研究成果

鉱物の衝撃圧縮下における結晶構造相転移

• S. Takagi, S. Tracy, In situ XRD observation of the amorphization of feldspars under plate-impact shock compression. AIP Conference Proceedings, 3066, 520001 (2024).

• S. Takagi, K. Ichiyanagi, A. Kyono, N. Kawai, S. Nozawa, N. Ozaki, Y. Seto, T. Okuchi, S. Nitta, S. Okada, K. Miyanishi, K. Sueda, T. Togashi, T. Yabuuchi, Phase transition and melting in zircon by nanosecond shock loading, Physics and Chemistry of Minerals 49, 8 (2022).

• S. Takagi, A. Kyono, S. Nozawa, N. Kawai, K. Inukai, R. Fukaya, N. Funamori, S. Adachi, K. Ichiyanagi, In situ observation of the phase transition behavior of shocked baddeleyite, Geophysical Research Letters 47(17), e2020GL089592 (2020).

鉱物の静的高温高圧下における結晶構造相転移

• R. Kuwamura, S. Takagi, A. Kyono, Pressure-induced phase transition of oxygen defective perovskite srebrodolskite Ca2Fe2O5, Journal of Mineralogical and Petrological Sciences 118, (2023).

• V. Stagno, L. Bindi, S. Takagi, A. Kyono, Can quasicrystals survive in planetary collisions?, Progress in Earth and Planetary Science 8(1) (2021).

• S. Takagi, A. Kyono, S. Mitani, N. Sugano, Y. Nakamoto, N. Hirao, X-ray diffraction study of the icosahedral AlCuFe quasicrystal at megabar pressures, Materials Letters 161 (2015).

鉱物の合成と物性

• A. Kyono, R. Ikeda, S. Takagi, W. Nishiyasu, Structural evolution of gypsum (CaSO4·2H2O) during thermal dehydration, Journal of Mineralogical and Petrological Sciences 117, 015 (2022).

• Y. Sano, A. Kyono, Y. Yoneda, N. Isaka, S. Takagi, G. Yamamoto, Structure changes of nanocrystalline mackinawite under hydrothermal conditions, Journal of Mineralogical and Petrological Sciences 115(3), 261 (2020).

物性物理・材料科学における固体の動的圧縮挙動

• K. Ichiyanagi, S. Takagi, N. Kawai, A. Kyono, R. Fukaya, Y. Seto, S. Nozawa. Evaluation of shock-wave-induced plastic deformation of silicon single crystal using time-resolved Laue diffraction. AIP Advances (in press)

• S. E. Parsons, K. Katagiri, H. Chen, A. Hari, E. W. Cubit, S. J. Irvine, D. Luccioni, R. Lin, L. E. Madril, T. Reddy, W. J. McKinney, J. Ren, W. Yang, N. Ozaki, A. Amouretti, R. Kodama, H. Nakamura, Y. Nakanishi, M. Ota, Y. Seto, S. Takagi, T. Okuchi, Y. Umeda, Y. Inubushi, K. Miyanishi, K. Sueda, T. Togashi, M. Yabashi, T. Yabuuchi, W. Li, P. E. Specht, P. Cao, W. Chen, Y. K. Vohra, L. Dresselhaus-Marais, Phase Transitions of Eutectic High Entropy Alloy AlCoCrFeNi 2.1 Under Shock Compression. Advanced Engineering Materials, e202502073 (2026).

• M. Zhou, Q. Wang, S. Chen, S. Takagi, K. Ichiyanagi, S. Nozawa, R. Fukaya, J. Li, L. Xu, Y. Yu, Q. Wu, J. Hu, First In Situ Observation of Partial Dislocation-Mediated Plastic Flow in Shocked Single-Crystal Aluminum. Ultrafast Science 5, 0111 (2025).

• J. Li, L. Xu, S. Takagi, Q. Wang, J. Yang, M. Zhou, S. Chen, K. Miyanishi, K. Sueda, T. Yabuuchi, K. Ichiyanagi, H. Nakamura, A. Amouretti, N. Ozaki, Q. Wu, J. Hu, Kinetics of the bct-bcc phase transformation in tin revealed by ultrafast X-ray diffraction. Applied Physics Letters 126, 264102 (2025).

• J. Li, Q. Wang, L. Xu, L. Liu, H. Zhang, S. Takagi, K. Ichiyanagi, R. Fukaya, S. Nozawa, J. Hu, In situ observation of the phase transformation kinetics of bismuth during shock release, Chinese Physics B 33, 046401 (2024).

• S. Takagi, K. Inukai, N. Kawai, S. Nozawa, A. Kyono, R. Fukaya, S. Adachi, K. Ichiyanagi, Visualization of transformation toughening of zirconia ceramics during dynamic fracture, Applied Physics Letters 118, 231901 (2021).

• K. Ichiyanagi, S. Takagi, N. Kawai, R. Fukaya, S. Nozawa, K. G. Nakamura, K.-D. Liss, M. Kimura, S. Adachi, Microstructural deformation process of shock-compressed polycrystalline aluminum, Scientific Reports 9(1) (2019).

放射光施設での装置・手法開発

• S. Takagi, K. Ichiyanagi, A. Kyono, S. Nozawa, N. Kawai, R. Fukaya, N. Funamori, S. Adachi, Development of shock-dynamics study with synchrotron-based time-resolved X-ray diffraction using an Nd:glass laser system, Journal of Synchrotron Radiation 27(2) 371 (2020).

学歴

• 博士　筑波大学　2020