# Synthesis of FeH$_5$: A layered structure with atomic hydrogen slabs

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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.
Document type :
Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01588320
Contributor : Céline Rodier <>
Submitted on : Friday, September 15, 2017 - 2:48:01 PM
Last modification on : Friday, May 24, 2019 - 2:46:13 PM

### Citation

C. M. 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-01588320⟩

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