[P-CG22] Shock responses of planetary materials elucidated from meteorites and dynamic compression experiments

[PCG22-P02] Shock-compressed behavior
of quartz by XFEL

*Tomoko Sato¹, Yoshinori Tange², Yusuke Seto³, Toshimori Sekine^4,5, Norimasa Ozaki⁴, Toyohito Nishikawa⁴, Kohei Miyanishi⁴, Kensuke Matsuoka⁴, Ryosuke Kodama⁴, Tadashi Togashi², Yuichi Inubushi², Toshinori Yabuuchi⁶, Makina Yabashi⁶ (1.Hiroshima University, 2.Japan Synchrotron Radiation Research Institute, 3.Kobe University, 4.Osaka University, 5.Center for High Pressure Science &Technology Advanced Research, 6.RIKEN)

Keywords:Shock compression, in-situ X-ray diffraction, quartz

We have conducted x-ray diffraction measurement (XRD) with femtosecond x-ray pulses generated by the x-ray free electron laser (XFEL) to observe lattice dynamics and phase transformation of single-crystal quartz under high strain-rate shock compression (~10⁹ s^-1) and high pressure. Single-crystal quartz samples were shock-compressed by high-power short- and long-pulse lasers. In the short-pulse experiments, the lattice was reduced to 15% and 1.5% in the direction parallel and perpendicular to the compression axis, respectively. The sample was uniaxially compressed over its known Hugoniot elastic limit. In the long-pulse experiments, three different states were observed. Polycrystalline stishovite appeared at first, and elastically compressed state and a topotaxially transformed new phase were observed successively.