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

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

*佐藤 友子¹、丹下 慶範²、瀬戸 雄介³、関根 利守^4,5、尾崎 典雅⁴、西川 豊人⁴、宮西 宏併⁴、松岡 健之⁴、兒玉 了祐⁴、富樫 格²、犬伏 雄一²、籔内 俊毅⁶、矢橋 牧名⁶ (1.広島大学、2.高輝度光科学研究センター、3.神戸大学、4.大阪大学、5.北京高压科学研究中心、6.理化学研究所)

キーワード：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.