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

C. Pépin; G. Geneste; A. Dewaele; M. Mezouar; P. Loubeyre

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

C. Pépin ^{1, 2, *} G. Geneste ¹ A. Dewaele ¹ M. Mezouar ³ P. Loubeyre ^{1, *}

* Corresponding author

1 DAM/DIF - DAM Île-de-France

2 EPSL - Earth and Planetary Science Laboratory [Lausanne]

3 ESRF - European Synchrotron Radiation Facility

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

Domain :

Chemical Sciences / Material chemistry

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https://hal-cea.archives-ouvertes.fr/cea-01890503
Contributor : Bruno Savelli <>
Submitted on : Monday, October 8, 2018 - 4:33:35 PM
Last modification on : Monday, October 15, 2018 - 3:54:03 PM

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

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

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