123 and La214 high-T-c systems - are the dynamical stripes important? Reviewed

    M Sato, M Ito, H Harashima, Y Yasui, S Iikubo, A Kobayashi, K Kakurai

    PHYSICA B-CONDENSED MATTER   329 ( 2 )   683 - 684   2003.5

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    DOI： 10.1016/S0921-4526(02)01990-7

  • Magnetic structure and the anomalous Hall effect Cu1-xZnxCr2Se4 Reviewed

    S Iikubo, Y Ohno, Y Yasui, T Fukamachi, K Oda, M Sato, K Kakurai

    PHYSICA B-CONDENSED MATTER   329 ( 2 )   707 - 708   2003.5

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    DOI： 10.1016/S0921-4526(02)02018-5

  • Detailed studies on the anomalous Hall effect of pyrochlore molybdates Reviewed

    Y Yasui, T Kageyama, S Iikubo, K Oda, M Sato, K Kakurai

    PHYSICA B-CONDENSED MATTER   329 ( 2 )   1036 - 1037   2003.5

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    DOI： 10.1016/S0921-4526(02)02237-8

  • Neutron scattering studies of pyrochlore compound Nd2Mo2O7 in magnetic field Reviewed

    Y Yasui, S Iikubo, H Harashina, T Kageyama, M Ito, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 4 )   865 - 872   2003.4

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    DOI： 10.1143/JPSJ.72.865

  • Magnetic structure and the Hall resistivity of Cu1-xZnxCr2Se4 Reviewed

    S Iikubo, Y Yasui, K Oda, Y Ohno, Y Kobayashi, M Sato, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 11 )   2792 - 2799   2002.11

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    DOI： 10.1143/JPSJ.71.2792

  • Transport and NQR studies of Nd1.6-xCexSr0.4CuO4 with T* structure Reviewed

    M Ambai, Y Kobayashi, S Iikubo, M Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 2 )   538 - 542   2002.2

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    DOI： 10.1143/JPSJ.71.538

  • Detailed structure of the magnetic excitation spectra of YBa2Cu3Oy and its implication on the physical characteristics of the electron system Reviewed

    M Ito, H Harashina, Y Yasui, M Kanada, S Iikubo, M Sato, A Kobayashi, K Kakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 1 )   265 - 270   2002.1

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    DOI： 10.1143/JPSJ.71.265

  • Neutron scattering study of the spin correlation in the spin ice system Ho2Ti2O7 Reviewed

    M Kanada, Y Yasui, Y Kondo, S Iikubo, M Ito, H Harashina, M Sato, H Okumura, K Kakurai, H Kadowaki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 1 )   313 - 318   2002.1

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    DOI： 10.1143/JPSJ.71.313

  • Study on anomalous Hall resistivity of Nd2Mo2-xTixO7 Reviewed

    T Kageyama, S Iikubo, S Yoshii, Y Kondo, M Sato, Y Iye

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 10 )   3006 - 3010   2001.10

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    DOI： 10.1143/JPSJ.70.3006

  • Magnetic and transport properties of phyrochlore molybdates Reviewed

    S Iikubo, S Yoshii, T Kageyama, K Oda, Y Kondo, K Murata, M Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   70 ( 1 )   212 - 218   2001.1

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  • Anomalous Hall effect of pyrochlore molybdate Nd2Mo2O7 Reviewed

    S Yoshii, S Iikubo, T Kageyama, K Oda, Y Kondo, K Murata, M Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   69 ( 12 )   3777 - 3780   2000.12

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    DOI： 10.1143/JPSJ.69.3777

  • Suppression of Defect and Trap Density through Dimethylammonium-Substituted Tin Perovskite Solar Cells Reviewed

    M.A. Kamarudin, S.R. Sahamir, K. Nishimura, S. Iikubo, K. Yoshino, T. Minemoto, Q. Shen, S. Hayase

    ACS Materials Letters   4 ( 9 )   1855 - 1862   1900

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  • Spin-Stripe Density Varies Linearly With the Hole Content in Single-Layer Bi2+xSr2-xCuO6+y Cuprate Superconductors Reviewed

    M. Enoki, M. Fujita, T. Nishizaki, S. Iikubo, D.K. Singh, S. Chang, J.M.Tranquada, K. Yamada

    Phys. Rev. Lett.   110   1900

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  • Thermodynamic analysis of the Mg–RE–Zn (RE = Y, La) ternary hcp phase using the cluster variation Reviewed

    S. Iikubo, S. Hamamoto, and H. Ohtani

    AIP Advances   8   1900

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  • Thermodynamic stability of Mg-based Laves phases Reviewed

    S. Kawano, S. Iikubo, and H. Ohtani

    Mater. Trans.   59   890 - 896   1900

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  • Solution-Processed Air-Stable Copper Bismuth Iodide for Photovoltaics Reviewed

    Z. Hu, Z. Wang, G. Kapil, T. Ma, S. Iikubo, T. Minemoto, K. Yoshino, T. Toyoda, Q. Shen, S. Hayase

    ChemSusChem   11   1900

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  • First-Principles Study on Hydrogen Diffusivity in BCC, FCC, and HCP Iron Reviewed

    K. Hirata, S. Iikubo, M. Koyama, K. Tsuzaki, H. Ohtani

    Metallurgical and Materials Transactions A   49   5015 - 5022   1900

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  • First-principles calculations of the effects of Mn, Cr, and Ni on hydrogen diffusion in BCC, FCC, and HCP Fe Reviewed

    Hirata, K., Iikubo, S., Ohtani, H

    Journal of the Iron and Steel Institute of Japan   105 ( 2 )   109 - 117   1900

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  • Development of Organo-Dispersible Graphene Oxide via Pseudo-Surface Modification for Thermally Conductive Green Polymer Composites Reviewed

    S. Sim, Y. Andou, H.A.A. Bashid, H. Lim, M. Altarawneh, Z. Jiang, K. Eksiler, S. Iikubo

    ACS Omega   3 ( 12 )   18124 - 18131   1900

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  • Role of GeI2 and SnF2 additives for SnGe perovskite solar cells Reviewed

    C. H. Ng, K. Nishimura, N. Ito, K. Hamada, D. Hirotani, Z. Wang, F. Yang, S. likubo, Q. Shen, K. Yoshino, T. Minemoto, S. Hayase

    Nano Energy   58   130 - 137   1900

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  • Ground-state Search and Thermoelectric Properties for Mixed Iodide Perovskite A(B,B’)I3 (A=CH3NH3 and Cs, B,B’=Ge, Sn and Pb Reviewed

    K. Yamamoto, G. Narita, J. Yamasaki, S. Iikubo

    Journal of Physics and Chemistry of Solids   140   1900

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  • Effect of Precursor Solution Aging on the Thermoelectric Performance of CsSnI<inf>3</inf> Thin Film Reviewed

    Baranwal A., Saini S., Wang Z., Hamada K., Hirotani D., Nishimura K., Kamarudin M., Kapil G., Yabuki T., Iikubo S., Shen Q., Miyazaki K., Hayase S

    Journal of Electronic Materials   1900

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  • Theoretical analysis of band alignment at back junction in Sn–Ge perovskite solar cells with inverted p-i-n structure Reviewed

    Minemoto T., Kawano Y., Nishimura T., Shen Q., Yoshino K., Iikubo S., Hayase S

    Solar Energy Materials and Solar Cells   1900

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  • Relationship between perovsktie solar cell efficiency and lattice disordering Reviewed

    Hirotani, Daisuke; Nishimura, Kohei; Hamada, Kengo; Kamarudin, Muhammad Akmal; Iikubo, Satoshi; Shen, Qing; Toyoda, Taro; Hayase, Shuzi

    Japanese Journal of Applied Physics   60 ( 3 )   1900

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  • Impact of Auger recombination on performance limitation of perovskite solar cell Reviewed

    Chantana, Jakapan; Kawano, Yu; Nishimura, Takahito; Mavlonov, Abdurashid; Shen, Qing; Yoshino, Kenji; Iikubo, Satoshi; Hayase, Shuzi; Minemoto, Takashi

    Solar Energy   217   342 - 353   1900

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Bimetallic sulfide sns2/fes2 nanosheets as high-performance anode materials for sodium-ion batteries Reviewed

    Chen, Yun; Liu, Hongbin; Guo, Xiaolin; Zhu, Shangping; Zhao, Yue; Iikubo, Satoshi; Ma, Tingli

    ACS Applied Materials & Interfaces   13 ( 33 )   39248 - 39256   1900

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  • The Relationship between Crystal Structure and Mechanical Performance for Fabrication of Regenerated Cellulose Film through Coagulation Conditions Reviewed

    Kawano, Tessei; Iikubo, Satoshi; Andou, Yoshito

    Polymers   13 ( 24 )   1900

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  • Structural stability and optical properties of tin-based iodide perovskite Reviewed

    Ide, A; Iikubo, S; Yamamoto, K; Shen, Q; Yoshino, K; Minemoto, T; Hayase, S

    Japanese Journal of Applied Physics   61 ( 3 )   1900

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  • The Effect of Increasing Nickel Content on the Microstructure, Hardness, and Corrosion Resistance of the CuFeTiZrNi x High-Entropy Alloys Reviewed

    Kuo, Po-Cheng; Chen, Sin-Yi; Yu, William; Okumura, Ryo; Iikubo, Satoshi; Laksono, Andromeda Dwi; Yen, Yee-Wen; Pasana, Alberto S

    Materials   15 ( 9 )   1900

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  • Influence of charge transport layer on the crystallinity and charge extraction of pure tin-based halide perovskite film Reviewed

    Zhang, Yaohong; Kamarudin, Muhammad Akmal; Li, Qiao; Ding, Chao; Zhou, Yong; Yao, Yingfang; Zou, Zhigang; Iikubo, Satoshi; Minemoto, Takashi; Yoshino, Kenji

    Journal of Energy Chemistry   69   612 - 615   1900

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  • Structural and thermoelectric properties of CH3NH3SnI3 perovskites processed by applying high pressure with shear strain Reviewed

    Wang, Qing; Tang, Yongpeng; Horita, Zenji; Iikubo, Satoshi

    Materials Research Letters   10 ( 8 )   521 - 529   1900

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▼display all

Presentations

  • CuFeTiZr-Nix ハイエントロピー合金の電子状態計算

    奥村崚, 飯久保 智, Kou Po-Cheng, Yen Yee-Wen

  • Sn ペロブスカイトの Sn 欠損に A サイトイオンが及ぼす影響

    飯久保智 , 奥村太一 , 奥村崚 , 早瀬修二

  • Integrated Study of First-principles Calculations and Experimental Measurements for Hydrogen Effect on FCC to HCP Martensitic Transformation

    S. Iikubo, K. Hirata, Y. Kuroki, S. Kawano, H. Ohtani, M, Koyama, K. Tsuzaki

  • Observation of deuterium in the tetrahedral interstitial site in HCP structured steal

    S. Iikubo, Y. Kuroki, S. Kawano, K. Katsuaki, M. Koyama, K. Tsuzaki

  • First-Principles Study of Atomic Location and its Effect on the Electronic State of Impurity Elements in Tin Iodide Perovskite

    S. Iikubo, J. Yamasaki, K. Yamamoto, K. Tanaka, Y. Ogomi, and S. Hayase

  • Effect of substitution on the stability in Tin based Perovskite: First- Principles study

    K. Yamamoto, S. Iikubo

  • Lattice dynamics of all-inorganic perovskite CsSnX3 (X = Cl, Br, and I): A first-principles study

    S. Kawano, S. Iikubo

  • 2 次元構造を持つハロゲン化ペロブスカイトの熱電特性計算

    成田 昴宇, 山本 久美子, 飯久保 智

  • 鉛フリー有機無機ペロブスカイトの電子状態計算

    井手 敦子, 山本 久美子, 奥村 崚, 飯久保 智, 早瀬 修二

  • 進化的アルゴリズムによる有機無機ペロブスカイト化合物の安定構造探索と熱電 特性

    山本 久美子, 飯久保 智

  • 進化的アルゴリズムによる有機無機ペロブスカイト化合物の安定構造探索造

    山本 久美子, 飯久保 智

  • CH3NH3SnI3 の表面電子構造

    奥村 崚, 飯久保 智

  • 鉄鋼における FCC-HCP 変態の水素濃度依存性に関する第一原理計算

    黒木 友偉、河野 翔也、飯久保 智、平田 研二、大谷 博司、小山 元道、津﨑 兼彰

  • CuFeTiZr-Nix ハイエントロピー合金の電子状態計算

    奥村崚, 飯久保 智, Kou Po-Cheng, Yen Yee-Wen

  • Sn ペロブスカイトの Sn 欠損に A サイトイオンが及ぼす影響

    飯久保智 , 奥村太一 , 奥村崚 , 早瀬修二

  • Integrated Study of First-principles Calculations and Experimental Measurements for Hydrogen Effect on FCC to HCP Martensitic Transformation

    S. Iikubo, K. Hirata, Y. Kuroki, S. Kawano, H. Ohtani, M, Koyama, K. Tsuzaki

  • Observation of deuterium in the tetrahedral interstitial site in HCP structured steal

    S. Iikubo, Y. Kuroki, S. Kawano, K. Katsuaki, M. Koyama, K. Tsuzaki

  • First-Principles Study of Atomic Location and its Effect on the Electronic State of Impurity Elements in Tin Iodide Perovskite

    S. Iikubo, J. Yamasaki, K. Yamamoto, K. Tanaka, Y. Ogomi, and S. Hayase

  • Effect of substitution on the stability in Tin based Perovskite: First- Principles study

    K. Yamamoto, S. Iikubo

  • Lattice dynamics of all-inorganic perovskite CsSnX3 (X = Cl, Br, and I): A first-principles study

    S. Kawano, S. Iikubo

  • 2 次元構造を持つハロゲン化ペロブスカイトの熱電特性計算

    成田 昴宇, 山本 久美子, 飯久保 智

  • 鉛フリー有機無機ペロブスカイトの電子状態計算

    井手 敦子, 山本 久美子, 奥村 崚, 飯久保 智, 早瀬 修二

  • 進化的アルゴリズムによる有機無機ペロブスカイト化合物の安定構造探索と熱電 特性

    山本 久美子, 飯久保 智

  • 進化的アルゴリズムによる有機無機ペロブスカイト化合物の安定構造探索造

    山本 久美子, 飯久保 智

  • CH3NH3SnI3 の表面電子構造

    奥村 崚, 飯久保 智

  • 鉄鋼における FCC-HCP 変態の水素濃度依存性に関する第一原理計算

    黒木 友偉、河野 翔也、飯久保 智、平田 研二、大谷 博司、小山 元道、津﨑 兼彰

  • ペロブスカイト化合物CsSnI3の第一原理フォノン計算

    河野 翔也, 飯久保 智, 只野 央将

  • Hydrogen diffusion in HCP iron: A first-principles study

    S. Iikubo, K. Hirata, Y. Kuroki, S. Kawano, H. Ohtani, M. Koyama, K. Tsuzaki

  • Effect of substituted atoms for stacking fault formation in LPSO system

    S. Kawano and S. Iikubo

  • Thermodynamic properties in Organic-inorganic hybrid perovskite

    S. Iikubo, K. Yamamoto, J. Yamasaki, S. Kawano, and S. Hayase

  • First-principles study of transport properties in Cs(Pb,Sn,Ge)I3

    K. Yamamoto, S. Iikubo

  • Lattice dynamics of an organic-inorganic hybrid perovskite: A first- principles study

    S. Kawano, S. Iikubo

  • Role of substituted atoms on stacking fault formation in long-period ordered system

    S. Kawano, S. Iikubo

  • First-principles study of Structural stability in Perovskite materials

    S. Iikubo, K. Yamamoto, J. Yamasaki, and S. Hayase

  • 有機無機ペロブスカイトの安定構造探索と熱電特性

    山本 久美子, 山崎 純, 成田 昴宇, 飯久保 智

  • ペロブスカイト/酸化物の界面構造の安定性

    山崎 純, 山本 久美子, 飯久保 智, 早瀬 修二

  • 有機無機ペロブスカイトの格子振動に関する第一原理計算

    河野 翔也, 飯久保 智

  • 鉄鋼における FCC- HCP 変態への水素の影響

    黒木 友偉、河野 翔也、飯久保 智、平田 研二、大谷 博司、小山 元道、津崎 兼彰

  • 第一原理計算を用いたペロブスカイト型熱電材料の探索

    成田 昴宇, 飯久保 智, 山本 久美子, 山崎 純

  • First-principles study of Structural stability of Perovskite and related materials for Solar Cells

    S. Iikubo, K. Yamamoto, J. Yamasaki, Y. Ogomi, and S. Hayase

  • 第一原理計算による鉄中窒素の拡散挙動に関する調査

    黒木 友偉, 飯久保 智, 平田 研二

  • 鉄中の水素拡散に添加元素が与える影響

    平田 研二, 飯久保 智, 大谷 博司

  • マグネシウム合金における HPC から LPSO 構造形成への Zn と Y の効 果

    河野 翔也, 飯久保 智, 只野 央将

  • ロブスカイト/酸化物界面における元素置換効 果

    山崎 純, 山本 久美子, 飯久保 智, 田中 一成, 早瀬 修二

  • CH3NH3SnI3 の熱電特性に対する不純物効果

    山本 久美子 久保 智, 山崎 純, 成田昴宇

  • Yb2Si2O7 の分子動力学シミュレーション

    藤井 将史, 飯久保 智

  • Thermodynamic properties of Cu–Pb–F ternary system

    S. Iikubo, S. Kawano, K. Yamamoto, Y. Suzuki, K. Hirata, H. Harada

  • First-principles study of partially substituted perovskite Solar Cells

    K. Yamamoto, S. Iikubo, J. Yamasaki, Y. Ogomi, S. Hayase

  • 鉄中における炭素の拡散運動

    黒木 友偉, 飯久保 智, 平田 研二

  • 鉄鋼中の水素拡散に添加元素が与える影響

    平田 研二, 飯久保 智, 大谷博司

  • Mg における HCP-FCC 変態に関する第一原理計算

    河野 翔也, 飯久保 智, 大谷 博司

  • 第一原理計算による有機無機ペロブスカイト化合物の熱電特性評価

    山崎 純, 山本 久美子, 飯久保 智

  • Ground state predictions for sulfide electrolyte

    S. Iikubo, K. Shimoyama, S. Kawano, M. Fujii, M. Matsushita, T. Shinmei, and H. Ohtani

  • First principles study of hydrogen diffusion in iron

    K. Hirata, S. Iikubo, H. Ohtani

  • 計算科学的手法を用いたペロブスカイト太陽電池の物質探索

    山崎 純, 山本 久美子, 飯久保 智

  • 酸化物の分子動力学ポテンシャルの作成

    藤井 将史, 河野 翔也, 飯久保 智

  • Fe-FCC, HCP における水素拡散の活性化エネルギー

    平田 研二, 飯久保 智, 大谷 博司

  • Structual stability in Perovskite Solar Cells

    K. Yamamoto, S. Iikubo, Y. Ogomi, S. Hayase

  • Crystal structure of novel high pressure phase of Li-P-S compounds

    K. Shimoyama, S. Kawano, M. Fujii, S. Iikubo, M. Matsushita, T. Shinmei, H. Ohtani,

  • Spinodal decomposition in Cu-Pb binary alloy

    K. Hirata, Y. Suzuki, K. Kusunoki, Y. Horibe, S. Iikubo

  • 第一原理計算を用いた Mn 基新規磁性材料の探索

    橋本 さや加, 飯久保 智

  • Cu-(Pb,Bi) 合金におけるスピノーダル分 解挙動の観察

    鈴木 雄文, 平田 研二, 赤瀬 仁, 飯久保 智, 楠 献一郎, 堀部 陽一

  • Thermodynamic Analysis of Phase Equilibria in the Mg-Al-Sc Ternary System

    S. Kawano, S. Hamamoto, T. Tokunaga, S. Iikubo, H. Ohtani

  • Cu-Pb 合金におけるスピノーダル分解挙動 の観察

    鈴木雄文, 平田 研二, 赤瀬 仁, 楠 献一朗, 堀部 陽一, 飯久保 智

  • NEB 法による Fe 中における水素拡散の活性化エネルギーの評価

    平田 研二, 飯久保 智, 大谷 博司

  • 有機無機ペロブスカイト化合物の構造安定性と電荷分布

    山本 久美子, 飯久保 智, 尾込 裕平, 早瀬 修二

  • Li-P-S 高圧新規相の結晶構造

    霜山 晃一, 河野 翔也, 藤井 将史, 飯久保 智, 松下 正史, 新名 亨, 大谷 博司

  • First principles investigation of laves phases in Mg based Alloys

    S. Kawano, S. Iikubo, H. Ohtani

  • 新規 Li-P-S 化合物の探索

    霜山晃一, 飯久保智, 藤井将史, 新名亨, 松下正史, 大谷博司

  • ペロブスカイト型太陽電池の構造安定性に CH3NH3+が与える 影響

    山本久美子, 飯久保智, 尾込裕平, 早瀬修二

  • Ground state prediction for Li-Ge-P-S system

    S. Iikubo

  • Thermodynamic assessment of Fe-Ti-S temary phase diagram by using cluster variation method

    K. Hirata, S. Iikubo, H. Ohtani

  • ラーベス相 MgX2 の相安定性に関する第一原理計算

    河野翔也, 飯久保 智, 大谷 博司

  • 第一原理計算を用いたペロブスカイト型太陽電池の安定構 造探索

    山本 久美子, 飯久保 智, 尾込 裕平、早瀬 修二

  • Mg97Zn1Gd2合金における LPSO 構造形成に及ぼす溶融後冷却速度の影響

    徳永 辰也, 山本 美鈴, 池田 昇平, 飯久 保智, 大谷 博司, 惠良 秀則

  • Molecular dynamics study on diffusion behavior of Li in Li10GeP2S12

    S. Kawano, S. Iikubo

  • Thermodynamic Properties in Mg-based Ternary Systems

    S. Iikubo, H. Ohtani

  • 18R 構造における自由エネルギー計算

    飯久保 智、大谷 博司

  • クラスター展開 · 変分法を用いた Fe-Ti-S3 元系状態図の解析

    平田 研二 、飯久保 智、大谷 博司

  • Mg97Zn1RE2合金における凝固偏析の定量評価

    池田昇平，徳永辰也，恵良秀則，飯久保智，大谷博司

  • Ground state prediction for Li-Ge-P-S system

    S. Iikubo

  • 第一原理計算による Li-P-S 三元系状態図

    山本 久美子, 霜山 晃一, 飯久保 智, 大谷 博司

  • 新規 Li-P-S 化合物の探索

    霜山 晃一, 河野 翔也, 山本 久美子, 飯久保 智

  • 第一原理計算の計算状態図への適用

    飯久保 智, 徳永 辰也, 大谷 博司

    セラミックス  2011.6 

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    Application of The First-Principles Calculations into The Calculation of Phase Diagram

  • 22pGC-4 逆ペロフスカイトマンガン窒化物における磁気秩序の圧力効果(22pGC 遍歴磁性・化合物磁性,領域3(磁性,磁気共鳴))

    飯久 保智, 稲垣 哲也, 竹中 康司, 高木 英典, 樹神 克明, 社本 真一, 松林 和幸, 上床 美也

    日本物理学会講演概要集  2010.3 

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    22pGC-4 Pressure Effect on Magnetic Ordering in Antiperovskite manganese nitrides

  • 23aPS-52 単結晶Fe(Se_<1-x>Te_x)_yの中性子非弾性散乱(23aPS 領域8ポスターセッション(低温I(鉄系超伝導,銅酸化物など)),領域8(強相関系:高温超伝導,強相関f電子系など))

    飯久保 智, 藤田 全基, Gu G. D., Tranquada J. M.

    日本物理学会講演概要集  2010.8 

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    23aPS-52 Neutron inelastic scattering study of single crystal Fe(Se_<1-x>Te_x)_y

  • 26aWG-11 希薄ドープBi_<2.4>Sr_<1.6>CuO_<6+δ>における対角方向の非整合スピン相関の研究(26aWG 高温超伝導2(理論・磁気共鳴・中性子),領域8(強相関系:高温超伝導,強相関f電子系など))

    榎木 勝徳, 藤田 全基, 阿井 雄貴, 飯久保 智, Tranquada John. M., 山田 和芳

    日本物理学会講演概要集  2010.8 

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    26aWG-11 Study of diagonal incommensurate spin correlation in lightly-doped Bi_<2.4>Sr_<1.6>CuO_<6+δ>

  • 26aWG-12 Fe置換効果を通してみたLSCOの不足・過剰ドープ組成における磁気揺らぎの特徴(26aWG 高温超伝導2(理論・磁気共鳴・中性子),領域8(強相関系:高温超伝導,強相関f電子系など))

    藤田 全基, 榎木 勝徳, 松浦 直人, 飯久保 智, 山田 和芳

    日本物理学会講演概要集  2010.8 

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    26aWG-12 Nature of spin fluctuations in under and over-doped regions of Fe-doped LSCO

  • 電子論による合金の熱力学物性評価と状態図計算への応用 (特集 状態図の第一原理熱力学計算--現状と展望)

    大谷 博司, 飯久保 智, 長谷部 光弘

    金属  2010.1 

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  • 27aTJ-4 パルス中性子散乱によるBi2201超伝導体の高エネルギー磁気励起の研究(高温超伝導(中性子散乱,NMRなど),領域8,強相関系:高温超伝導,強相関f電子系など)

    藤田 全基, 榎木 勝徳, 飯久保 智, Frost C. D., 山田 和芳

    日本物理学会講演概要集  2009.8 

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    27aTJ-4 High-energy spin excltations in superconducting Bi2201 system studied by pulsed-neutron-scattering measurement

  • 27aTJ-5 LSCOの不足・過剰ドープ組成の静的磁気相関に対するFe置換効果(高温超伝導(中性子散乱,NMRなど),領域8,強相関系:高温超伝導,強相関f電子系など)

    藤田 全基, 榎木 勝徳, 飯久保 智, 山田 和芳

    日本物理学会講演概要集  2009.8 

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    27aTJ-5 Fe substitution effect on static spin correlation in under- and over-doped LSCO

  • 27aTJ-7 Bi2201における磁気励起スペクトルのホール濃度依存性(高温超伝導(中性子散乱,NMRなど),領域8,強相関系:高温超伝導,強相関f電子系など)

    榎木 勝徳, 藤田 全基, 飯久保 智, 山田 和芳

    日本物理学会講演概要集  2009.8 

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    27aTJ-7 Hole doping dependence of the spin excitation spectrum in Bi2201 superconductor

  • 30aTC-3 圧力下中性子散乱によるFeTe_<0.92>の構造相転移と磁気秩序の研究(30aTC 鉄砒素超伝導体5(中性子,NMR),領域8(強相関系:高温超伝導,強相関f電子系など))

    藤田 全基, 飯久 保智, 松田 雅昌, 長壁 豊隆, 山内 宏樹, 新高 誠司, 高木 英典, 山田 和芳

    日本物理学会講演概要集  2009.3 

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    30aTC-3 Neutron-scattering study of structural and magnetic transitions in FeTe_<0.92> under high pressure

  • 30aTC-4 新規鉄系超伝導体Fe(Se_<1-x>Te_x)_yの中性子散乱(30aTC 鉄砒素超伝導体5(中性子,NMR),領域8(強相関系:高温超伝導,強相関f電子系など))

    飯久保 智, 藤田 全基, 新高 誠司, 高木 英典, 榎木 勝徳, 山田 和芳

    日本物理学会講演概要集  2009.3 

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    30aTC-4 Neutron scattering study of novel superconductor Fe(Se_<1-x>Te_x)_y

  • 20pPSA-41 マンガン逆ペロフスカイトの結晶・磁気構造(20pPSA 領域8ポスターセッション(低温:Mn酸化物,V酸化物,鉄オキシニクタイドなど),領域8(強相関系:高温超伝導,強相関f電子系など))

    飯久保 智, 樹神 克明, 竹中 康司, 高木 英典, 瀧川 仁, 社本 真一

    日本物理学会講演概要集  2008.8 

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    20pPSA-41 Magnetic structure of Mn_3Cu_<1-x>Ge_xN

  • 20pQE-1 中性子散乱によるBi2201の超伝導相における磁気相関の研究(20pQE 高温超伝導(置換効果・不純物効果),領域8(強相関系:高温超伝導,強相関f電子系など))

    榎木 勝徳, 藤田 全基, 飯久保 智, 山田 和芳

    日本物理学会講演概要集  2008.8 

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    20pQE-1 Neutron-scattering study of magnetic correlation in Bi2201 with superconductor phase

  • 25pWL-15 CoZn(TeO_3)Br_2の磁気構造(25pWL 量子スピン系(一次元系),領域3(磁性,磁気共鳴))

    菓子 隆史, 安井 幸夫, 茂吉 武人, 佐藤 正俊, 飯久 保智, 井川 直樹, 加倉井 和久

    日本物理学会講演概要集  2008.2 

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    25pWL-15 Magnetic Structure of CoZn(TeO_3)Br_2

  • 逆ペロブスカイト型マンガン窒化物の磁気体積効果 : 磁気構造と局所構造との関わり

    社本 真一, 飯久保 智, 樹神 克明, 竹中 康司, 高木 英典

    日本磁気学会研究会資料 = Bulletin of Topical Symposium of the Magnetics Society of Japan  2008.5 

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    Magnetovolume Effect on Antiperovskite-type Manganese Nitrides : Relationship to the magnetic structure and the local structure

  • 20pRB-15 Mn3(Cu_<1-x>Ge_x)Nの磁気構造(20pRB 遍歴磁性,領域3(磁性,磁気共鳴))

    飯久保 智, 樹神 克明, 竹中 康司, 高木 英典, 社本 真一

    日本物理学会講演概要集  2007.2 

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    20pRB-15 Magnetic structure of Mn3(Cu_<1-x>Ge_x)N

  • 21aPS-82 マルチフェロイック物質BiMnO_3の局所構造解析(領域8ポスターセッション(低温),領域8,強相関系:高温超伝導,強相関f電子系など)

    樹神 克明, 飯久保 智, 社本 真一, Belik Alexei A., 室町 英治

    日本物理学会講演概要集  2007.8 

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    21aPS-82 PDF analysis on local lattice structure of multiferroic system BiMnO_3

  • 21aWE-10 巨大負熱膨張物質Mn_3Cu_<1-x>Ge_xNの中性子散乱(遍歴電子系・磁性半導体,領域3,磁性,磁気共鳴)

    飯久保 智, 樹神 克明, 竹中 康司, 高木 英典, 社本 真一

    日本物理学会講演概要集  2007.8 

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    21aWE-10 Magnetic structure of Mn_3Cu_<1-x>Ge_xN

  • 21aWE-9 巨大負熱膨張物質Mn_3Cu_<1-x>Ge_xNの^<14>N-NMR(遍歴電子系・磁性半導体,領域3,磁性,磁気共鳴)

    樹神 克明, 瀧川 仁, 飯久保 智, 竹中 康司, 高木 英典, 社本 真一

    日本物理学会講演概要集  2007.8 

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    21aWE-9 NMR study on Mn_3Cu_<1-x>Ge_xN with large negative thermal expansion

  • 26aXH-3 Mn_3(Cu_<1-x>Ge_x)Nの磁気体積効果(26aXH 遍歴磁性,領域3(磁性,磁気共鳴))

    飯久保 智, 竹中 康司, 高木 英典, 樹神 克明, 社本 真一

    日本物理学会講演概要集  2006.8 

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    26aXH-3 Magnet Volume Effect of Mn_3(Cu_<1-x>Ge_x)N

  • 20aPS-49 Mn酸化物ナノ粒子の局所構造解析(領域8ポスターセッション(低温),領域8(強相関系 : 高温超伝導,強相関f電子系など))

    飯久保 智, 古屋仲 秀樹, 北條 智博, 鈴木 淳市, 竹内 謙, 小原 真司, 樹神 克明, 山本 博之, 社本 真一

    日本物理学会講演概要集  2005.8 

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    20aPS-49 Local structure analysis of Mn oxide nanoparticle

  • 24pWF-4 PrBaCo_2O_5の電荷秩序と磁気構造(Co系1(ペロブスカイト・その他),領域8(強相関系:高温超伝導,強相関f電子系など))

    左右田 稔, 安井 幸夫, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2005.3 

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    24pWF-4 Magnetic and Charge Ordering Transitions of PrBaCo_2C_5

  • 25pPSA-31 高温超伝導体の磁気励起スペクトルに対するストライプの影響(低温,領域8ポスターセッション,領域8(強相関系:高温超伝導,強相関f電子系など))

    飯久保 智, 伊藤 雅典, 茂吉 武人, 左右田 稔, 安井 幸夫, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2005.3 

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    25pPSA-31 Effect of "stripes" on the Magnetic Excitation Spectra of High-Tc Cu-oxides

  • 25pWF-9 Na_xCoO_2(x～0.30,x～0.50)の中性子散乱(Co系2(超伝導),領域8(強相関系:高温超伝導,強相関f電子系など))

    茂吉 武人, 安井 幸夫, 左右田 稔, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2005.3 

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    25pWF-9 Magnetic Neutron Scattering of Na_xCoO_2 single crystals with x～0.30 and ～0.50

  • 27aTA-6 Nd_2Mo_2O_7の異常Hall効果と磁気構造 : chirality modelは正しいか?(フラストレーション系(パイロクロア・スピネル),領域8(強相関系:高温超伝導,強相関f電子系など))

    安井 幸夫, 影山 健友, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2005.3 

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    27aTA-6 Anomalous Hall Effects and Magnetic Structure of Nd_2Mo_2O_7 : Does the chirality model determine the behavior of the Anomalous Hall Effect of Nd_2Mo_2O_7?

  • 12aRB-6 NdBaCo_2O_5 における電荷秩序ダイナミクス : 中性子散乱(Mn 系 1 : 二重ペロブスカイト・マルチフェロイクス, 領域 8)

    左右田 稔, 安井 幸夫, 飯久 保智, 佐藤 正俊, 加倉 井和久

    日本物理学会講演概要集  2004.8 

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    12aRB-6 Dynamics of Charge Ordering in NdBaCo_2O_5 : Neutron Scattering

  • 12pRC-12 Sr_2MnO_<3 5> の磁気構造(Mn 系_2 : スピン-電荷-軌道結合, 領域 8)

    加藤 千尋, 飯久保 智, 左右田 稔, 佐藤 正俊, 加倉井 和久, 吉居 俊輔

    日本物理学会講演概要集  2004.8 

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    12pRC-12 Magnetic Structure of Sr_2MnO_<3 5>

  • 13aRC-9 Na_xCoO_2 の大型単結晶の作成と中性子散乱(Co 系 1 : 超伝導, 領域 8)

    茂吉 武人, 安井 幸夫, 左右 田稔, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2004.8 

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    13aRC-9 Growth of Large Single Crystals of Na_xCoO_2 and their Neutron Scattering

  • 14pRD-3 La_<1 88>Sr_<0 12>CuO_4 の磁気励起スペクトル(高温超伝導 : 電荷・スピン秩序, 領域 8)

    飯久保 智, 伊藤 雅典, 安井 幸夫, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2004.8 

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    14pRD-3 Magnetic Excitation Spectra of La_<1 88>Sr_<0 12>CuO_4

  • 27aXB-7 層状ロジウム酸化物Na_xRhO_2の合成と磁気・輸送特性(その他の遷移金属化合物)(領域8)

    植松 大輔, 飯久保 智, 小林 義明, 佐藤 正俊

    日本物理学会講演概要集  2004.3 

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    27aXB-7 Synthesis, and Transport and Magnetic properties of Na_xRhO_2

  • 28aXE-7 La_<1.48>Nd_<0.4>Sr_<0.12>CuO_4の高エネルギ-phonon(高温超伝導(磁気秩序,ストライプ))(領域8)

    伊藤 雅典, 飯久保 智, 佐藤 正俊, Reznik Dmitry, Pintschovius Lothar

    日本物理学会講演概要集  2004.3 

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    28aXE-7 High-energy Phonons of La_<1.48>Nd_<0.4>Sr_<0.12>CuO_4

  • 28aXE-8 La_<1.6-x>Nd_<0.4>Sr_xCuO_4の磁気励起スペクトル(高温超伝導(磁気秩序,ストライプ))(領域8)

    飯久保 智, 伊藤 雅典, 安井 幸夫, 左右田 稔, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2004.3 

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    28aXE-8 Magnetic Excitation Spectra of La_<1.6-x>Nd_<0.4>Sr_xCuO_4

  • 28pXC-17 NdBaCo_2O_<5.5>の構造とスピン状態 : 中性子散乱(Co系酸化物)(領域8)

    左右田 稔, 安井 幸夫, 伊藤 雅典, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2004.3 

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    28pXC-17 Structures and Spin States of NdBaCo_2O_<5.5> : Neutron Scattering

  • 20aTR-10 La_<1.42>Nd_<0.4>Sr_<0.18>CuO_4 の磁気励起スペクトル

    飯久保 智, 伊藤 雅典, 安井 幸夫, 左右田 稔, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.8 

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    Magnetic Excitation Spectra of La_<1.42>Nd_<0.4>Sr_<0.18>CuO_4

  • 20aTR-5 高温超伝導体の磁気励起スペクトル : 磁気励起にみる "stripe" の効果

    伊藤 雅典, 安井 幸夫, 飯久保 智, 左右田 稔, 佐藤 正俊, 西 正和, 加倉井 和久

    日本物理学会講演概要集  2003.8 

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    Studies on the Magnetic Excitation Spectra of High-T_e Superconductors

  • 20pTP-5 SrFe_<1-x>Co_xO_3 の中性子散乱

    安井 幸夫, 井戸 貴彦, 飯久保 智, 伊藤 雅典, 左右田 稔, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.8 

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    Neutron Scattering Studies of SrFe_<1-x>Co_xO_3

  • 21pTP-10 Pr_<1-x>Ca_xCoO_3 の圧力誘起金属-絶縁体転移

    藤田 利晃, 宮下 健, 安井 幸夫, 飯久保 智, 左右田 稔, 小林 義明, 佐藤 正俊, 西堀 英治, 坂田 誠, 下条 豊, 石井 慶信, 加倉井 和久

    日本物理学会講演概要集  2003.8 

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    Pressure-induced metal-insulator transition of Pr_<1-x>Ca_xCoO_3

  • 22pTR-10 NdBaCo_2O_<5+x> の構造とスピン状態 : 中性子回折

    左右田 稔, 安井 幸夫, 伊藤 雅典, 飯久保 智, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.8 

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    Structure and Spin State of NdBaCo_2O_<5+x> : Neutron Diffraction

  • 28pWG-1 中性子回折による TbBaCo_2O_<5.5> の逐次相転移の研究

    左右田 稔, 安井 幸夫, 藤田 利晃, 宮下 健, 伊藤 雅典, 飯久保 智, 小林 義明, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.3 

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    Successive Phase Transitions of TbBaCo_2O_<5.5> : Neutron Scattering Study

  • 28pXG-11 Cu_<1-x>Zn_xCr_2Se_4 の磁気構造 : ^<53>Cr-NMR

    小林 義明, 飯久保 智, 大野 陽平, 宮下 健, 佐藤 正俊

    日本物理学会講演概要集  2003.3 

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    magnetic structure of Cu_<1-x>Zn_xCr_2Se_4 : ^<53>Cr-NMR

  • 31aWH-9 銅酸化物高温超伝導体と"ストライプ"について : YBCO 系と La214 系の磁気励起スペクトルの比較から

    伊藤 雅典, 安井 幸夫, 飯久保 智, 左右 田稔, 佐藤 正俊, 西 正和, 加倉井 和久, 李 哲虎, 山田 和芳

    日本物理学会講演概要集  2003.3 

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    Studies on the Magnetic Excitation Spectra of High-Te Superconductors

  • 31pWA-13 パイロクロア型化合物 Nd_2Mo_2O_7 の異常 Hall 効果と磁気構造

    安井 幸夫, 影山 健友, 飯久保 智, 伊藤 雅典, 吉居 俊輔, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.3 

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    Anomalous Hall Effects and Magnetic Structure of Nd_2Mo_2O_7

  • 31pWA-6 Cu_<1-x>Zn_xCr_2Se_4 の磁気構造と異常ホール効果

    飯久保 智, 小林 義明, 大野 陽平, 安井 幸夫, 伊藤 雅典, 左右田 稔, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2003.3 

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    Magnetic Structure and Anomarous Hall Effect of a Cu_<1-x>Zn_xCr_2Se_4

  • 31pWA-7 Cu_<1-x>A_xCr_<2-y>T_ySe_4 の磁性と伝導

    相藤 夏紀, 大野 陽平, 飯久保 智, 小林 義明, 佐藤 正俊

    日本物理学会講演概要集  2003.3 

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    Magnetic and transport properties of Cu_<1-x>A_xCr_<2-y>T_ySe_4

  • 17pTE-14 YBa_2Cu_3O_yのCuO_2面内フォノンの観測と動的"ストライプ"

    伊藤 雅典, 原科 浩, 安井 幸夫, 金田 昌基, 飯久 保智, 佐藤 正俊, 加倉井 和久, 西 正和

    日本物理学会講演概要集  2001.9 

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    Is there any effect of the dynamical "stripes" on the in-plane phonon mode in YBa_2Cu_3O_y ?

  • 18aTE-11 特異な異常Hall効果を示すCr_3Te_4の磁気構造

    原料 浩, 安井 幸夫, 金田 昌基, 飯久保 智, 吉居 俊輔, 小田 啓介, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2001.9 

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    Unconventional Anomalous Hall Effect and the Magnetic Structure of Cr_3Te_4

  • 18aTE-2 パイロクロア型化合物Nd_2Mo_<2-x>Cr_xO_7における磁性と伝導

    影山 健友, 飯久保 智, 近藤 泰幸, 吉居 俊輔, 佐藤 正俊

    日本物理学会講演概要集  2001.9 

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    Magnetic and transport prperties of Nd_2Mo_<2-x>Cr_xO_7

  • 18aTE-3 パイロクロア型化合物Nd_2Mo_2O_7の磁場下の中性子散乱

    安井 幸夫, 影山 健友, 近藤 泰幸, 飯久保 智, 伊藤 雅典, 金田 昌基, 原科 浩, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2001.9 

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    Neutron Scattering Studies of Pyrochlore Compound Nd_2Mo_2O_7 in Magnetic Fields

  • 18pTE-3 スピネル化合物MnCr_2S_4の磁気構造

    近藤 泰幸, 小田 啓介, 飯久保 智, 安井 幸夫, 伊藤 雅典, 金田 昌基, 原科 浩, 佐藤 正俊, 目時 直人

    日本物理学会講演概要集  2001.9 

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    Magnetic Structure of Spinel Compound MnCr_2S_4

  • 19pTE-10 T^*構造をとる高温超伝導体の磁気励起

    飯久保 智, 原科 浩, 伊藤 雅典, 安井 幸夫, 金田 昌基, 安倍 誠, 佐藤 正俊, 加倉井 和久

    日本物理学会講演概要集  2001.9 

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    Language：Japanese  

    Country：Japan  

    Magnetic Excitation of the T^*-Type High-Tc System

  • 27aXB-2 フラストレート系Tb_2Ti_2O_7のスピンダイナミクス

    安井 幸夫, 金田 昌基, 飯久保 智, 伊藤 雅典, 原科 浩, 佐藤 正俊, 奥村 肇, 加倉井 和久, 門脇 広明

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Spin Dynamics of Magnetically Frustrated Pyrochlore System Tb_2Ti_2O_7

  • 27aXB-3 スピンアイス系Ho_2Ti_2O_7の中性子散乱

    金田 昌基, 安井 幸夫, 近藤 泰幸, 飯久保 智, 伊藤 雅典, 原科 浩, 佐藤 正俊, 奥村 肇, 加倉井 和久, 門脇 広明

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Neutron Diffraction Study on the Spin-Ice System Ho_2Ti_2O_7

  • 28aYM-4 パイロクロア型化合物Nd_<2-x>Y_xMi_2M_yO_7(M=Ti、V、W)における異常ホール効果

    影山 健友, 飯久 保智, 近藤 泰幸, 吉居 俊輔, 佐藤 正俊

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Anomalous Hall Effect of Nd_<2-x>Y_xMi_2M_yO_7(M=Ti.V.W)

  • 28aYM-7 MCr_2S_4(DM=Fe, Cu)のホール抵抗

    小田 啓介, 安井 幸夫, 吉居 俊輔, 飯久保 智, 小林 義明, 伊藤 雅典, 原科 浩, 佐藤 正俊

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Hall resistivity of MCr_2S_4(M=Fe, Cu)

  • 28pYL-10 YBa_2Cu_3O_<6.5>の低エネルギー磁気励起におけるインコメンシュレートピーク

    原科 浩, 伊藤 雅典, 金田 昌基, 安井 幸夫, 飯久保 智, 佐藤 正俊, 小林 晃人, 加倉井 和久

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Incommensurate peak in the magnetic excitation spectra of YBa_2Cu_3O_<6.5>

  • 28pYL-7 T^*構造Nd_<1.6・x>Ce_nSr_<0.4>CuO_4における"ストライプ"秩序の存否

    安倍 誠, 飯久保 智, 小林 義明, 佐藤 正俊

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Search for effects of the "stripe" order or fluctuation in T^*-type Cu oxides

  • 28pYL-9 YBa_2Cu_3O_<6.5>のCuO_2面内フォノンの観測と"ストライプ"

    伊藤 雅典, 原科 浩, 安井 幸夫, 金田 昌基, 飯久保 智, 佐藤 正俊, 加倉井 和久, 西 正和

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Non-existence of effects of the dynamical "stripes" on the in-plane phonon mode in YBCO_<6.5>

  • 29pYL-1 T^*構造をとる高温超伝導体の単結晶作成

    飯久保 智, 安倍 誠, 原科 浩, 佐藤 正俊

    日本物理学会講演概要集  2001.3 

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    Language：Japanese  

    Country：Japan  

    Growth of Large Single Crystals of the T^*-Type High-Te System

  • 22aSD-7 パイロクロア型化合物Y_<2-x>R_xMo_2O_7(R=Nd、Eu)におけるMoサイトの磁性と伝導

    影山 健友, 飯久 保智, 小田 啓介, 近藤 泰幸, 吉居 俊輔, 佐藤 正俊

    日本物理学会講演概要集  2000.9 

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    Language：Japanese  

    Country：Japan  

    Transport and Magnetic Properties of Y_<2-x>R_xMo_2O_7(R=Nd,Eu)

  • 22aSD-9 パイロクロア型化合物Y_<2-x>Nd_xMo_2O_7の異常ホール効果

    飯久保 智, 吉居 俊輔, 影山 健友, 小田 啓介, 近藤 泰幸, 村田 一大, 佐藤 正俊

    日本物理学会講演概要集  2000.9 

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    Language：Japanese  

    Country：Japan  

    Anomalous Hall effect of Y_<2-x>Nd_xMo_2O_7

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MISC

  • 結晶PDF解析の最前線 Reviewed

    社本真一, 樹神克明, 飯久保智

    波紋   1900

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • マグネシウム合金の安定性に関する第一原理計算 Reviewed

    飯久保智

    軽金属   1900

    　More details

    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • 第一原理計算の計算状態図への応用

    飯久保智, 徳永辰也, 大谷博司

    セラミックス   1900

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Industrial property rights

Patent   Number of applications: 1   Number of registrations: 0
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • 日本物理学会

  • 中性子科学会

  • 日本金属学会

  • 鉄鋼協会

  • 応用物理学会

Committee Memberships

  • 日本金属学会   広報委員   Foreign country

    2023.4 - 2025.4   

  • 中性子科学会   Organizer   Domestic

    2021.6   

Academic Activities

  • 合金状態図172委員会、委員

    Role(s)： Review, evaluation

    2021.6

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    Type：Scientific advice/Review 

Research Projects

  • Understanding defect structures in organic-inorganic perovskites

    Grant number：24KK0114  2024.9 - 2029.3

    Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (International Collaborative Research)

    飯久保 智, 嶋田 雄介, 井原 史朗

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    Grant type：Scientific research funding

    本提案は鉛フリーペロブスカイト（PVK）光電変換素子の高効率化に関する基礎研究である。これまでの報告ではSn-PVKの効率は10%程度と低く、結晶中に存在する欠陥が高効率化のための足かせとなっていた。我々は計算科学と先端計測により結晶中の欠陥、それに伴う局所歪みの詳細を明らかにする。目標達成のため、世界を先導する電子顕微鏡センターを有するアントワープ大学との国際共同研究者チームを形成する。

    CiNii Research

  • SnからなるPbフリーペロブスカイト太陽電池の開発

    2023.5 - 2026.3

  • グリーンイノベーション基金事業/次世代型太陽電池の開発

    2023.5 - 2026.3

  • 高圧巨大ひずみ加工による光触媒性酸化亜鉛(ZnO)の高性能化

    Grant number：23K04374  2023.4 - 2026.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    唐 永鵬, 飯久保 智

    　 More details

    Grant type：Scientific research funding

    本研究では、半導体酸化亜鉛(ZnO)の高圧相であるRocksalt構造を常圧にもたらし、可視光により高効率で水分解する光触媒材料を開発する。また、高圧で安定なRocksalt相を常圧下にもたらすことのできるメカニズムとその支配因子（圧力、温度、ひずみ）の解明を行う。
    また、密度汎関数理論（DFT）を用いた計算科学により、高圧相の安定性やバンドギャップの空孔濃度依存性を調べ、さらに可視光による水分解で水素ガスの発生高効率を調べる。

    CiNii Research

  • 高圧場を利用した新規Mg合金の探索

    Grant number：22K04670  2022.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    松下 正史, 飯久保 智

    　 More details

    Grant type：Scientific research funding

    マグネシウム合金を対象とし、高圧を利用した新規結晶構造と特異なマイクロストラクチャーの作製に取り組む。金属の結晶構造は原子サイズやmixing、enthalpyなどに左右される。ここにに圧力による歪の効果を加えて新規結晶構造の探索を行う。従来、技術的な困難さから、圧力をパラメータとした合金の研究は少ない。本研究によって金属材料の新しい局面を切り開くことに当選する。また、計算科学分野では第一原理計算とクラスター展開法を組み合わせた構造予測を試みる手法が成果を上げている。本研究では計算範囲を高圧にまで広げて実験との差を明らかにする。高圧実験と計算物質科学を組み合わせ、新物質探索の指針獲得を目指す。

    CiNii Research

  • Fabrication of n-type halide perovskite thin films towards energy harvesting

    Grant number：22K04187  2022.4 - 2025.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    サイニ シリカント, 飯久保 智

    　 More details

    Grant type：Scientific research funding

    CiNii Research

  • 電気自動車用革新型蓄電池開発(RISING3)

    2021.6

    　 More details

    Authorship：Coinvestigator(s) 

  • Study of defect structure in tin-based perovskites using complementary quantum beams

    Grant number：20H02848  2020.4 - 2024.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Iikubo Satoshi

    　 More details

    Grant type：Scientific research funding

    In local structure analysis using XAFS data, etc., no deviation from the crystal structure of MASnX3 (X = Cl, Br, I) could be confirmed, and it became clear that the local distortion caused by the defect structure was so small that it was difficult to observe. XAFS analysis of the reagents used for sample synthesis revealed that some of the Sn2+ in SnBr2 may have changed to Sn4+, so it is necessary to prevent Sn oxidation during synthesis.
    As a result of calculating the defect formation energy of MASnX3, we found that the formation energies of Sn vacancies and interstitial Cl, Br, and I are low and stable. Also, unlike MASnI3, the formation energy of interstitial Cl and interstitial Br was lower than that of Sn vacancies. From the calculated result, it was found that Sn vacancies are most likely to enter in MASnI3, and interstitial Cl and interstitial Br are most likely to enter in MASnCl3 and MASnBr3.

    CiNii Research

  • Study on Local Structural Disorder in Fuel Cell Battery Materials using Combining Quantum Beam Scattering and Computational Simulation

    Grant number：19K05070  2019.4 - 2023.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    IGAWA Naoki

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    Grant type：Scientific research funding

    We analyzed the average structure and local structure of solid electrolytes for fuel cell-battery by combining the diffraction method, the atomic pair correlation function analysis method using quantum beams, and the first-principles calculation simulation. We found that when the hydrogen atom is placed near the oxygen atom, it has a lower energy and a more stable structure. Also, the trivalent cation and the tetravalent cation occupy the same crystal site, but the first-principles calculation simulation shows that the trivalent cation-oxygen distance is longer than the tetravalent cation-oxygen distance. It indicates that the local distortion occurs in the crystal structure. This study has made it possible to analyze the crystal position of hydrogen and crystal disorder in the solid electrolyte.

    CiNii Research

  • 新規な負極材料の合成、層間制御及びナトリウムイオン電池の充放電性能の改善

    Grant number：19H02818 

    馬 廷麗, 飯久保 智

    　 More details

    Grant type：Scientific research funding

    近年、ナトリウムイオン二次電池（SIBs）は、Naの資源的問題が無く、低コストであるため、大型蓄電デバイスの有力候補となっている。しかし、現在まで報告されたSIBsはNa+の吸蔵・放出が電極材料により制限され、その性能が低くて、実用化は難しい。本研究は優れた導電性、高い耐熱性及び構造の安定性をもつ新規な２Ｄ原子層材料のナノ空間を制御し、高性能のSIBsを創生することが目的である。本提案では、新規な複合炭化物を合成し、独自な方法でエッチングを行う。更に、ナノ空間を制御し、Na+の挿入、脱離機構を解明する。従来のSIBsより高いエネルギー容量及び優れた耐久性をもつナトリウムイオン電池を創生する。

    CiNii Research

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Educational Activities

  • 大学院教育は総合理工学府、学部教育は工学部　エネルギー科学科と融合基礎工学科を担当する。

Class subject

  • 融合基礎情報学Ⅰ

    2024.10 - 2025.3   Second semester

  • エネルギー科学特別講義Ⅴ（融合基礎工学特別講義A）

    2024.4 - 2025.3   Full year

  • 工学概論（Ⅱ群）

    2024.4 - 2024.9   First semester

  • 現代物理学基礎

    2024.4 - 2024.9   First semester

  • 融合基礎工学特別講義A

    2024.4 - 2024.9   First semester

  • 量子力学（S2-16）

    2024.4 - 2024.9   First semester

  • 融合応用情報学D

    2024.4 - 2024.6   Spring quarter

  • エネルギー工学演習（融合応用情報学D）

    2024.4 - 2024.6   Spring quarter

  • 融合基礎情報学Ⅰ

    2023.10 - 2024.3   Second semester

  • 総合理工学修士演習

    2023.4 - 2024.3   Full year

  • エネルギー科学特別講義Ⅶ（朝岡　秀人）

    2023.4 - 2024.3   Full year

  • 総合理工学修士演習

    2023.4 - 2024.3   Full year

  • 総合理工学修士実験

    2023.4 - 2024.3   Full year

  • 量子力学（S2-16）

    2023.4 - 2023.9   First semester

  • 現代物理学基礎

    2023.4 - 2023.9   First semester

  • 融合基礎情報学Ⅰ

    2022.10 - 2023.3   Second semester

  • 総合理工学修士演習

    2022.4 - 2023.3   Full year

  • 総合理工学修士実験

    2022.4 - 2023.3   Full year

  • 量子力学（S2-16）

    2022.4 - 2022.9   First semester

  • 異分野特別演習

    2021.12 - 2022.2   Winter quarter

  • 金属材料学Ⅱ

    2021.12 - 2022.2   Winter quarter

  • 金属材料学I

    2021.10 - 2022.3   Second semester

  • 金属材料学

    2021.10 - 2022.3   Second semester

  • 金属材料学Ⅰ

    2021.10 - 2021.12   Fall quarter

  • 先端材料解析学i

    2021.6 - 2021.8   Summer quarter

  • 先端材料解析学 i

    2021.6 - 2021.8   Summer quarter

  • 融合基礎情報学Ⅰ

    2025.10 - 2026.3   Second semester

  • 総合理工学博士論文演習

    2025.4 - 2026.3   Full year

  • 量子力学（S2-16）

    2025.4 - 2025.9   First semester

  • グローバル科目Ⅱ（討論）

    2025.4 - 2025.9   First semester

  • 融合応用情報学D

    2025.4 - 2025.6   Spring quarter

  • 融合基礎情報学Ⅰ

    2024.10 - 2025.3   Second semester

  • エネルギー工学演習（融合基礎情報学Ⅰ）

    2024.10 - 2025.3   Second semester

  • エネルギー科学特別講義Ⅴ（融合基礎工学特別講義A）

    2024.4 - 2025.3   Full year

  • 量子力学（S2-16）

    2024.4 - 2024.9   First semester

  • 融合基礎工学特別講義A

    2024.4 - 2024.9   First semester

  • 現代物理学基礎

    2024.4 - 2024.9   First semester

  • 工学概論（Ⅱ群）

    2024.4 - 2024.9   First semester

  • 融合応用情報学D

    2024.4 - 2024.6   Spring quarter

  • 工学倫理（Ⅱ群）

    2024.4 - 2024.6   Spring quarter

  • エネルギー工学演習（融合応用情報学D）

    2024.4 - 2024.6   Spring quarter

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2021  九州工業大学・マテリアル工学科  Classification:Part-time lecturer  Domestic/International Classification:Japan 

Media Coverage

  • 水素添加で変化抑制　鉄鋼材の結晶構造　九州工大など発見 Newspaper, magazine

    日刊工業新聞  2018.11

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    水素添加で変化抑制　鉄鋼材の結晶構造　九州工大など発見

  • 大学院生命体工学研究科の飯久保智准教授の研究室の論文が学術誌に掲載され、その研究成果に関することが取材されました。 TV or radio program

    NHK  2018.10

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    大学院生命体工学研究科の飯久保智准教授の研究室の論文が学術誌に掲載され、その研究成果に関することが取材されました。

  • 九大と九州工大、鉄鋼材料において水素による異常な変態抑制効果を発見 Newspaper, magazine

    日本経済新聞  2018.10

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    九大と九州工大、鉄鋼材料において水素による異常な変態抑制効果を発見

Travel Abroad

  • 2021.6

    Staying countory name 1：Netherlands   Staying institution name 1：デルフト工科大学