中国物理B ›› 2018, Vol. 27 ›› Issue (12): 126202-126202.doi: 10.1088/1674-1056/27/12/126202

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Shock temperature and reflectivity of precompressed H2O up to 350 GPa:Approaching the interior of planets

Zhi-Yu He(贺芝宇), Hua Shu(舒桦), Xiu-Guang Huang(黄秀光), Qi-Li Zhang(张其黎), Guo Jia(贾果), Fan Zhang(张帆), Yu-Chun Tu(涂昱淳), Jun-Yue Wang(王寯越), Jun-Jian Ye(叶君建), Zhi-Yong Xie(谢志勇), Zhi-Heng Fang(方智恒), Wen-Bing Pei(裴文兵), Si-Zu Fu(傅思祖)   

  1. 1 Shanghai Institute of Laser Plasma, CAEP, P. O. Box 800-229, Shanghai 201800, China;
    2 IFSA Collaborative Innovation Center, Shanghai Jiaotong University, Shanghai 200240, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    4 Center for High Pressure Science and Technology Advance Research, Beijing 100094, China
  • 收稿日期:2018-07-23 修回日期:2018-09-20 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Fan Zhang E-mail:innocentman001@163.com
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403200) and the Science Challenge Project (Grant No. TZ2016001).

Shock temperature and reflectivity of precompressed H2O up to 350 GPa:Approaching the interior of planets

Zhi-Yu He(贺芝宇)1, Hua Shu(舒桦)1, Xiu-Guang Huang(黄秀光)1,2, Qi-Li Zhang(张其黎)3, Guo Jia(贾果)1, Fan Zhang(张帆)1, Yu-Chun Tu(涂昱淳)1, Jun-Yue Wang(王寯越)4, Jun-Jian Ye(叶君建)1, Zhi-Yong Xie(谢志勇)1, Zhi-Heng Fang(方智恒)1, Wen-Bing Pei(裴文兵)1,2, Si-Zu Fu(傅思祖)1,2   

  1. 1 Shanghai Institute of Laser Plasma, CAEP, P. O. Box 800-229, Shanghai 201800, China;
    2 IFSA Collaborative Innovation Center, Shanghai Jiaotong University, Shanghai 200240, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    4 Center for High Pressure Science and Technology Advance Research, Beijing 100094, China
  • Received:2018-07-23 Revised:2018-09-20 Online:2018-12-05 Published:2018-12-05
  • Contact: Fan Zhang E-mail:innocentman001@163.com
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403200) and the Science Challenge Project (Grant No. TZ2016001).

摘要:

Using a combination of static precompression and laser-driven shock compression, shock temperature and reflectivity of H2O have been measured up to 350 GPa and 2.1×104 K. Here, two calibration standards were applied to enhance temperature measurement reliability. Additionally, in temperature calculations, the discrepancy in reflectivity between active probe beam wavelength and self-emission wavelength has been taken into account to improve the data's precision. Precompressed water's temperature-pressure data are in very good agreement with our quantum molecular dynamics model, suggesting a superionic conductor of H2O in the icy planets' deep interior. A sluggish slope gradually approaching Dulong-Petit limit at high temperature was found at a specific heat capacity. Also, high reflectivity and conductivity were observed at the same state. By analyzing the temperature-pressure diagram, reflectivity, conductivity and specific heat comprehensively at conditions simulating the interior of planets in this work, we found that as the pressure rises, a change in ionization appears; it is supposedly attributed to energetics of bond-breaking in the H2O as it transforms from a bonded molecular fluid to an ionic state. Such molecular dissociation in H2O is associated with the conducting transition because the dissociated hydrogen atoms contribute to electrical properties.

关键词: high temperature measurement, equation of state of water, laser-driven shock, diamond anvil cell

Abstract:

Using a combination of static precompression and laser-driven shock compression, shock temperature and reflectivity of H2O have been measured up to 350 GPa and 2.1×104 K. Here, two calibration standards were applied to enhance temperature measurement reliability. Additionally, in temperature calculations, the discrepancy in reflectivity between active probe beam wavelength and self-emission wavelength has been taken into account to improve the data's precision. Precompressed water's temperature-pressure data are in very good agreement with our quantum molecular dynamics model, suggesting a superionic conductor of H2O in the icy planets' deep interior. A sluggish slope gradually approaching Dulong-Petit limit at high temperature was found at a specific heat capacity. Also, high reflectivity and conductivity were observed at the same state. By analyzing the temperature-pressure diagram, reflectivity, conductivity and specific heat comprehensively at conditions simulating the interior of planets in this work, we found that as the pressure rises, a change in ionization appears; it is supposedly attributed to energetics of bond-breaking in the H2O as it transforms from a bonded molecular fluid to an ionic state. Such molecular dissociation in H2O is associated with the conducting transition because the dissociated hydrogen atoms contribute to electrical properties.

Key words: high temperature measurement, equation of state of water, laser-driven shock, diamond anvil cell

中图分类号:  (High-pressure effects in solids and liquids)

  • 62.50.-p
51.30.+i (Thermodynamic properties, equations of state) 64.30.-t (Equations of state of specific substances) 52.25.Kn (Thermodynamics of plasmas)