Synthesis and properties of selenium trihydride at high pressures

Year: 2018

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

Autors Affiliation: [Zhang, Xiao; Xu, Wan; Wang, Yu; Jiang, Shuqing; Gorelli, Federico A.; Goncharov, Alexander F.] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China.
[Zhang, Xiao; Xu, Wan; Wang, Yu; Goncharov, Alexander F.] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China.
[Gorelli, Federico A.] CNR INO, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy and European Lab Non Linear Spect LENS, I-50019 Sesto Fiorentino, Italy.
[Greenberg, Eran; Prakapenka, Vitali B.] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA.
[Goncharov, Alexander F.] 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.


Volume: 97 (6)      Pages from: 064107-1  to: 064107-7

KeyWords: hydrogen selenide; diffraction data; sulfur hydride; solid hydrogen; superconductivity
DOI: 10.1103/PhysRevB.97.064107

Citations: 14
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