中国物理B ›› 2021, Vol. 30 ›› Issue (12): 127801-127801.doi: 10.1088/1674-1056/abf7aa

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Synthesis of ternary compound in H-S-Se system at high pressures

Xiao Zhang(张晓)1,2,†   

  1. 1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences(CAS), Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2021-02-13 修回日期:2021-04-08 接受日期:2021-04-14 出版日期:2021-11-15 发布日期:2021-11-23
  • 通讯作者: Xiao Zhang E-mail:xiaozhang@issp.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51672279, 51727806, 11874361, and 11774354), the Science Challenge Project, China (Grant No. TZ2016001), the CAS Innovation Fund (Grant No. CXJJ-19-B08), and the CASHIPS Director's Fund (Grant No. YZJJ201705).

Synthesis of ternary compound in H-S-Se system at high pressures

Xiao Zhang(张晓)1,2,†   

  1. 1 Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences(CAS), Hefei 230031, China;
    2 University of Science and Technology of China, Hefei 230026, China
  • Received:2021-02-13 Revised:2021-04-08 Accepted:2021-04-14 Online:2021-11-15 Published:2021-11-23
  • Contact: Xiao Zhang E-mail:xiaozhang@issp.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51672279, 51727806, 11874361, and 11774354), the Science Challenge Project, China (Grant No. TZ2016001), the CAS Innovation Fund (Grant No. CXJJ-19-B08), and the CASHIPS Director's Fund (Grant No. YZJJ201705).

摘要: The chemical reaction products of elemental sulfur (S), selenium (Se), and molecular hydrogen (H2) at high pressures and room temperature are probed by Raman spectroscopy. Two known compounds H2S and H2Se can be synthesized after laser heating at pressures lower than 1 GPa. Under further compression at room temperature, an H2S-H2Se and an H2S-H2Se-H2 van der Waals compounds are synthesized at 4 GPa and 6 GPa, respectively. The later is of guest-host structure and can be identified as (H2S)x(H2Se)(2-x)H2. It can be maintained up to 37 GPa at least, and the stability of its H2Se molecules is extended:the H-Se stretching mode can be detected at least to 36 GPa but disappears at 22 GPa in (H2Se)2H2. The pressure dependence of S-H and Se-H stretching modes of this ternary compound is in line with that of (H2S)2H2 and (H2Se)2H2, respectively. However, its hydrogen subsystem only shows the relevance to (H2S)2H2, indicating that this ternary compound can be viewed as H2Se-replaced partial H2S of (H2S)2H2.

关键词: hydride, high pressure, Raman spectroscopy

Abstract: The chemical reaction products of elemental sulfur (S), selenium (Se), and molecular hydrogen (H2) at high pressures and room temperature are probed by Raman spectroscopy. Two known compounds H2S and H2Se can be synthesized after laser heating at pressures lower than 1 GPa. Under further compression at room temperature, an H2S-H2Se and an H2S-H2Se-H2 van der Waals compounds are synthesized at 4 GPa and 6 GPa, respectively. The later is of guest-host structure and can be identified as (H2S)x(H2Se)(2-x)H2. It can be maintained up to 37 GPa at least, and the stability of its H2Se molecules is extended:the H-Se stretching mode can be detected at least to 36 GPa but disappears at 22 GPa in (H2Se)2H2. The pressure dependence of S-H and Se-H stretching modes of this ternary compound is in line with that of (H2S)2H2 and (H2Se)2H2, respectively. However, its hydrogen subsystem only shows the relevance to (H2S)2H2, indicating that this ternary compound can be viewed as H2Se-replaced partial H2S of (H2S)2H2.

Key words: hydride, high pressure, Raman spectroscopy

中图分类号:  (Infrared and Raman spectra)

  • 78.30.-j
82.40.Fp (Shock wave initiated reactions, high-pressure chemistry) 74.70.-b (Superconducting materials other than cuprates)