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<p>In this study, we aimed to evaluate the shock-induced behavior of calcite (CaCO<sub>3</sub>), a potential source of CO and/or CO<sub>2</sub>. To this end, we experimentally investigated the time evolution of calcite during shock compression and decompression processes at shock pressures up to 234 ± 19&#xa0;GPa using an ultrafast time-resolved X-ray diffraction (XRD) coupled with a laser-driven shock compression system. The XRD analysis of shocked calcite showed that the amorphization occurred in the shock compression stage at pressures above 86 ± 7&#xa0;GPa, and that the decomposition reaction, i.e., CaCO<sub>3</sub> = CaO + CO<sub>2</sub>, was not observed in the decompression stage within the nanosecond timescale. This observation indicated that in addition to pressure and temperature, the shock duration (reaction time) is also a critical factor affecting shock-induced structural changes, such as amorphization and decomposition. Furthermore, the nanosecond laser shock employed in this study may be applied to enhance understanding regarding the impact phenomena of micrometer to submillimeter sized projectiles. The present results suggest that the shock-induced decomposition of calcite does not occur during micrometeorite impacts.</p>

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In situ observation of shock-induced structural evolution of calcite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月4日

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  • Yuhei Umeda,
  • Norimasa Ozaki,
  • Toshimori Sekine,
  • Yoichiro Hironaka,
  • Yuichi Inubushi,
  • Kento Katagiri,
  • Ryosuke Kodama,
  • Kohei Miyanishi,
  • Hirotaka Nakamura,
  • Tomoko Sato,
  • Yusuke Seto,
  • Keiichi Sueda,
  • Tadashi Togashi,
  • Naotaka Tomioka,
  • Toshinori Yabuuchi,
  • Makina Yabashi,
  • Takuo Okuchi

摘要

In this study, we aimed to evaluate the shock-induced behavior of calcite (CaCO3), a potential source of CO and/or CO2. To this end, we experimentally investigated the time evolution of calcite during shock compression and decompression processes at shock pressures up to 234 ± 19 GPa using an ultrafast time-resolved X-ray diffraction (XRD) coupled with a laser-driven shock compression system. The XRD analysis of shocked calcite showed that the amorphization occurred in the shock compression stage at pressures above 86 ± 7 GPa, and that the decomposition reaction, i.e., CaCO3 = CaO + CO2, was not observed in the decompression stage within the nanosecond timescale. This observation indicated that in addition to pressure and temperature, the shock duration (reaction time) is also a critical factor affecting shock-induced structural changes, such as amorphization and decomposition. Furthermore, the nanosecond laser shock employed in this study may be applied to enhance understanding regarding the impact phenomena of micrometer to submillimeter sized projectiles. The present results suggest that the shock-induced decomposition of calcite does not occur during micrometeorite impacts.