| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Synthesis of ternary compound in H-S-Se system at high pressures |
| Xiao Zhang(张晓)1,2,† |
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 |
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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.
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Received: 13 February 2021
Revised: 08 April 2021
Accepted manuscript online: 14 April 2021
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PACS:
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78.30.-j
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(Infrared and Raman spectra)
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82.40.Fp
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(Shock wave initiated reactions, high-pressure chemistry)
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74.70.-b
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(Superconducting materials other than cuprates)
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| Fund: 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). |
Corresponding Authors:
Xiao Zhang
E-mail: xiaozhang@issp.ac.cn
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Cite this article:
Xiao Zhang(张晓) Synthesis of ternary compound in H-S-Se system at high pressures 2021 Chin. Phys. B 30 127801
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