Updated on 2026/04/28

Information

 

写真a

 
HASHIKUNI KATSUAKI
 
Organization
Faculty of Engineering Department of Mechanical Engineering Assistant Professor
School of Engineering Department of Mechanical Engineering（Concurrent）
Graduate School of Engineering Department of Hydrogen Energy Systems（Concurrent）
International Institute for Carbon-Neutral Energy Research Multiscale Science and Engineering for Energy and the Environment Thrust（Concurrent）
Title
Assistant Professor
Contact information
メールアドレス
Homepage
External link

Research Areas

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Energy chemistry

Degree

  • Doctor of Science （ 2021.3 Kyushu University ）

Research History

  • Kyushu University Faculty of Engineering Assistant Professor 

    2024.4 - Present

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  • Sanyo-Onoda City University Faculty of Engineering Department of Electrical Engineering Assistant Professor 

    2021.4 - 2024.3

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    Country：Japan

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  • 日本学術振興会特別研究員 (DC2)   

    2019.4 - 2021.3

Education

  • Kyushu University   総合理工学府   量子プロセス理工学専攻

    2018.4 - 2021.3

  • Hiroshima University   先端物質科学研究科   量子物質科学専攻

    2016.4 - 2018.3

  • Hiroshima University   理学部   物理科学科

    2012.4 - 2016.3

Research Interests・Research Keywords

  • Research theme： Natural Hydrogen Production

    Keyword： Natural Hydrogen, Olivine, Serpentinization

    Research period： 2024.4 - Present

  • Research theme： Thermoelectric

    Keyword： thermoelectric properties, sulfide, thiospinel, skutterudite

    Research period： 2015.4 - Present

Awards

  • エスペック環境研究奨励賞

    2025.8   エスペック株式会社   人工かんらん石を用いた水の熱化学分解による水素生成技術の開発

    橋國克明

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    Award type：Award from publisher, newspaper, foundation, etc. 

  • 優秀講演賞

    2016.9   日本熱電学会   「N型チオスピネルCu2MTi3S8 (M = Mn, Fe, Co, Ni)の熱電物性と電子構造」， 第13回日本熱電学会学術講演会，東京

  • The ITS Outstanding Poster Award

    2016.6   International Thermoelectric Society   "Cu2MTi3S8 (M = Mn, Fe, Co, Ni) thiospinels: environmentally benign n-type thermoelectric materials", The 35th International Conference & The 1st Asian Conference on Thermoelectrics, Wuhan (China).

Papers

  • A comparative study of thermoelectric Cu2TrTi3S8 (Tr = Co and Sc) thiospinels: Enhanced Seebeck coefficient via electronic structure modification Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, and Michitaka Ohtaki

    Journal of Alloys and Compounds   871   159548   2021.3

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

    DOI： https://doi.org/10.1016/j.jallcom.2021.159548

    Repository Public URL： https://hdl.handle.net/2324/7347402

  • Thermoelectric Properties and Electronic Structures of CuTi2S4 Thiospinel and Its Derivatives: Structural Design for Spinel-Related Thermoelectric Materials Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    Inorganic Chemistry   58 ( 2 )   1425 - 1432   2019.1

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

    DOI： https://doi.org/10.1021/acs.inorgchem.8b02955

    Repository Public URL： https://hdl.handle.net/2324/7347404

  • Carrier concentration tuning in thermoelectric thiospinel Cu2CoTi3S8 by oxidative extraction of copper Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, Toshiro Takabatake

    Journal of Solid State Chemistry   259   5 - 10   2017.12

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

    DOI： https://doi.org/10.1016/j.jssc.2017.12.031

    Repository Public URL： https://hdl.handle.net/2324/7347408

  • High power factor in thiospinels Cu2TrTi3S8 (Tr = Mn, Fe, Co, Ni) arising from TiS6 octahedron network Reviewed International journal

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    Applied Physics Letters   109 ( 18 )   182110   2016.11

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

    DOI： https://doi.org/10.1063/1.4966955

    Repository Public URL： https://hdl.handle.net/2324/7347426

  • Non-contact Measurements of Thermal Diffusivity Using High-Speed Infrared Camera Reviewed

    Marcos Vinicius Cerri Silva, Takumi Pascal Shimizu, Atsuki Okada, Katsuaki Hashikuni, Koji Miyazaki

    International Journal of Thermophysics   47 ( 5 )   75   2026.4   （ ISSN:0195-928X eISSN:1572-9567 ）

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

    We carried out non-contact measurements of thermal diffusivity in air using the Angström method with an infrared camera, specifically for small samples to which temperature sensors cannot be attached. Thermal diffusivities of an alumina plate, a skutterudite plate, a glass fiber, and a silk fiber were successfully measured, and the influence of heat loss on the measurements was investigated. In the analysis, a model assuming a constant heat transfer coefficient to the air was employed, and the validity of the method was confirmed by comparing the measured values with literature data. The limitations of the constant heat transfer coefficient model under unsteady state conditions were also clarified. The results show that the present heat-loss model is sufficient for practical measurements of thermal diffusivity in air. Furthermore, this approach enables a quantitative assessment of whether vacuum conditions are necessary for accurate measurements.

    DOI： 10.1007/s10765-026-03750-6

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    Other Link： https://link.springer.com/article/10.1007/s10765-026-03750-6

  • Development of a High-Density coating film of CoSb3

    OGASAWARA Shimon, IYO Keito, WATANABE Kosuke, HASHIKUNI Katsuaki, MIYAZAKI Koji

    2025.3

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    Language：Japanese  

    熱工学1 : 413

    CiNii Research

  • Synthesis of the Olivine for Hydrogen Production

    SATAKE Temma, HASHIKUNI Katsuaki, WATANABE Kosuke, MIYAZAKI Koji

    2025.3

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    Language：Japanese  

    機械材料・材料加工 : 347

    CiNii Research

  • 密度汎関数理論によるGa-P同時ドープBa8Cu6Ge40クラスレートの電子構造の研究 Reviewed

    阿武宏明, 橋國克明

    山陽小野田市立山口東京理科大学紀要   7   21 - 26   2024.3

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    Publishing type：Research paper (bulletin of university, research institution)  

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    Repository Public URL： https://hdl.handle.net/2324/7347441

  • スクッテルダイトCoSb3の電子構造と輸送特性 Reviewed

    阿武宏明，橋國克明

    山陽小野田市立山口東京理科大学紀要   6   23 - 30   2023.4

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Repository Public URL： https://hdl.handle.net/2324/7347433

  • An effective synthesis route for high-performance α-MgAgSb thermoelectric material Reviewed

    Keita Toh, Koichiro Suekuni, Katsuaki Hashikuni, Hirotaka Nishiate, Ushin Anazawa, Chul-Ho Lee, Michitaka Ohtaki

    Journal of Materials Science   57 ( 24 )   11265 - 11273   2022.6   （ ISSN:0022-2461 eISSN:1573-4803 ）

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

    α-MgAgSb has been receiving attention as a thermoelectric material due to its high performance at 300–550 K. A MgAgSb sample synthesized by melting the constituent elements is known to contain secondary phases, which can be diminished by long-term heat treatment. However, less effort has been devoted to investigating the secondary phases and exploring an effective synthesis route to improve the sample purity. In this work, we showed that an as-melted sample comprised α-MgAgSb and large amounts of Ag3Sb and Mg4AgSb3. The secondary phases were successfully diminished/reacted through short-term ball milling and sintering processes. Secondary phases were further reduced by decreasing the starting Ag content, leading to the enhanced dimensionless figure of merit ZT of 0.4 at 300 K and 0.7 at 450 K. The synthesis route without long-term heat treatment is expected to contribute to efficient production of α-MgAgSb. Graphical abstract: [Figure not available: see fulltext.]

    DOI： 10.1007/s10853-022-07306-5

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    Other Link： https://link.springer.com/article/10.1007/s10853-022-07306-5/fulltext.html

  • 密度汎関数理論計算によるBa8Cu6Ge40クラスレートの電子構造と輸送特性 Reviewed

    阿武宏明，橋國克明

    山陽小野田市立山口東京理科大学紀要   5   9 - 16   2022.4

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    Repository Public URL： https://hdl.handle.net/2324/7347437

  • Thermoelectric quaternary sulfide Cu2+xZn1−xSnS4 (x = 0–0.3): Effects of Cu substitution for Zn Reviewed International journal

    Bui Duc Long, Le Hong Thang, Nguyen Hong Hai, Koichiro Suekuni, Katsuaki Hashikuni, Tran Quang Minh Nhat, Wojciech Klich, Michitaka Ohtaki

    Materials Science & Engineering B   272   115353   2021.10

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

    DOI： https://doi.org/10.1016/j.mseb.2021.115353

  • Key Role of d0 and d10 Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32 Compounds Reviewed International journal

    Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Andrew R. Supka, Raju Chetty, Emmanuel Guilmeau, Bernard Raveau, Marco Fornari, Michihiro Ohta, Rabih Al Rahal Al Orabi, Hikaru Saito, Katsuaki Hashikuni, Michitaka Ohtaki

    Chemistry of Materials   33 ( 9 )   3449 - 3456   2021.4

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

    DOI： https://doi.org/10.1021/acs.chemmater.1c00872

  • Electronic structure and thermoelectric properties of Sn1.2−xNbxTi0.8S3 with a quasi-one-dimensional structure Reviewed International journal

    Koichiro Suekuni, Hidetomo Usui, Siying Qiao, Katsuaki Hashikuni, Tatsuya Hirano, Hirotaka Nishiate, Chul-Ho Lee, Kazuhiko Kuroki, Kosuke Watanabe, Michitaka Ohtaki

    Journal of Applied Physics   125   175111   2019.5

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

    DOI： https://doi.org/10.1063/1.5093183

  • Atomic-scale phonon scatterers in thermoelectric colusites with a tetrahedral framework structure Reviewed International journal

    Koishiro Suekuni, Yuta Shimizu, Eiji Nishibori, Hidetaka Kasai, Hikaru Saito, Daichi Yoshimoto, Katsuaki Hashikuni, Yohan Bouyrie, Raju Chetty, Michihiro Ohta, Emmanuel Guilmeau, Toshiro Takabatake, Kosuke Watanabe, Michitaka Ohtaki

    Journal of Materials Chemistry A   7   228 - 235   2018.11

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

    DOI： https://doi.org/10.1039/C8TA08248K

  • Retreat from Stress: Rattling in a Planar Coordination Reviewed International journal

    Koichiro Suekuni, Chul Ho Lee, Hiromi I. Tanaka, Eiji Nishibori, Atsushi Nakamura, Hidetaka Kasai, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Takumi Hasegawa, Mitsutaka Nakamura, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Koji Kaneko, Hirotaka Nishiate, Katsuaki Hashikuni, Yasufumi Kosaka, Kazuhiko Kuroki, Toshiro Takabatake

    Advanced Materials   30 ( 13 )   1706230   2018.2

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

    DOI： https://doi.org/10.1002/adma.201706230

  • Effects of Ge and Sb substitution on the metal-semiconductor transition and thermoelectric properties of Cu12Sb4S13 tetrahedrite Reviewed International journal

    Yasufumi Kosaka, Koichiro Suekuni, Katsuaki Hashikuni, Yohan Bouyrie, Michihiro Ohta, Toshiro Takabatake

    Physical Chemistry Chemical Physics   19   8874 - 8879   2016.3

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

    DOI： https://doi.org/10.1039/C7CP00351J

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Presentations

  • 高速度赤外線カメラによる大気中非接触熱拡散率測定

    セヒシルバマルコスヴィニシウス，清水匠パスカル，岡田敬生，橋國克明，宮崎康次

    日本機械学会九州支部 九州学生会 第57回学生員卒業研究発表講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎市  

  • 硫酸バリウム放射冷却面の伝熱特性

    甲斐雄大，ランザトゥソン メッシー，橋國克明，宮崎康次

    日本機械学会九州支部 九州学生会 第57回学生員卒業研究発表講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎市  

  • 超音波破砕粒子による熱電塗布膜の高充填化

    兼平陽生，岡田敬生，橋國克明，渡邊厚介，宮崎康次

    日本機械学会九州支部 九州学生会 第57回学生員卒業研究発表講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎市  

  • 天然水素生成の地球化学モデリング解析

    竹綱俊祐，橋國克明，佐竹天馬，宮崎康次

    日本機械学会九州支部 九州学生会 第57回学生員卒業研究発表講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎市  

  • 分子動力学法によるタングステンのフォノン分散関係解析

    伊藤礼惟，近藤周吾，橋國克明，宮崎康次

    日本機械学会九州支部 九州学生会 第57回学生員卒業研究発表講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長崎市  

  • Molecular dynamics simulations of interfacial thermal resistance between Bi2Te3 and CsSnI3 International coauthorship International conference

    Koji Miyazaki, Kosuke Watanabe, Katsuaki Hashikuni, Qing Wang, Satoshi Iikubo

    Materials Research Meeting 2025  2025.12 

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    Event date： 2025.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Yokohama   Country：Japan  

  • 人工かんらん石の熱化学反応による水素生成

    佐竹天馬，橋國克明，竹綱俊祐，宮崎康次

    第16回マイクロ・ナノ工学シンポジウム  2025.11  日本機械学会マイクロ・ナノ部門

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    Event date： 2025.11

    Language：Japanese   Presentation type：Poster presentation  

    Venue：宇都宮市  

  • 低温廃熱の有効利用を目指した石ころの活用法 Invited

    橋國克明

    化学工学会エネルギー部会熱利用分科会第13回若手セミナー  2025.11  化学工学会エネルギー部会熱利用分科会

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    Event date： 2025.11

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：福岡市，オンライン (ハイブリッド)  

  • Non-contact measurements of thermal diffusivity using high-speed infrared camera International conference

    Koji Miyazaki, Marcos Vinicius Cerri Silva, Takumi Pascal Shimizu, Atsuki Okada, Katsuaki Hashikuni

    The 14th Asian Thermophysical Properites Conference  2025.10 

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    Event date： 2025.10

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Shanghai   Country：China  

  • 高速度赤外線カメラを用いた熱拡散率の非接触測定

    セヒシルバマルコスヴィニシウス，清水匠パスカル，岡田敬生，橋國克明，宮崎康次

    第46回日本熱物性シンポジウム  2025.10  日本熱物性学会

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    Event date： 2025.10

    Language：English   Presentation type：Oral presentation (general)  

    Venue：佐賀市  

  • 高充填化による熱電塗布膜の特性向上

    岡田敬生，兼平陽生，橋國克明，渡邊厚介，宮崎康次

    日本機械学会 熱工学コンファレンス2025  2025.10  日本機械学会

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    Event date： 2025.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：山形市  

  • フレキシブル熱電モジュールの出力特性

    小笠原史門，米田卓郎，橋國克明，渡邊厚介，宮崎康次

    日本機械学会 熱工学コンファレンス2025  2025.10  日本機械学会

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    Event date： 2025.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：山形市  

  • スクッテルダイト型硫化物Co2Ge3S3の熱電特性に対するSe置換効果

    橋國克明，阿武宏明，宮崎康次

    第22回日本熱電学会学術講演会  2025.9  日本熱電学会

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：小松  

  • 多種球充填の導入による熱電塗布膜の性能向上

    岡田敬生，兼平陽生，橋國克明，渡邊厚介，宮崎康次

    第22回日本熱電学会学術講演会  2025.9  日本熱電学会

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：小松  

  • Non-Contact Thermal Diffusivity Measurements with Infrared Microscopy

    Takumi Pascal Shimizu, Hitoshi Jono, Katsuaki Hashikuni, Kosaku Kurata, Kazuyuki Matsuhira, Koji Miyazaki

    The 35th International Symposium on Transport Phenomena  2025.9 

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    Event date： 2025.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Busan   Country：Korea, Republic of  

  • Effect of Se-substitution on thermoelectric properties of Co2Ge3S3 International conference

    Katsuaki Hashikuni, Koji Miyazaki, Hiroaki Anno

    The 41th International and 7th Asian Conference on Thermoelectrics (ICT/ACT2025)  2025.6  International Thermoelectric Society

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    Event date： 2025.6

    Language：English   Presentation type：Poster presentation  

    Venue：Sendai   Country：Japan  

  • Thermoelectric properties of Fe-substituted Ba8Au6Ge40 clathrate International conference

    Hiroaki Anno, Yudai Koga, Yusuke Nakatani, Katsuaki Hashikuni

    The 41st International and 7th Asian Conference on Thermoelectrics (ICT/ACT2025)  2025.6  International Thermoelectric Society

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    Event date： 2025.6

    Language：English   Presentation type：Poster presentation  

    Venue：Sendai   Country：Japan  

  • Thermoelectric properties of coating film of CoSb3

    Katsuaki Hashikuni, Shimon Ogasawara, Keito Iyo, Kosuke Watanabe, Koji Miyazaki

    The 9th Phonon Engineering Workshop  2025.5 

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    Event date： 2025.5

    Language：English   Presentation type：Poster presentation  

    Venue：宮古島市  

  • 人工かんらん石を用いた熱化学反応による水素生成

    橋國克明，佐竹天馬，渡邊厚介，宮﨑康次

    第62回日本伝熱シンポジウム  2025.5 

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    Event date： 2025.5

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：宜野湾市  

    Repository Public URL： https://hdl.handle.net/2324/7363933

  • Radiative Cooling Performance of Screen-Printed BaSO4 Films International conference

    Messie Ranjatoson, Kosuke Watanabe, Katsuaki Hashikuni, Koji Miyazaki

    HTSJ International Heat Transfer Symposium  2025.5 

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    Event date： 2025.5

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Okinawa   Country：Japan  

  • N型CoSb3ナノ粒子とCNTとのハイブリッド熱電材料の創製

    金光倫玖，橋國克明，阿武宏明

    第72回応用物理学会春季学術講演会  2025.3  応用物理学会

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：野田市  

  • Development of a High-Density coating film of CoSb3

    Shimon Ogasawara, Keito Iyo, Kosuke Watanabe, Katsuaki Hashikuni, Koji Miyazaki

    日本機械学会九州支部九州学生会第56回学生員卒業研究発表講演会  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大分市  

    Repository Public URL： https://hdl.handle.net/2324/7347432

  • Synthesis of the Olivine for Hydrogen Production

    Temma Satake, Katsuaki Hashikuni, Kosuke Watanabe, Koji Miyazaki

    日本機械学会九州支部九州学生会第56回学生員卒業研究発表講演会  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大分市  

    Repository Public URL： https://hdl.handle.net/2324/7347430

  • プリンタブル半導体薄膜の熱電特性

    宮崎康次，橋國克明，伊豫慧斗，小笠原史門，渡邊厚介

    日本機械学会　情報・知能・精密機器部門講演会(IIP2025)  2025.3 

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    Event date： 2025.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：宇部市  

  • Thermoelectric Properties of a Printed Thermoelectric Film of Cobalt Antimonide International conference

    Koji Miyazaki, Keito Iyo, Kosuke Watanabe, Katsuaki Hashikuni

    The 3rd Pacific Rim Thermal Engineering Conference (PRTEC2024)  2024.12 

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    Event date： 2024.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Honolulu   Country：United States  

  • 石ころを活用した低温廃熱の有効利用 Invited

    橋國克明

    令和6年度(2024)九州伝熱セミナー  2024.11 

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    Event date： 2024.11

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：由布市  

  • Development of a printed thermoelectric film of Cobalt Antimonide International conference

    Koji Miyazaki, Keito Iyo, Kosuke Watanabe, Katsuaki Hashikuni

    The 34th International Symposium on Transport Phenomena  2024.11 

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    Event date： 2024.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Taoyuan   Country：Taiwan, Province of China  

  • p型CoSb3系から成る熱電塗布膜の高性能化

    伊豫慧斗, 渡邊厚介, 清水匠パスカル, 橋國克明, Mele Paolo, 森孝雄, 宮崎康次

    第21回日本熱電学会学術講演会  2024.9  日本熱電学会

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    Event date： 2024.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：つくば市  

    researchmap

  • Performance Evaluation of BaSO4 Printed Films by Figure of Merit International conference

    Messie Ranjatoson, Renjiro Emoto, Katsuaki Hashikuni, Kosuke Watanabe, Koji Miyazaki

    5th International Workshop on Nano-Micro Thermal Radiation  2024.7 

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    Event date： 2024.7

    Language：English   Presentation type：Poster presentation  

    Venue：Sapporo   Country：Japan  

  • Stable Carrier Control of Carbon Nanotubes Using Electric Double Layer Electrets International conference

    Katsuaki Hashikuni, Ryu Inoue, Hiroaki Anno

    40th International & 20th European Conference on Thermoelectrics  2024.7 

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    Event date： 2024.6 - 2024.7

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  • Effect of difference in particle size due to different synthesis conditions on thermoelectric properties of Co2Ge3S3

    Katsuaki Hashikuni, Hiroaki Anno

    The 8th Phonon Engineering Workshop  2024.5 

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    Event date： 2024.5

    Language：English   Presentation type：Poster presentation  

    Venue：宮古島市  

  • 真空熱処理によるカーボンナノチューブのpn極性変化と熱電特性

    金光倫玖，橋國克明，阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北九州   Country：Japan  

  • 電気二重層エレクトレットを利用したカーボンナノチューブのキャリア制御

    井上竜，橋國克明，阿武宏明

    第20回日本熱電学会学術講演会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：北九州   Country：Japan  

  • The influence of preparation conditions on thermoelectric properties of skutterudite-related Co2Ge3S3 International conference

    Katsuaki Hashikuni, Hiroaki Anno

    The 39th Annual International Conference on Thermoelectrics  2023.6 

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    Event date： 2023.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Seattle   Country：United States  

  • スクッテルダイト型硫化物Co2Ge3S3の合成条件と熱電特性

    橋國克明，阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Ba8Au6−xFexGe40クラスレートの熱電特性

    中谷祐介，橋國克明，阿武宏明

    第70回応用物理学会春季学術講演会  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Co2Ge3S3の熱電物性に及ぼす出発原料形状の影響

    橋國克明，阿武宏明

    第19回日本熱電学会学術講演会  2022.8 

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    Event date： 2022.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：長岡   Country：Japan  

  • 密度汎関数理論による2次元遷移金属ダイカルコゲナイドの熱電特性の層厚依存性の研究

    吉田大貴，橋國克明，阿武宏明

    2022年度応用物理・物理系学会中国四国支部合同学術講演会  2022.7 

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    Event date： 2022.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：高松   Country：Japan  

  • Thermoelectric properties of two-dimensional titanium disulfide nanosheets studied by density functional theory International conference

    Daiki Yoshida, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Effects of heat treatment on thermoelectric properties of carbon nanotube thin films by spin coating method International conference

    Ryu Inoue, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Thermoelectric properties in composites of germanium and silicon-based clathrate by planetary ball milling International conference

    Hirotaka Ishizu, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2022  2022.7 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Ba8Cu6Ge40クラスレートにおける欠陥の熱電特性へ及ぼす影響

    阿武宏明，橋國克明

    第69回応用物理学会春季学術講演会  2022.3 

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    Event date： 2022.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：相模原   Country：Japan  

  • Thermoelectric Properties of p-type Ba8Au6Ge40 Clathrate International conference

    Yudai Koga, Katsuaki Hashikuni, Hiroaki Anno

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Electronic structure modification for increasing the Seebeck coefficient of Cu2Ti4S8 International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • Thermoelectric properties of carbon nanotubes carrier-tuned by electric double layer techniques International conference

    Haruka Yoshida, Katsuaki Hashikuni, Hiroaki Anno

    1st Japan-France Virtual Workshop on Thermoelectrics  2021.9 

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    Event date： 2021.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • p型Ba8CuxGe46−xクラスレートの熱電物性における最適キャリア濃度の推定

    古賀雄大，橋國克明，阿武宏明

    第18回日本熱電学会学術講演会  2021.8 

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    Event date： 2021.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • カーボンナノチューブにおける電気二重層技術による熱電特性の制御と最適化

    吉田はるか，橋國克明，阿武宏明

    第18回日本熱電学会学術講演会  2021.8 

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    Event date： 2021.8

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 電気二重層技術によりキャリア制御したカーボンナノチューブの熱電特性

    吉田はるか，橋國克明，阿武宏明

    2021年度応用物理・物理系学会中国四国支部合同学術講演会  2021.7 

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    Event date： 2021.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • p型Ge系クラスレート半導体における熱電特性Cu組成依存性

    古賀雄大，橋國克明，阿武宏明

    2021年度応用物理・物理系学会中国四国支部合同学術講演会  2021.7 

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    Event date： 2021.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • Investigation of synthesis and thermoelectric properties for p-type Ge clathrate by Cu substitution International conference

    Yudai Koga, Katsuaki Hashikuni, Hiroaki Anno

    Virtual Conference on Thermoelectrics 2021  2021.7 

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    Event date： 2021.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Other  

  • 室温熱電材料α-MgAgSbの溶融法による合成条件の検討

    藤啓太，末國晃一郎，橋國克明，穴沢卯進，西当弘隆，李哲虎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 新規な高性能熱電銅硫化物Cu26Ti2Sb6−xGexS32

    萩原岳志，末國晃一郎，橋國克明，Chetty Raju，太田道広，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 硫化スピネルCu2Ti4S8の電子構造制御によるゼーベック係数の増大

    橋國克明，末國晃一郎，臼井秀知，Chetty Raju，太田道広，高畠敏郎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 室温熱電材料α-MgAgSbのホットプレスによる焼結体作製条件の検討

    末國晃一郎，藤啓太，橋國克明，穴沢卯進，西当弘隆，李哲虎，大瀧倫卓

    第17回日本熱電学会学術講演会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • n型熱電材料として有望なTi-S系スピネル化合物 Invited

    橋國克明

    日本熱電学会第25回研究会  2020.3 

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    Event date： 2020.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 硫化スピネルCu2FeTi3S8の結晶構造と熱電物性に対するCu欠損効果

    橋國克明，末國晃一郎，Chetty Raju，太田道広，高畠敏郎，大瀧倫卓

    第16回日本熱電学会学術講演会  2019.9 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋   Country：Japan  

  • Rhombohedral CuTi2S4: a thiospinel-derived thermoelectric material International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake, Kosuke Watanabe, Michitaka Ohtaki

    The 38th International Conference on Thermoelectrics and The 4th Asian Conference on Thermoelectrics  2019.7 

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    Event date： 2019.6 - 2019.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Gyongju   Country：Korea, Republic of  

  • Cu 2p-1s X線発光分光によるCu12As4S13の金属半導体転移の研究

    松本拓真，前田和大，佐藤仁，末國晃一郎，橋國克明，高畠敏郎，河村直己

    日本物理学会第74回年次大会  2019.3 

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    Event date： 2019.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：福岡   Country：Japan  

  • 硫化スピネルCu2Ti4S8の結晶構造と電子構造および熱電物性に対するCu欠損効果

    橋國克明，末國晃一郎，臼井秀知，Chetty Raju，太田道広，黒木和彦，高畠敏郎

    第15回日本熱電学会学術講演会  2018.9 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台   Country：Japan  

  • 熱電硫化銅鉱物コルーサイトの低熱伝導率を実現する結晶構造

    清水裕太，末國晃一郎，吉本大地，西堀英治，笠井秀隆，Bouyrie Yohan，Chetty Raju，太田道広，橋國克明，高畠敏郎，大瀧倫卓

    第15回日本熱電学会学術講演会  2018.9 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：仙台   Country：Japan  

  • Thermoelectric Properties of Cu-deficient Thiospinel Cu2−xTi4S8 and the derivative Cu2−xTi4.5S8 International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hidetomo Usui, Raju Chetty, Michihiro Ohta, Kazuhiko Kuroki, Toshiro Takabatake

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • Effects of Se substitution on the thermoelectric properties of (SnS)1.2(TiS2)n (n = 1, 2) International conference

    Tatsuya Hirano, Koichiro Suekuni, Katsuaki Hashikuni, Hirotaka Nishiate, Chul-Ho Lee, Toshiro Takabatake, Michitaka Ohtaki

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • Rattling dynamics under a planar coordination in tetrahedrites International conference

    Chul-Ho Lee, Koichiro Suekuni, Hiromi Tanaka, Eiji Nishibori, Atsushi Nakamura, Hideraka Kasai, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Takumi Hasegawa, Mitsutaka Nakamura,Seiko Kawamura, Tatsuya Kikuchi, Koji Kaneko, Hirotaka Nishiate, Katsuaki Hashikuni,Yasufumi Kosaka, Kazuhiko Kuroki, Toshiro Takabatake

    37th Annual International Conference on Thermoelectrics and 16th Annual European Conference on Thermoelectrics  2018.7 

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    Event date： 2018.7

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Caen   Country：France  

  • 擬一次元物質Sn1.2Ti0.8S3の熱電物性に対するNb置換効果

    喬思瑩，末國晃一郎，平野達也，橋國克明，高畠敏郎，西当弘隆，李哲虎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • Ti–S系物質の構造次元性と熱電物性

    末國晃一郎，臼井秀知，関水準記，橋國克明，喬思瑩，平野達也，黒木和彦，高畠敏郎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • N型チオスピネルCu2CoTi3S8のCuのヨウ素酸化抽出によるキャリア密度制御

    橋國克明，末國晃一郎，渡邊厚介，Bouyrie Yohan，太田道広，大瀧倫卓，高畠敏郎

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • ミスフィット層状化合物(SnS)1.2(TiS2)n (n = 1, 2)の熱電物性に対するSe置換効果

    平野達也，末國晃一郎，橋國克明，高畠敏郎，西当弘隆，李哲虎，大瀧倫卓

    第14回日本熱電学会学術講演会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪   Country：Japan  

  • Thermoelectric Properties of Ge/Sn Bearing Tetrahedrites International conference

    Koichiro Suekuni, Yasufumi Kosaka, Katsuaki Hashikuni, Yohan Bouyrie, Michihiro Ohta, Toshiro Takabatake

    36th International Conference on Thermoelectrics  2017.8 

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    Event date： 2017.7 - 2017.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Pasadena   Country：United States  

  • Carrier Density Tuning in Cu2CoTi3S8 by Oxidative Extraction of Cu International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Kosuke Watanabe, Yohan Bouyrie, Michihiro Ohta, Michitaka Ohtaki, Toshiro Takabatake

    36th International Conference on Thermoelectrics  2017.7 

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    Event date： 2017.7 - 2017.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Pasadena   Country：United States  

  • N型チオスピネルCu2MTi3S8 (M = Mn, Fe, Co, Ni)の熱電物性と電子構造

    橋國克明，末國晃一郎，高畠敏郎，西当弘隆，太田道広，臼井秀知，黒木和彦

    第13回日本熱電学会学術講演会  2016.9 

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    Event date： 2016.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京   Country：Japan  

  • Cu2MTi3S8 (M = Mn, Fe, Co, Ni) thiospinels: environmentally benign n-type thermoelectric materials International conference

    Katsuaki Hashikuni, Koichiro Suekuni, Hirotaka Nishiate, Michihiro Ohta, Toshiro Takabatake

    The 35th International Conference & The 1st Asian Conference on Thermoelectrics  2016.6 

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    Event date： 2016.5 - 2016.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Wuhan   Country：China  

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MISC

  • 日本物理学会第74回年次大会 学会報告

    橋國克明

    日本熱電学会誌   16 ( 1 )   35 - 36   2019.8

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Meeting report  

  • ICT2017参加報告と発表内容の紹介

    橋國克明

    日本熱電学会誌   14 ( 2 )   79 - 81   2017.12

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Meeting report  

  • N型チオスピネルCu2TrTi3S8 (Tr = Mn, Fe, Co, Ni)の熱電物性と電子構造

    橋國克明

    日本熱電学会誌   13 ( 2 )   71 - 72   2016.12

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

Professional Memberships

  • 日本エネルギー学会

    2026.4 - Present

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  • Japan Society of Thermophysical Properties

    2025.9 - Present

  • The Japan Society of Mechanical Engineers

    2025.1 - Present

  • The Heat Transfer Society of Japan

    2024.8 - Present

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  • The Japan Society of Applied Physics

    2020.1 - Present

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  • The Physical Society of Japan

    2019.2 - 2025.12

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  • Thermoelectrics Society of Japan

    2016.5 - Present

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Committee Memberships

  • 一般社団法人日本熱電学会   講演会委員   Domestic

    2024.12 - Present   

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    Committee type：Academic society

Research Projects

  • 天然水素開発に向けた蛇紋岩化反応による水素生成メカニズムの解明

    Grant number：26K17945  2026.4 - 2029.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    橋國 克明

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    Grant type：Scientific research funding

    CiNii Research

  • 人工かんらん石を用いた水の熱化学分解による水素生成技術の開発

    2025.8 - 2026.7

    エスペック株式会社  第28回公益信託エスペック地球環境研究・技術基金 

    橋國克明

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    Authorship：Principal investigator  Grant type：Competitive funding other than Grants-in-Aid for Scientific Research

  • Development of hydrogen production method by serpentinization reaction of artificial olivine using thermal energy

    2024.6 - 2026.3

    工学研究新分野開拓助成 

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    Authorship：Principal investigator  Grant type：On-campus funds, funds, etc.

  • スクッテルダイト型硫化物の局所構造と熱電特製の関係の解明

    Grant number：23K13548  2023.4 - 2026.3

    日本学術振興会  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    橋國 克明

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    Authorship：Principal investigator  Grant type：Scientific research funding

    熱エネルギーを電気エネルギーに直接変換できる熱電変換技術は，エネルギー利用効率を高める手段の一つである。本研究では，環境低負荷で低毒性な元素である硫黄を主成分とし，特徴的な結晶構造を持つCo2Ge3S3が高い熱電性能を示すことに着目し，その起源と考えられる局所構造の形状と熱電特性の関係を明らかにする。また，元素置換や元素充填がその局所構造をどのように変化させるのか調べる。得られた知見に加えて，キャリア濃度の最適化と格子熱伝導率の抑制を行い，熱電性能を最大化させる。

    CiNii Research

  • 硫化スピネル化合物をベースにした高性能な熱電変換物質の創製

    Grant number：19J12916  2019.4 - 2021.3

    日本学術振興会  科学研究費助成事業 特別研究員奨励費 

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    Authorship：Principal investigator  Grant type：Scientific research funding

Class subject

  • 機械工学実験第二

    2026.4 - Present   Second semester

  • 熱力学II

    2025.11   Fall quarter

  • 熱力学基礎

    2025.10   Fall quarter

  • Intoroduction to Engineering Analysis and Measurement 1

    2025.10   Second semester

  • Advanced Heat and Mass Transfer B

    2025.6   Summer quarter

  • 基幹教育セミナー

    2025.4 - Present   Summer quarter

  • Intoroduction to Engineering Analysis and Measurement 1

    2024.12   Second semester

  • 熱力学II

    2024.10   Fall quarter

  • Advanced Heat and Mass Transfer B

    2024.6   Summer quarter

  • 機械工学実験第一

    2024.4 - 2026.3   First semester

▼display all

FD Participation

  • 2025.12   Role：Participation   Title：学生指導に活かす創造的対話

    Organizer：Undergraduate school department

  • 2025.5   Role：Participation   Title：研究費の獲得について

    Organizer：[Undergraduate school/graduate school/graduate faculty]