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Ultrahigh-pressure shock compression of platinum up to 1.1 TPa: the melting and ionization
编号：264 访问权限：仅限参会人 更新：2024-04-26 00:16:26 浏览：158次 张贴报告

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摘要
The shock compression experiments on platinum (Pt) were carried out by combining the two-stage gas gun with the unique high-Z three-stage gas gun launcher technique. The shock Hugoniot of Pt was determined in a wide pressure range of 0.2-1.1 TPa. These data fill the gap between the two-stage gas gun and magnetically-driven shock experiments, and thereby we observe a clear softening behavior of Pt Hugoniot at the beginning of ~1.1 TPa. The ab-initio molecular dynamics simulations were also performed to reveal the response of Pt under ultrahigh-pressure compressions. The simulation results show that the melting of Pt under shock compression occurs at ~570 GPa, and a sudden increase in conductivity and free electron number density emerges at the beginning of the Hugoniot softening. The further electronic structure calculations indicate that the Hugoniot softening may be arised from the thermal excitation (ionization) of the 5d electrons and the localized 6s electrons in Pt under extreme shock compression. This work has gained further insight into the ionization behaviors of high-Z metal elements with complex electronic structures under ultrahigh-pressure compressions, which is of significance for understanding the partial ionization effect in the transition region from condensed matter to warm dense matter.
关键词
warm dense matter, platinum, ultrahigh pressure, shock-induced ionization
报告人
Zhi-Guo Li
China；National Key Laboratory of Shock Wave and Detonation Physics； Institute of Fluid Physics

稿件作者
Zhi-Guo Li China；National Key Laboratory of Shock Wave and Detonation Physics； Institute of Fluid Physics
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重要日期

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    05月13日

    2024

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    05月17日

    2024

  • 03月31日 2024

    注册截止日期

  • 04月15日 2024

    摘要截稿日期

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冲击波物理与爆轰物理全国重点实验室
浙江大学物理学院
中国核学会脉冲功率技术及其应用分会
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