Hydrogen sulfide at high pressure: change in stoichiometry

Abstract

Hydrogen-sulfide (H2S) was studied by x-ray synchrotron diffraction (XRD) and Raman spectroscopy up to 150 GPa at 180-295 K and by quantum-mechanical variable-composition evolutionary simulations. The experiments show that H2S becomes unstable with respect to formation of new compounds with different structure and composition, including Cccm and a body-centered-cubic (bcc) like (R3m or Im-3m) H3S, the latter one predicted previously to show a record-high superconducting transition temperature, Tc of 203 K. These experiments provide experimental ground for understanding of this record high Tc. The experimental results are supported by theoretical structure searches that suggest the stability of new H3S, H4S3, H5S8, H3S5, and HS2 compounds at elevated pressures.

14 pages, 5 figures, 2 tables

References in corpus (7)

• Conventional superconductivity at 203 K at high pressures
• Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
• Pressure-induced decomposition of solid hydrogen sulfide
• Quantum Hydrogen-Bond Symmetrization and High-Temperature Superconductivity in Hydrogen Sulfide
• What superconducts in sulfur hydrides under pressure, and why
• First-principles study of the pressure and crystal-structure dependences of the superconducting transition temperature in compressed sulfur hydrides
• Dissociation products and structures of solid H2S at strong compression

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• Materials under high pressure: A chemical perspective
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• Structure and composition of C-S-H compounds up to 143 GPa
• Superconducting incommensurate host-guest phases in compressed elemental sulfur
• The road map toward room temperature superconductivity: manipulating different pairing channels in systems composed of multiple electronic components
• Structural Diversity and Superconductivity in S-P-H Ternary Hydrides Under Pressure
• High-Pressure Hydrogen Sulfide by Diffusion Quantum Monte Carlo
• The dominance of non-electron-phonon charge carrier interaction in highly-compressed superhydrides
• Synthesis and structure of carbon doped H3S compounds at high pressure
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• Advanced McMillan's equation and its application for the analysis of highly-compressed superconductors
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• Crystal Chemistry at High Pressure