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Title: Synthesis and stability of hydrogen selenide compounds at high pressure

Abstract

The observation of high-temperature superconductivity in hydride sulfide (H 2S) at high pressures has generated considerable interest in compressed hydrogen-rich compounds. High-pressure hydrogen selenide (H 2Se) has also been predicted to be superconducting at high temperatures; however, its behaviour and stability upon compression remains unknown. In this study, we synthesize H 2Se in situ from elemental Se and molecular H 2 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 H 2Se through Raman spectroscopy and x-ray diffraction measurements, before dissociation into its constituent elements. Through the compression of H 2Se in H 2 media, we also observe the formation of a host-guest structure, (H 2Se) 2H 2, which is stable at the same conditions as H 2Se, with respect to decomposition. These measurements show that the behaviour of H 2Se is remarkably similar to that of H 2S and provides further understanding of the hydrogen chalcogenides under pressure.

Authors:
 [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
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1410118
Grant/Contract Number:  
[DE-NA0001974; AC02-06CH11357]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
[ Journal Volume: 147; Journal Issue: 18]; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Synchrotrons; High temperature superconductivity; Crystal structure; Chemical elements; X-ray diffraction; Chemical compounds; Raman spectroscopy; Sulfur compounds; Chalcogenides

Citation Formats

Pace, Edward J., Binns, Jack, Peña Alvarez, Miriam, Dalladay-Simpson, Philip, Gregoryanz, Eugene, and Howie, Ross T. Synthesis and stability of hydrogen selenide compounds at high pressure. United States: N. p., 2017. Web. doi:10.1063/1.5004242.
Pace, Edward J., Binns, Jack, Peña Alvarez, Miriam, Dalladay-Simpson, Philip, Gregoryanz, Eugene, & Howie, Ross T. Synthesis and stability of hydrogen selenide compounds at high pressure. United States. doi:10.1063/1.5004242.
Pace, Edward J., Binns, Jack, Peña Alvarez, Miriam, Dalladay-Simpson, Philip, Gregoryanz, Eugene, and Howie, Ross T. Mon . "Synthesis and stability of hydrogen selenide compounds at high pressure". United States. doi:10.1063/1.5004242. https://www.osti.gov/servlets/purl/1410118.
@article{osti_1410118,
title = {Synthesis and stability of hydrogen selenide compounds at high pressure},
author = {Pace, Edward J. and Binns, Jack and Peña Alvarez, Miriam and Dalladay-Simpson, Philip and Gregoryanz, Eugene and Howie, Ross T.},
abstractNote = {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.},
doi = {10.1063/1.5004242},
journal = {Journal of Chemical Physics},
number = [18],
volume = [147],
place = {United States},
year = {2017},
month = {11}
}

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