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Synthesis and stability of hydrogen selenide compounds at high pressure.

The observation of high-temperature superconductivity in hydride sulfide (H2 S) at high pressures has generated considerable interest in compressed hydrogen-rich compounds. High-pressure hydrogen selenide (H2 Se) has also been predicted to be superconducting at high temperatures; however, its behaviour and stability upon compression remains unknown. In this study, we synthesize H2 Se 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 H2 Se through Raman spectroscopy and x-ray diffraction measurements, before dissociation into its constituent elements. Through the compression of H2 Se in H2 media, we also observe the formation of a host-guest structure, (H2 Se)2 H2 , which is stable at the same conditions as H2 Se, with respect to decomposition. These measurements show that the behaviour of H2 Se is remarkably similar to that of H2 S and provides further understanding of the hydrogen chalcogenides under pressure.

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