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| Journal Article | PUBDB-2025-03808 |
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2025
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.134.196102 doi:10.3204/PUBDB-2025-03808
Abstract: Through laser-heated diamond anvil cell experiments, we synthesize a series of rubidium superhydrides and explore their properties with synchrotron x-ray powder diffraction and Raman spectroscopy measurements, combined with density functional theory calculations. Upon heating rubidium monohydride embedded in H$_2$ at a pressure of 18 GPa, we form RbH$_9$−I, which is stable upon decompression down to 8.7 GPa, the lowest stability pressure of any known superhydride. At 22 GPa, another polymorph, RbH$_9$−II is synthesised at high temperature. Unique to the Rb-H system among binary metal hydrides is that further compression does not promote the formation of polyhydrides with higher hydrogen content. Instead, heating above 87 GPa yields RbH$_5$, which exhibits two polymorphs (RbH$_5$−I and RbH$_5$−II). All of the crystal structures comprise a complex network of quasimolecular H$_2$ units and H$^−$ anions, with RbH$_5$providing the first experimental evidence of linear H$^−_3$ anions.
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