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Pépin, C. M.; Geneste, G.; Dewaele, A.; Mezouar, M.; Loubeyre, P.
Science (American Association for the Advancement of Science), 07/2017, Volume: 357, Issue: 6349Journal Article
High pressure promotes the formation of polyhydrides with unusually high hydrogen-tometal ratios. These polyhydrides have complex hydrogenic sublattices. We synthesized iron pentahydride (FeH₅) by a direct reaction between iron and H₂ above 130 gigapascals in a laser-heated diamond anvil cell. FeH₅ exhibits a structure built of atomic hydrogen only. It consists of intercalated layers of quasicubic FeH₃ units and four-plane slabs of thin atomic hydrogen. The distribution of the valence electron density indicates a bonding between hydrogen and iron atoms but none between hydrogen atoms, presenting a two-dimensional metallic character. The discovery of FeH₅ suggests a low-pressure path to make materials that approach bulk dense atomic hydrogen.
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