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Synthesis and stability of hydrogen selenide compounds at high pressure

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5004242· OSTI ID:1410118
 [1];  [2];  [1];  [2];  [3];  [2]
  1. Univ. of Edinburgh, Scotland (United Kingdom). School of Chemistry and Centre for Science at Extreme Conditions
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Univ. of Edinburgh, Scotland (United Kingdom). School of Chemistry and Centre for Science at Extreme Conditions
+ Show Author Affiliations
The observation of high-temperature superconductivity in hydride sulfide (H2S) at high pressures has generated considerable interest in compressed hydrogen-rich compounds. High-pressure hydrogen selenide (H2Se) has also been predicted to be superconducting at high temperatures; however, its behaviour and stability upon compression remains unknown. In this study, we synthesize H2Se in situ from elemental Se and molecular H2 at pressures of 0.4 GPa and temperatures of 473 K. On compression at 300 K, we observe the high-pressure solid phase sequence (I-I'-IV) of H2Se through Raman spectroscopy and x-ray diffraction measurements, before dissociation into its constituent elements. Through the compression of H2Se in H2 media, we also observe the formation of a host-guest structure, (H2Se)2H2, which is stable at the same conditions as H2Se, with respect to decomposition. These measurements show that the behaviour of H2Se is remarkably similar to that of H2S and provides further understanding of the hydrogen chalcogenides under pressure.
Research Organization:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; NA0001974
OSTI ID:
1410118
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 18 Vol. 147; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (2)

Structural, electronic, vibrational, and superconducting properties of hydrogenated chlorine journal August 2018
Elastic properties of single crystal hydrogen sulfide: A Brillouin scattering study under high pressure-temperature journal September 2018

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Chalcogenides
Chemical compounds
Chemical elements
Crystal structure
High temperature superconductivity
Raman spectroscopy
Sulfur compounds
Synchrotrons
X-ray diffraction