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001     637199
005     20250907054640.0
024 7 _ |a 10.1103/PhysRevLett.134.196102
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100 1 _ |a Kuzovnikov, Mikhail A.
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245 _ _ |a High Pressure Synthesis of Rubidium Superhydrides
260 _ _ |a College Park, Md.
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520 _ _ |a 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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700 1 _ |a Wang, Busheng
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700 1 _ |a Wang, Xiaoyu
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700 1 _ |a Marqueño, Tomas
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700 1 _ |a Shuttleworth, Hannah A.
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700 1 _ |a Strain, Calum
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700 1 _ |a Gregoryanz, Eugene
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700 1 _ |a Zurek, Eva
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700 1 _ |a Peña-Alvarez, Miriam
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700 1 _ |a Howie, Ross
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773 _ _ |a 10.1103/PhysRevLett.134.196102
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