Synthesis and properties of selenium trihydride at high pressures

Year: 2018

Authors: Zhang X., Xu W., Wang Y., Jiang SQ., Gorelli FA., Greenberg E., Prakapenka VB., Goncharov AF.

Autors Affiliation: Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China; Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China; CNR INO, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; European Lab Non Linear Spect LENS, I-50019 Sesto Fiorentino, Italy; Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA; Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA.

Abstract: The chemical reaction products of molecular hydrogen (H-2) with selenium (Se) are studied by synchrotron x-ray diffraction (XRD) and Raman spectroscopy at high pressures. We find that a common H2Se is synthesized at 0.3 GPa using laser heating. Upon compression at 300 K, a crystal of the theoretically predicted Cccm H3Se has been grown at 4.6 GPa. At room temperature, H3Se shows a reversible phase decomposition after laser irradiation above 8.6 GPa, but remains stable up to 21 GPa. However, at 170 K Cccm H3Se persists up to 39.5 GPa based on XRD measurements, while low-temperature Raman spectra weaken and broaden above 23.1 GPa. At these conditions, the sample is visually nontransparent and shiny suggesting that metallization occurred.

Journal/Review: PHYSICAL REVIEW B

Volume: 97 (6)      Pages from: 64107-1  to: 64107-7

More Information: This work was supported by National Natural Science Foundation of China under Grants No. 21473211, No. 11674330, No. 11604342, No. 11504382, and No. 51727806, Science Challenge Project No. TZ2016001. A.F.G. was supported by the Chinese Academy of Sciences visiting professorship for senior international scientists (Grant No. 2011T2J20) and Recruitment Program of Foreign Experts. GSECARS is supported by the US NSF (EAR-1128799, DMR-1231586) and DOE Geosciences (DE-FG02-94ER14466). Use of the APS was supported by the DOE-BES under Contract No. DEAC02-06CH11357. We thank Mario Santoro, Maddury Somayazulu, Eugene Gregoryanz, and Xia-Jia Chen for useful comments and suggestions. We thank Nicholas Holtgrewe for the excellent technical support at GSECARS. We thank Yu-Sheng Chen (ChemMatCARS) for help with a cryostream N2 refrigerator. We also thank the anonymous referee for sharing with us the results of unpublished calculations of the electronic band structure of H3Se.
KeyWords: Diffraction Data; Superconductivity; Temperature; Transitions; Hydride; Program; Phase; Raman; Cell
DOI: 10.1103/PhysRevB.97.064107

Citations: 15
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