Synthesis of FeH$_ $5 : A layered structure with atomic hydrogen slabs

Abstract : High pressure promotes the formation of polyhydrides with unusually high hydrogen-to-metal ratios. These polyhydrides have complex hydrogenic sublattices. We synthesized iron pentahydride (FeH$_5$) by a direct reaction between iron and H$_2$ above 130 gigapascals in a laser-heated diamond anvil cell. FeH$_5$ exhibits a structure built of atomic hydrogen only. It consists of intercalated layers of quasicubic FeH$_3$ 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 FeH$_5$ suggests a low-pressure path to make materials that approach bulk dense atomic hydrogen.
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Submitted on : Monday, October 8, 2018 - 4:33:35 PM
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C. Pépin, G. Geneste, A. Dewaele, M. Mezouar, P. Loubeyre. Synthesis of FeH$_ $5 : A layered structure with atomic hydrogen slabs. Science, American Association for the Advancement of Science, 2017, 357 (6349), pp.382 - 385. ⟨10.1126/science.aan0961⟩. ⟨cea-01890503⟩

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