中国物理B ›› 2022, Vol. 31 ›› Issue (7): 76102-076102.doi: 10.1088/1674-1056/ac5980

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Structural evolution and molecular dissociation of H2S under high pressures

Wen-Ji Shen(沈文吉)1, Tian-Xiao Liang(梁天笑)1, Zhao Liu(刘召)1, Xin Wang(王鑫)1, De-Fang Duan(段德芳)1, Hong-Yu Yu(于洪雨)1,†, and Tian Cui(崔田)2,1,‡   

  1. 1 College of Physics, Jilin University, Changchun 130012, China;
    2 Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
  • 收稿日期:2021-10-28 修回日期:2022-01-30 接受日期:2022-03-02 出版日期:2022-06-09 发布日期:2022-07-19
  • 通讯作者: Hong-Yu Yu, Tian Cui E-mail:yuhongyu@jlu.edu.cn;cuitian@jlu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11704143, 11804113, 11604023, and 12122405).

Structural evolution and molecular dissociation of H2S under high pressures

Wen-Ji Shen(沈文吉)1, Tian-Xiao Liang(梁天笑)1, Zhao Liu(刘召)1, Xin Wang(王鑫)1, De-Fang Duan(段德芳)1, Hong-Yu Yu(于洪雨)1,†, and Tian Cui(崔田)2,1,‡   

  1. 1 College of Physics, Jilin University, Changchun 130012, China;
    2 Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
  • Received:2021-10-28 Revised:2022-01-30 Accepted:2022-03-02 Online:2022-06-09 Published:2022-07-19
  • Contact: Hong-Yu Yu, Tian Cui E-mail:yuhongyu@jlu.edu.cn;cuitian@jlu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11704143, 11804113, 11604023, and 12122405).

摘要: Solid H$_{2}$S as the precursor for H$_{3}$S with incredible superconducting properties under high pressure, has recently attracted extensive attention. Here in this work, we propose two new phases of H$_{2}$S with $P$4$_{2}/n$ and $I$4$_{1}/a$ lattice symmetries in a pressure range of 0 GPa-30 GPa through first-principles structural searches, which complement the phase transition sequence. Further an $ab initio$ molecular dynamics simulation confirms that the molecular phase $P2/c$ of H$_{2}$S is gradually dissociated with the pressure increasing and reconstructs into a new $P$2$_{1}/m$ structure at 160 GPa, exhibiting the superconductivity with $T_{\rm c}$ of 82.5 K. Our results may provide a guidance for the theoretical study of low-temperature superconducting phase of H$_{2}$S.

关键词: high pressure, crystal structure, phase transition, superconductivity

Abstract: Solid H$_{2}$S as the precursor for H$_{3}$S with incredible superconducting properties under high pressure, has recently attracted extensive attention. Here in this work, we propose two new phases of H$_{2}$S with $P$4$_{2}/n$ and $I$4$_{1}/a$ lattice symmetries in a pressure range of 0 GPa-30 GPa through first-principles structural searches, which complement the phase transition sequence. Further an $ab initio$ molecular dynamics simulation confirms that the molecular phase $P2/c$ of H$_{2}$S is gradually dissociated with the pressure increasing and reconstructs into a new $P$2$_{1}/m$ structure at 160 GPa, exhibiting the superconductivity with $T_{\rm c}$ of 82.5 K. Our results may provide a guidance for the theoretical study of low-temperature superconducting phase of H$_{2}$S.

Key words: high pressure, crystal structure, phase transition, superconductivity

中图分类号:  (Crystallographic aspects of phase transformations; pressure effects)

  • 61.50.Ks
82.33.Pt (Solid state chemistry) 74.25.-q (Properties of superconductors)