九州大学-研究者情報 [安田和弘 (教授) 工学研究院エネルギー量子工学部門]

安田和弘（やすだかずひろ）

データ更新日：2023.06.29

教授　／　工学研究院エネルギー量子工学部門エネルギー物質科学大講座

原著論文

1.	J.M.Costantini, G. Guillaumet, G. Lelong, P. Seo K. Yasuda, Near-infrared study of radiation damage in cerium dioxide, Journal of Nuclear Materials, 583, 154493, 2023.05.
2.	吉岡聰、安田和弘, 高速重イオン照射誘起によるスピネル構造酸化物中欠陥のシンクロトロンX線解析, まてりあ, 62, 3, 169-174, 2023.01.
3.	X.F. Tan, M. Kim, K. Yasuda, K. Nogita, Strategies to enhance hydrogen storage performances in bulk Mg-based hydrides, Journal of Materials Science and Technology, 153, 139, 2023.02.
4.	S. Pooreun, K. Yasuda, S. Matsumura,N. Ishikawa, G. Gaëlle, J.M.Costantini, Microstructure evolution in 200-MeV Xe ion irradiated CeO2 doped with Gd2O3, Journal of Applied Physics, 132, 235902, 2022.12.
5.	M. Hatakeyama, T. Yamamoto, K. Yasuda, S. Matsumura, K. Yasunaga, K. Sato, In-situ observation of damage structure in Cu-Cr-Zr and Cu-Cr alloy during 1.25 MeV electron irradiation, Nuclear Materials and Energy, 10.1016/j.nme.2022.101144, 30, 101144, 2022.04.
6.	J.M.Costantini, G. Gaëlle, Lelong, Gérald,Guillaumet, Maxime, Rahman, Md. Majidur, Raman spectroscopy study of damage in swift heavy ion-irradiated ceramics, Journal of Raman Spectroscopy, 53, 1614, 2022.10.
7.	J.M. Costantini, G. Gaelle, L. Gerald, G. Maxime, P. Seo, K. Yasuda, Radiation damage in ion-irradiated CeO2 and (Ce, Gd)O2 sinters: Effect of the Gd content, J. of Nucl. Mater., 10.1016/j.jnucmat.2022.153667, 564, 153667, 2022.05.
8.	S R Aid, W R Wan Razali, H Ikenoue, K Yasuda, S Matsumura, Effect of protective layer deposition in cross-sectional analysis of focused ion beam in germanium substrate, IOP Conf. Series: Materials Science and Engineering, doi:10.1088/1757-899X/1051/1/012097, 1051, 012097, 2021.07.
9.	K. Maehata, R. Nakamura, K.Yasuda, Y. Fukunaga, M. Kudo, H. Tanaka, Energy dispersive spectroscopic measurements of X-rays emitted from the specimen containg boron, Bulletin of Teikyo University Faculty of Fukuoka Medical Technology, 16, 17, 2021.05.
10.	M.M.Rahman, T.Yamamoto, S.Matsumura, J.M.Costantini, K.Yasuda, Ab Initio molecular dynamics study of threshold displacement energy in Zirconium Nitride, Journal of Nuclear Materials , 554, https://doi.org/10.1016/j.jnucmat.2021.153076, 153076, 2021.05, Zirconium nitride (ZrN) is a promising matrix candidate for advanced nuclear fuels and transmutation of minor actinides. This study investigates the displacement process induced by low-energy recoils in ZrN using ab initio molecular dynamics (AIMD) simulations to evaluate the threshold displacement energy (Ed). Observations of the collision processes of primary knock-on atoms (PKAs) for both Zr and N atoms were performed for seven different directions: [100], [110], [111], [210], [211], [221], and [321], which cover most regions of the stereographic triangle. The values of Ed ranged from 15 eV to 50 eV, and the collision processes were dependent on the crystallographic orientations. The weighted average values of Ed evaluated from the PKA directions investigated in this study were 33 eV and 29 eV for the Zr and N atoms, respectively. Anti-site defects were not formed for either Zr or N PKAs. Sequential replacement collisions along the [110] atomic row played an important role in the collision process, providing a lower value of Ed in the crystallographic directions. Furthermore, configurations of interstitials were different between the Zr and N atoms, which also influenced Ed values..
11.	S. Yoshioka, K. Yasuda, S. Matsumura, E. Kobayashi, Transition of Cationic Local Structures in Mg1- xNixAl2O4, The Journal of Physical Chemistry, 125, https://doi.org/10.1021/acs.jpcc.0c08349, 5269-5277, 2021.03, In this study, cationic local structures in the series of MgAl2O4–NiAl2O4 solid solutions (Mg1-xNixAl2O4) were examined using Mg, Al, and Ni K-edge X-ray absorption near-edge structure (XANES). Theoretical calculations of XANES using the all-electron full-potential augmented plane-wave in addition to the local-orbital method were performed to investigate the transition of the cationic local structures depending on their compositions. For the calculations, the atomic coordination was studied using crystal structures of normal and ordered inverse spinels. The experimental spectra of the end members MgAl2O4 and NiAl2O4 were successfully reproduced from the theoretical spectra. Furthermore, the inversion degrees of the end members, analyzed using the calculated spectra, were consistent with previous experimental reports. The Ni2+ ions show three kinds of local structures, and their volume fractions change depending on the composition of Mg1-xNixAl2O4, whereas the Mg2+ ions show two kinds of local structures. The Al3+ ions change the local structure between tetrahedral and octahedral sites to balance the behaviors of Mg2+ and Ni2+ in the compositions. Although the analysis using XANES provides rich information, a theoretical approach is desirable for reliable and quantitative analysis of multication oxides and their disordering..
12.	S. Yoshioka, K. Tsuruta, T. Yamamoto, K. Yasuda, S. Matsumura, T. Sugiyama, Y. Oba, N. Ishikawa, E. Kobayashi, K. Okudaira, Local Structure Investigations of Accumulated Damage in Irradiated MgAl2O4, Journal of American Ceramic Society, https://doi.org/10.1111/jace.17101, 103, 4654-4663, 2020.03, Damaged structures in the MgAl2O4 spinel induced by swift heavy ions were investigated using the X-ray absorption near edge structure (XANES) and small angle X-ray scattering (SAXS). Increasing the fluence of 100 MeV Xe ions leads to increased SAXS intensity and XANES spectral changes on both Mg and Al K-edges. The damaged regions of ion tracks were observed by SAXS to be cylindrical in shapewith a diameter of 5 nm. The theoretical XANES spectra indicated that the changes in the experimental spectra were due to the cationic disordering between tetrahedral and octahedral sites. This disordering caused an increase in the inversion degree of the cations. Furthermore, the quantitative analysis of the XANES spectra revealed the preferential occupation of cations at the octahedral sites at high fluence..
13.	T. Sueyoshi,, T. Kotaki, Y. Furuki, T. Fujiyoshi, S. Semboshi, T. Ozaki, H. Sakane, M. Kudo, K. Yasuda and N. Ishikawa , Strong flux pinning by columnar defects with directionally dependent morphologies in GdBCO-coated conductors irradiated with 80 MeV Xe ions, Japanese Journal of Applied Physics, https://iopscience.iop.org/article/10.35848/1347-4065/ab6f2b, 59, 2, 023001, 2020.02, We show that Xe ion irradiation with 80 MeV to GdBa2Cu3O y -coated conductors creates different morphologies of columnar defects (CDs) depending on the irradiation angles θ i relative to the c-axis: continuous CDs with a larger diameter are formed for oblique irradiation at θ i = 45°, whereas the same ion beam at a different angle (θ i = 0°) induces the formation of discontinuous CDs. The direction-dependent morphologies of CDs significantly affect the angular behavior of the critical current density J c. In particular, low-energy irradiation defects induce further improvement of J c in a unique combination of irradiation angles of θ i = 0° and ±45°: discontinuous CDs at θ i = 0° and crossed CDs at θ i = ±45° provide correlated pinning in a wide angular range, which is more strongly enhanced by each other via the pinning of kinks..
14.	J.M. Costantini, P. Seo, K. Yasuda, AKM S.I. Bhuian, T. Ogawa, D. Gourier, Cathodoluminescence of cerium dioxide: Combined effects of the electron beam energy and sample temperature, Journal of luminessence, https://doi.org/10.1016/j.jlumin.2020.117379, 226, 117379, 2020.05, In-situ cathodoluminescence (CL) spectroscopy is used to study point-defect formation in cerium dioxide (CeO2) by high-energy electrons (400 keV-1,250 keV) at ∼100 K, 200 K, and 300 K in a high-voltage electron microscope (HVEM). Complementary CL spectra are also obtained for 20-keV electron excitation at ∼300 K in a scanning electron microscope (SEM). Experiments were carried out on a single crystal and polycrystalline sintered sample. The more prominent and broad emission band centered at a photon energy of ∼4.2 eV is ascribed to F+ centers (oxygen vacancies) produced by the high-energy electron irradiation. Two other weaker CL bands centered at ∼2.3–2.4 eV and 2.8–2.9 eV at 300 K are related to trivalent cerium ions, corresponding to 5d → 4f radiative transitions, regardless of electron energy. Similar spectra are recorded at 100 K and 200 K, yet with shifts and broadening of the latter emission bands. A maximum of all CL bands is found at ∼600 keV electron energy for the polycrystalline sample regardless of temperature, and for the single crystal at 300 K. In contrast, a continuous increase versus electron energy is observed for the 4.2-eV band of the single crystal at 100 K and 200 K above a threshold corresponding to the oxygen displacement energy. The dependence of CL intensities on the primary electron energy is analyzed on the basis of the interplay of the luminescence cross section and oxygen displacement cross section. The electron energy dependence of ionization cross sections is addressed by relying on secondary electron spectra computed with the PHITS code which is benchmarked against other computer codes such as PENELOPE, as implemented in Geant4. The F+ center band intensity is strongly reduced in the polycrystalline sample with respect to the single crystal in the same irradiation conditions regardless of temperature due to grain boundaries.
15.	松村晶, 村上恭和, 波多聰, 安田和弘, 工藤昌輝, 福永裕美, 阿内三成, 鳥山誉亮, 前野宏志, ナノマテリアル開発のための超顕微鏡解析共用拠点(九州大学), まてりあ, https://doi.org/10.2320/materia.58.746, 58, 12, 746-753, 2019.12.
16.	J.M. Costantini, G. Lelong, M. Guillaumetm, D. Gourier, S. Takaki, N. Ishikawa, H. Watanabe, K. Yasuda, Optical Reflectivity of Ion-irradiated Cerium Dioxide Sinters, Journal of Applied Physics, https://doi.org/10.1063/1.5100582, 126, 175902, 2019.11, [URL], Reflection spectra of cerium dioxide sintered samples were measured in the UV-visible range after irradiation with various heavy ions (2.4-MeV Cu, 5-MeV W, 10-MeV W, 36-MeV W, 100-MeV Kr, and 200-MeV Xe). Differential reflectance spectra of irradiated samples after subtraction of the reference sample spectrum are fit with six broad Gaussian bands centered at about 1.2, 2.2, 2.8, 4.0, 4.8, and 6.2 eV. The growth curves of most bands show a saturation behavior vs ion fluence. Reflection spectra are consistent with the UV-visible absorption spectra of electron-irradiated ceria single crystals for photon energies lower than 3.2 eV, corresponding to the optical gap. The spectra are tentatively analyzed on the basis of charge transfer bands and the 4f-5d transitions related to the Ce3+ ions in the distorted environment formed by irradiation. More insight into defect formation is given by the reflection spectra rather than the absorption ones due to the limitation in the absorption of the optical gap. These data are also discussed with reference to the radiation damage processes by electronic excitations and nuclear collisions in ceria..
17.	安田和弘、渡辺恭志、Pooreun Seo、AKM Islam Saiful Bhuian、松村晶、Jean-Marc Costantin, 超高圧電子顕微鏡-カソードルミネッセンス分光法の照射損傷研究への応用, 顕微鏡, 54, 3, 110-115, 2019.12.
18.	Mo Rigen He, Shuai Wang, Ke Jin, Hongbin Bei, Kazuhiro Yasuda, Syo Matsumura, Kenji Higashida, Ian M. Robertson, A comparative characterization of defect structure in NiCo and NiFe equimolar solid solution alloys under in situ electron irradiation, Scripta Materialia, 10.1016/j.scriptamat.2019.03.008, 166, 96-101, 2019.06, [URL], Dislocation loops in NiCo and NiFe, both being single-phase, equimolar solid solution alloys, are generated by in situ high-voltage electron irradiation and characterized inside a transmission electron microscope. In addition to the different defect growth rates, the two alloys present dislocation loops with distinct shape evolution and element segregation, which reflect the element-sensitive, intrinsic properties (e.g., defect energetics, lattice distortion, and local ordering) of the alloys. These results provide evidence that the structure and dynamics of radiation-induced defects in concentrated alloys depend on not only the number but also the species of alloying elements..
19.	Jean Marc Costantini, Tatsuhiko Ogawa, AKM Saiful I. Bhuian, Kazuhiro Yasuda, Cathodoluminescence induced in oxides by high-energy electrons Effects of beam flux, electron energy, and temperature, Journal of Luminescence, 10.1016/j.jlumin.2018.12.045, 208, 108-118, 2018.04, [URL], The cathodoluminescence (CL) induced in four oxide single crystals (α-Al2O3, ZrO2: Y or YSZ, MgAl2O4, and TiO2) by high-energy electrons from 400 keV to 1250 keV was studied as a function of beam parameters (flux and energy). The main CL bands are related to F center (oxygen vacancy) formation by elastic collisions above the threshold displacement energy of oxygen atoms. The beam-intensity dependence is interpreted on the basis of a kinetic-rate model involving F-center formation and annihilation. The temperature effect was also followed from 110 K to 300 K. A broad maximum is found for all bands at about 200 K for sapphire, whereas a monotonous increase with temperature is observed for YSZ. The plots of CL intensity versus temperature are mainly interpreted by the interplay between the thermal dependence of thermalized free-carrier trapping rates and luminescence efficiency. Finally, the dependence of CL intensity on the primary electron energy for F centers in YSZ showing a maximum at about 600 keV is explained on the basis of the interplay between point-defect formation and secondary-electron energy spectra production..
20.	藤本望、安田和弘、前畑京介, 九州大学での原子力に関する新たな教育プログラム , 保全学, 17, ５pages, 2019.01.
21.	Jean Marc Costantini, Gaëlle Gutierrez, Hideo Watanabe, Kazuhiro Yasuda, Seiya Takaki, Gérald Lelong, Maxime Guillaumet, William J. Weber, Optical spectroscopy study of modifications induced in cerium dioxide by electron and ion irradiations, Philosophical Magazine, 10.1080/14786435.2019.1599145, 2019.01, [URL], UV-visible absorption spectroscopy and Raman spectroscopy were used to study damage production in cerium dioxide epitaxial films and polycrystalline sintered samples after irradiation with electrons for three energies to span the threshold displacement energies of cerium and oxygen atoms, and 2.4-MeV Cu ions. Neither amorphization nor specific colour-centre bands were detected. Evolutions of the refractive index were derived from the interference fringes in the optical transmission spectra of epilayers after irradiation. No significant change of the refractive index occurred for the 1.0-MeV electron irradiation, whereas a maximum decrease by 28 ± 8% was deduced for the 1.4-MeV and 2.5-MeV energies. These modifications are consistent with ballistic damage on the cerium sublattice for high electron energies producing Ce ³⁺ ions. However, no significant change of refractive index was found for the Cu ion irradiation. This likely stems from the high rate of Frenkel pair recombination in the collision cascades induced by more energetic recoils than for the electron irradiations, combined with electronic excitations and hole capture on Ce ³⁺ ions. This study reveals modifications of the electronic structure upon irradiation that could take place in other non-amorphizable oxide systems..
22.	Jean Marc Costantini, Gérald Lelong, Maxime Guillaumet, Seiya Takaki, Kazuhiro Yasuda, Color-center formation and thermal recovery in X-ray and electron-irradiated magnesium aluminate spinel, Journal of Applied Physics, 10.1063/1.5055230, 124, 24, 2018.12, [URL], We have studied the formation of color centers in magnesium aluminate spinel (MgAl2O4) by X-ray and electron irradiations near room temperature (RT). For this purpose, Cu Kα radiation and three electron energies (1.0, 1.4, and 2.5MeV) were used for variable fluences (up to 4.2 × 1018 cm−2). Offline UV-visible absorption spectra were recorded at RT as well as at low temperature down to 27K after electron irradiation. The dependence of the production rate of F centers (oxygen vacancies) on the electron energy yields a threshold displacement energy of 190 ± 10 eV for oxygen atoms at RT, which is much higher than the determinations by molecular-dynamics simulations. Such a discrepancyis discussed on the basis of available migration data of point defects in spinel. Equipartition of F0 and F+ centers, i.e., the neutral (VO x ) and singly ionized (VO . ) oxygen vacancies, is reached for high electron fluences. Moreover, the evolution of the width of color-center absorption bands versus temperature is interpreted with the classical theory for F centers (neutral halogen vacancies) in alkali halides. The Stokes shifts are deduced from the temperature dependence of the absorption bandwidths of color centers like for alkali halides and alkaline-earth oxides. Finally, isothermal annealing data for long annealing time show a non-zero asymptotic behavior for both F0 and F+ centers. This uncommon behavior is interpreted by charge exchange processes leading to an equilibrium state between those two color centers..
23.	安田和弘, 酸化物中のイオントラック構造と微細組織発達, 京都大学工学研究科附属量子理工学教育研究センター（ＱＳＥＣ）第19回公開シンポジウム　プロシーディングス, 2018.10.
24.	S. Yoshioka, K. Tsuruta, T. Yamamoto, K. Yasuda, S. Matsumura, N. Ishikawa, E. Kobayashi, “X-ray absorption near edge structure and first-principles spectrum investigations of cation disordering in MgAl2O4 induced by swift heavy ions “, Physical Chemistry and Chemical Physics, 10.1039/c7cp07591j, 20, 4962-4969, 2018.01, Cationic disorder in MgAl2O4 spinel induced by swift heavy ions was investigated using X-ray absorption near edge structure.With changes of the irradiation fluences of 200 MeV Xe ions, the Mg K-edge and Al K-edge spectra were synchronouslychanged. The calculated spectra based on density function theory indicate that the change in experimental spectra weredue to cation disordering between Mg in tetrahedral sites and Al in octahedral sites. These results suggest a high inversiondegree to the extent that completely random configuration is achieved in MgAl2O4 induced by the high density electronicexcitation under swift heavy ion irradiation..
25.	S. Matsumura, K. Yasuda, AKM S. . Bhuian, S. Takaki,, “High Voltage Electron Microscope Study of Lattice Defect Formation in Fluorite-type Oxide Crystals”, Proceedings on International Conference on Materials and Systems for Sustainability (ICMaSS 2017), 2017.09.
26.	安田和弘，永石大誠，松村晶，高木聖也，石川法人, 酸化物中のイオントラック構造と微細組織発達, 第63回放射線科学研究会講演概要集, 2017.07.
27.	J-M. Costantini, S. Miro, G. Gutierrez, K. Yasuda, S. Takaki, N. Ishikawa, M. Toulemonde, "Raman spectroscopy study of damage induced in cerium dioxide by swift heavy ion Irradiations" , Journal of Applied Physics, https://doi.org/10.1063/1.5011165, 122, 205901(9 pages), 2017.10, The damage induced in cerium dioxide by swift heavy ion irradiation was studied by micro-Raman spectroscopy. For this purpose, polycrystalline sintered pellets were irradiated by 100-MeV Kr, 200-MeV Xe, 10-MeV, and 36-MeV W ions in a wide range of fluence and stopping power (up to 28MeV lm1). No amorphization of ceria was found whatsoever, as shown by the presence of the peak of Raman-active T2g mode (centered at 467 cm1) of the cubic fluorite structure for all irradiation conditions. However, a clear decrease of the T2g mode peak intensity was observed as a function of ion fluence to an asymptotic relative value of about 45%. Similar decays were also observed for satellite peaks and second-order peaks. Track radii deduced from the decay kinetics for the 36-MeV W ion data are in good agreement with previous determinations by X-ray diffraction and reproduced by the inelastic thermal spike model for low ion velocities. However, interaction between the nuclear and electronic stopping powers is needed to describe the decay kinetics of 10-MeV W ion data by the thermal spike process. Moreover, the asymmetrical broadening of the main T2g peak after irradiation was analyzed with different theoretical models. Published by AIP Publishing. https://doi.org/10.1063/1.5011165.
28.	J.-M. Costantini, Y. Watanabe, K. Yasuda, M. Fasoli, “Cathodo-luminescence of Color Centers Induced in Sapphire and Yttria-stabilized Zirconia by High Energy Electrons”, Journal of Applied Physics, http://dx.doi.org/10.1063/1.4980111, 121, 153101(10 pages), 2017.05.
29.	K. Nogita, X.Q.Tran, T. Yamamoto, E. Tanaka, S.C. McDonald, C.M. Gourlay, K. Yasuda, S. Matsumura, "Reply to ‘Comments on "Evidence of the hydrogen release mechanism in bulk MgH2", Scientific Report, DOI: 10.1038/srep43720, 7, 43720 (3pages), 2017.04.
30.	A. Rinkenburger, T. Toriyama, K. Yasuda, R. Niessner, The catalytic effect of potassium compounds in soot oxidation, ChemCatChem, ChemCatChem 10.1002/cctc.201700338, 2017.03.
31.	Y. Matsukawa, S. Kitayama, K. Murakami, Y. Shinohara, K. Yoshida, H. Maeno, H.L. Yang, K. Toyama, K. Yasuda, H. Watanabe, A. Kimura, H. Muta, S. Yamanaka, Y.F.Li, Y. Sato, S. Kano, H. Abe, “Reassessment of oxidation-induced amorphization and dissolution of Nb precipitates in Zr_Nb nuclear fuel cladding tubes”, Acta Materialia, http://dx.doi.org/10.1016/j.actamat, 127, 153-164, 2017.01, Y. Matsukawa, S. Kitayama, K. Murakami, Y. Shinohara, K. Yoshida, H. Maeno, H.L. Yang, T. Toyama, K. Yasuda, H. Watanabe, A. Kimura, H. Muta, S. Yamanaka, Y.F. Li, Y. Satoh, S. Kano, H. Abe,.
32.	T. Sueyoshi, Y. Iwanaga, Y. Fujiyoshi, Y. Takai, M. Mukaida, M. Kudo, K. Yasuda, N. Ishikawa, Angular Behavior of Jcin GdBCO Coated Conductors with Crossed Columnar Defects around ab-plane, IEEE Transactions of Applied Superconductivity, 2MPo2E, 01-05, 2017.01.
33.	T. Sueyoshi, Y. Iwanaga, Y. Fujiyoshi, Y. Takai, M. Mukaida, M. Kudo, K. Yasuda, N. Ishikawa, Angular Behavior of Jcin GdBCO Coated Conductors with Crossed Columnar Defects around ab-plane”, IEEE Transactions of Applied Superconductivity, 2MPo2E, 01-05, 2017.01.
34.	Mo-Rigen He, S. Wang, S.Shi, K. Jin, H. Bei, K. Yasuda, S. Matsumura, K. Higashida, I.M. Robertson, Mechanisms of Radiation-Induced Segregation in CrFeCoNi-based Single-Phase Concentrated Solid Solution Alloys, http://dx.doi.org/10.1016/j.actamat.2016.12.046, 126, 182-193, 2016.12, .
35.	Mo-Rigen He, S. Wang, K. Jin, H. Bei, K. Yasuda, S. Matsumura, Kenji Higashida, I.M. Robertson, Enhanced Damage Resistance and Novel Defect Structure of CrFeCoNi under In Situ Electron Irradiation, http://dx.doi.org/10.1016/, 125, 5-9, 2016.07.
36.	K. Sato, S.Tashiro, Y. Yamaguchi, T.J. Konno, T. Yamamoto, K. Yasuda, S. Matsumura, Three-Dimensional Imaging of a Long-Period Stacking Ordered Phase in Mg97Zn1Gd2 Using High-Voltage Electron Microscopy, MATERIALS TRANSACTIONS , 57, 918, 2016.07.
37.	AKM S.I. Bhuian, T. Yamamoto, K. Kuwahara, K. Yasuda, S. Matsumura, H. Yasuda, Temperature dependent evolution of dislocation loops in YSZ under high energy electron irradiation, Transaction of Materiaks Research Society of Japan 41 (2016) 319, 41 , 319-323, 2016.07.
38.	S. Takaki, K. Yasuda, S. Yoshioka, S. Matsumura, N. Ishikawa, Structure of Ion Tracks in Ceria Irradiated with High Energy Xenon Ions, http://dx.doi.org/10.1016/j.pnucene.2016.07.013, 92, 306-312, 2016.06, .
39.	J.-M. Costantini, L. Gerald, G. Maxime, W.J. Weber, S. Takaki, K. Yasuda, Color-center production and recovery in electron-irradiated magnesium aluminate spinel and ceria, Journal of Physics Condensed Matter, doi:10.1088/0953-8984/28/32/325901, 28, 325901(9pages), 2016.06.
40.	K. Yasuda, Structure of defects and microstructure evolution in oxide ceramics -role of electronic excitation and selective displacement damage-, 2nd Int. Workshop Irradiation of Nuclear Materials: Flux and Dose Effects, 2016.01.
41.	S. Yoshioka, T. Yamamoto, K. Yasuda, S. Matsumura, “X-ray absorption fine structure investigation of long period stacking ordered structure formation in Mg-Zn-Gd alloys”, PTM 2015-Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015,, 743-744, 2015.09.
42.	A. Takano, K. Maehata, Naoko IYOMOTO, K. Yasuda, H. Maeno, K. Shiiyama, K. Tanaka, Characterization of Polycapillary Optics in a TES microcalorimeter EDS system installed on an SEM, J. of Low Temperature Physics, DOI 10.1007/s10909-015-1350-6 , 2015.06.
43.	T. Sueyoshi, T. Kotaki, Y. Furuki, Y. Uraguchi, T.Kai, T.Fujiyoshi, Y. SHimada, kazuhiro Yasuda, N. Ishikawa, Influence of discontinuous columnar defects on flux pinning in GdBCO coated conductors, IEEE Transactions of Applied Superconductivity, 2015.04.
44.	A. Takano, K. Maehata, N. IYOMOTO, K. Yasuda, H. Maeno, K. Shiiyama, K. Tanaka, “Characterization of TEM Microcalorimeter EDS System on a SEM”, Proceedings of the 29th Workshop on Radiation Detectors and Their Uses, Feburary 3-5, 2015. Tsukuba, Japan, pp. 28-37. , 2015.02.
45.	Kazuhiro Nogita, X.Q.Tran, T. Yamamoto, E. Tanaka, S.C. McDonald, C.M. Gourlay, kazuhiro Yasuda, Syo Matsumura, Evidence of the hydrogen release mechanism in bulk MgH2, Scientific Report, 2015.02.
46.	S. Takaki, kazuhiro Yasuda, T.Yamamoto, Syo Matsumura, N. Ishikawa, Atomic-Resolution HAADF/ABF-STEM Observation of Radiation-Induced Defects in Ceria, Proceedings on 18th Internbational Microscopy Congress, Prague, 2014.09.
47.	N. Sumimoto, k. Nakao, T. Yamamoto, kazuhiro Yasuda, Syo Matsumura, In-situ observation of morphological changes of gold nanorods under near infrared pulsed laser irradiation, Proceedings on 18th Internbational Microscopy Congress, 2014.09.
48.	N. Sumimoto, k. Nakao, T. Yamamoto, kazuhiro Yasuda, Syo Matsumura, Yasuro Niidome, In-situ observation of structural transformation of gold nanorods under pulsed laser irradiation in an HVEM, Microscopy , 2014.05.
49.	K. Yasuda, T.Yamamoto, S. Takaki, S. Matsumura, N. Ishikawa, Atomic Structure of Ion Tracks and Microstructure Evolution in Oxides Irradiated with Swift Heavy Ions, Proceedings on Eleventh International Topical Meetings on Nuclear Applications of Accelerators (AccApp'13), 5 pages, 2013.08.
50.	S. Takaki, kazuhiro Yasuda, T. Yamamoto, Syo Matsumura, N. Ishikawa, Atomic Structure of Ion Tracks In Ceria, Nucl. Instr. and Meth. Phys. Res.B, 326, 140-144, 2014.05.
51.	S. Takaki, T. Yamamoto, M. Kutsuwada, kazuhiro Yasuda, Syo Matsumura, N. Ishikawa, M.Matsuda, M. Sataka, Atomic Structure of Ion Tracks in CeO2 Irradiated with 200 MeV Xe Ions, JAEA-review, JAEA-Tandem Annual Report , 2014.07.
52.	kazuhiro Yasuda, Motoki Etoh, Kenichi Sawada, Tomokazu Yamamoto, Syo Matsumura, Kazufumi Yasunaga, Norito Ishikawa, Defect formation and accumulation in CeO2 irradiated with swift heavy ions, Nucl. Instr. and Meth. B, 314,(2013) pp. 185-190., 2013.06.
53.	K. Furumoto, Tetsuo Tanabe, Naoji Yamamoto, Takeshi Daio, Syo Matsumura, kazuhiro Yasuda, Development of Novel Optical Fiber System for Cathodoluminescence Detection in High Voltage Transmission Electron Microscope, Materials Transactions, 54, 5, 854-856, 2013.05.
54.	Seiya Takaki, Tomokazu Yamamoto, Masanori Kutsuwada, kazuhiro Yasuda, Syo Matsumura, Atomistic observation of electron irradiation-induced defects in CeO2 , Materials Research Symposium Proceedings , 1514, 2013.03.
55.	安田和弘、安永和史、椎山謙一、松村晶, 蛍石型酸化物に形成される転位ループ性状と選択的はじき出し損傷の効果, 顕微鏡, 46, 3, 2011.10.
56.	K. Yasuda, T. Yamamoto, M. Etoh, S. Kawasoe, S. Matsumura, N. Ishikawa, Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation, International Journal of Materials Research , 102, 9, 1082-1088, 2011.09.
57.	K. Shiiyama, T. Yamamoto, T. Takahashi, A. Guglielmetti, A. Chartier, K. Yasuda, S. Matsumura, K. Yasunaga, C. Meis, Molecular dynamics simulations of oxygen Frenkel pairs in cerium dioxide, Nucl. Instr. and Meth. Phys. Res., B, 268, pp.107-108, 2010.08.
58.	K. Yasuda, K. Yasunaga, K. Shiiyama, S. Matsumura, Radiation-induced defect kinetics and selective displacement damage in fluorite structure oxides, Proc. of Tenth Japan-China Symposium 'Materials for Advanced Energy Systems and Fission &Fusion Engineering, 2010.11.
59.	Y. Takahashi, M. Tanaka, K. Higashida, K. Yasuda, S. Matsumura, H. Noguchi, Acombined environmental straining specimen holder for high-voltage electron microscopy, Ultramicroscopy, 110, 1420-1427, 2010.09.
60.	M. Shirai, K. Tsumori, K. Yasuda, S. Matsumura, N. Ishikawa, Morphological and compositional change in FePt nanogranular thin films irradiated with swift heavy ion irradiation, JAEA-Tokai Tandem Annual Report, pp.107-108., 2009.06.
61.	M. Shirai , K. Tsumori, M. Kutsuwada, K. Yasuda, S. Matsumura, Morphological change in FePt nanogranular thin films induced by swift heavy ion irradiation, Nucl. Instr. and Meth. Phys. Res., B , 267, pp.1781-1791., 2009.05.
62.	M. Kinoshita, K. Yasunaga, T. Sonoda, A. Iwase, N. Ishikawa, M. Sataka, K. Yasuda, S. Matsumura, H. Y. Geng, T. Ichinomiya, Y. Chen, Y. Kaneta, M. Iwasawa, T. Ohnuma, Y. Nishiura, J. Nakamura, Hj Matzke, Recovery and Restructuring induced by Fission Energy Ion in High Burnup Nuclear Fuel, Nucl. Instr. and Meth. Phys. Res., B , 267, pp.960-963., 2009.05.
63.	安永和史、安田和弘、椎山謙一、松村晶、園田健, 酸化セリウム中の転位ループ性状の電子エネルギー依存, まてりあ　特集「顕微鏡法による材料開発のための微細構造研究最前線(8)特集」, 第47巻12号, p.612., 2008.12.
64.	渡邉壮俊、野間敬、安田和弘、安永和史、松村晶, 電子線照射により生成したCaF2結晶中欠陥集合体のその場TEM観察, まてりあ　特集「顕微鏡法による材料開発のための微細構造研究最前線(8)特集」, 第47巻12号, p.647., 2008.12.
65.	山本知一、安田和弘、松村晶, MgAl2O4 スピネル中のイオントラックの構造解析, まてりあ　特集「顕微鏡法による材料開発のための微細構造研究最前線(8)特集」, 第47巻12号, p.614., 2008.12.
66.	白井学、津守孝一、松村晶、安田和弘, 210 MeV Xeイオン照射したFePtナノグラニュラー薄膜の電子線トモグラフィー観察, まてりあ　特集「顕微鏡法による材料開発のための微細構造研究最前線(8)特集」, 第47巻12号, p.639., 2008.12.
67.	K. Yasuda, T. Yamamoto, S. Kawasoe, M. Eto, S. Matsumura, N. Ishikawa, Atomic structure of ion tracks in magnesium aluminate spinel irradiated with swift heavy ions, JAEA Review, 2008, 101-102, 2008.12.
68.	A. Chartier, T. Yamamoto, K. Yasuda, C. Meis, K. Shiiyama, and S. Matsumura, Molecular dynamics simulation of irradiation induced phase transition in MgAl2O4, Proceedings of the Fourth International Conference on Multiscale Materials Modeling (MMM2008), pp.583-588., 2008.11.
69.	K Shiiyama, T. Yamamoto, T. Takahashi, A. Guglielmetti, A. Chartier, K. Yasuda, S. Matsumura, K. Yasunaga, C. Meis, Molecular Dynamics Study of Frenkel Pairs in Cerium Dioxide, Proceedings of the Fourth International Conference on Multiscale Materials Modeling (MMM2008), pp.598-601．, 2008.11.
70.	A. Guglielmetti, A. Chartier, L. Van Brutzel, J.-P. Croconbette, K. Yasuda, C. Meis, S. Matsumura, Atomistic simulation of point defects behavior in Ceria, Nucl. Instr. and Meth. Phys. Res., B, 266, pp.5120-5125., 2008.10.
71.	A. Chartier, T. Yamamoto, K. Yasuda, C. Meis and S. Matsumura, Frenkel pair accumulation induced crystallization of amorphous MgAl2O4, J. Nucl. Mater, 378, pp.188-192, 2008.08.
72.	T. Yamamoto, A. Chartier, K. Yasuda, C. Meis, K. Shiiyama and S. Matsumura, Molecular Dynamics Simulation of Point Defect Accumulation in MgAl2O4, Nucl. Instr. and Meth. Phys. Res., B, 266、pp.2676-2682, 2008.05.
73.	K. Yasuda, T. Yamamoto, S. Seki, K. Shiiyama and S. Matsumura, Production and Stability of Radiation-Induced Defects in MgAl2O4 under Electronic Excitation, Nucl. Instr. and Meth. Phys. Res., B, 266、pp.2834-2841, 2008.05.
74.	K. Yasunaga, K. Yasuda, S. Matsumura, T. Sonoda, Electron-energy dependent formation of dislocation loops in CeO2, Nucl. Instr. and Meth. Phys. Res., B, 266、pp.2877-2881, 2008.05.
75.	K. Yasuda, K. Yasunaga, S. Matsumura, T.Sonoda, Characteristics of Radiation-Induced Defects in Fluorite Structure Oxides Formed by Electron Irradiation (PPt file), Materials Innovations for Next-Generation Nuclear Energy, edited by R. Devanathan, R.W. Grimes, K. Yasuda, B.P. Uberuaga, and C. Meis (Mater. Res. Soc. Symp. Proc. Volume 1043E, Warrendale, PA, 2007) , 1043-T12-02, 2007.12.
76.	K. Yasuda, T. Yamamoto, S. Kawasoe, S. Matsumura and N. Ishikawa, Microstructure and Ion Configuration of Spinel Irradiated with Swift Heavy Ions, JAEA Review, 2007-046 (2007) 91., 2007.10.
77.	Kazuhiro Yasuda, Tomokazu Yamamoto and Syo Matsumura, The Atomic Structure of Disordered Ion Tracks in Magnesium Aluminate Spinel, Journal of Materials, (2007) 27, 2007.04.
78.	安田和弘、山本知一、島田幹夫、松村晶, スピネル化合物中のイオントラックの構造と不規則化挙動, 顕微鏡, 41（2006）150．, 2007.02.
79.	M. Shirai, T. Horiuchi, A. Horiguchi, S. Matsumura, K.Yasuda, M. Watanabe, and T. Masumoto, Morphological change in FePt nanogranular thin films induced by irradiation with 2.4 MeV Cu2+ ions: Electron tomography observation, Mater. Trans, 47 (2006) 52, 2006.12.
80.	K. Yasunaga, K. Yasuda, S. Matsumura and T. Sonoda, Nucleation and growth of defect clusters in CeO2 irradiated with electrons, Nucl. Instr. and Meth. Phys. Res., B, 250 (2006) 114, 2006.12.
81.	K. Yasuda, T. Yamamoto, M. Shimada, S. Matsumura, Y. Chimi and N. Ishikawa, ‘, Atotic structure and disordering induced by 350 MeV Au ions in MgAl2O4, Nucl. Instr. and Meth. Phys. Res., B, 250 (2006) 238, 2006.12.
82.	T. Yamamoto, M. Shimada, K. Yasuda, S. Matsumura, Y. Chimi and N. Ishikawa, Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions, Nucl. Instr. and Meth. Phys. Res., B, 245 (2006) 235, 2006.12.
83.	Kazuhiro Yasuda and Syo Matsumura, Radiation Damage Effects in Insulators for Fusion Reactors: Microstructure Evolution in MgO-Al2O3 System Oxide Crystals, Advances in Science and Technologies , 45 (2006) 1951, 2006.10.
84.	Masatoshi Watanabe, Takashi Noma, Kazuhiro Yasuda, Kazufumi Yasunaga, Syo Matsumura and Chiken Kinoshita,, In-situ Transmission Electron Microscopy Observation of Electron-beam-induced Defect-clusters in CaF2 Crystal, Proc. of 16th Electron Mmicroscopy Congress, 1854, 2006.08.
85.	Kazuhiro Yasuda , Tomokazu Yamamoto, Mikio Shimada and Syo Matsumura , HRTEM Study of Radiation-induced Ion Tracks in MgAl2O4 Spinel, Proc. of 16th Electron Mmicroscopy Congress, 1853, 2006.08.
86.	Tomokazu Yamamoto, Mikio Shimada, Kazuhiro Yasuda, Syo Matsumura, Yasuhiro Chimi and Norito Ishikawa,, Electron Channeling X-ray Analysis of Cation Disordering in MgAl 2 O4 Spinel Irradiated with 350 MeV Au Ions, Proc. of 16th Electron Mmicroscopy Congress, 896, 2006.08.
87.	Manabu Shirai, Atsushi Horiguchi, Kazuhiro Yasuda, Syo Matsumura, Masato Watanabe and Takeshi Masumoto, , Electron Tomography Observation for Morphological Change of FePt Particles Induced by Ion Irradiation, Proc. of 16th Electron Mmicroscopy Congress, 704, 2006.08.

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