Research Professor / Korea University
E-mail: stakagi(at)korea.ac.kr
Embedded Files
Research outcomes
Research outcomes
Shock-Induced Structural Phase Transitions in Minerals
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).
Static High-Pressure Phase Transitions in Minerals
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).
Mineral Synthesis and Physical Properties
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).
Dynamic Compression Behavior of Solids in Condensed Matter and Materials Science
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).
Instrumentation and Method Development at Synchrotron Facilities
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).
Employment
Employment
Korea University, Department of Earth and Environmental Sciences, Planetary and Astromaterials Lab., Research Professor (2025.4 - present)
Tokyo University of Science, Faculty of Advanced Engineering, Department of Materials Science and Technology, Assistant Professor (2024.4 - 2025.3)
(Collaborative Researcher) Carnegie Institution for Science (host: S. Tracy) (2024.4 - present)Carnegie Institution for Science, Earth and Planets laboratory, Postdoctoral Fellow (2022.12 - 2024.3)
Japan Society for the Promotion of Science (JSPS), Research Fellow PD (host: KEK, S. Nozawa) (2021.4 - 2022.12)
(Visiting Researcher) Carnegie Institution for Science (host: S. Tracy) (2021.11 - 2022.12)
(Visiting Researcher) National Institute for Materials Science (NIMS) (host: M. Miyakawa) (2021.9 - 2022.3)High Energy Accelerator Research Organization (KEK), Institute of Materials Structure Science, Researcher (2020.4 - 2021.3)
Japan Society for the Promotion of Science (JSPS), Research Fellow DC (host: University of Tsukuba, A. Kyono) (2018.4 - 2020.3)
Education
Education
Ph.D. University of Tsukuba, 2020
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