Synthesis of FeH5: 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 (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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Science, American Association for the Advancement of Science, 2017, 357 (6349), pp.382-385. 〈http://science.sciencemag.org/content/357/6349/382〉. 〈10.1126/science.aan0961 〉
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https://hal-cea.archives-ouvertes.fr/cea-01588320
Contributeur : Céline Rodier <>
Soumis le : vendredi 15 septembre 2017 - 14:48:01
Dernière modification le : jeudi 26 juillet 2018 - 12:08:33

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C. M. Pépin, G. Geneste, A. Dewaele, M. Mezouar, P. Loubeyre. Synthesis of FeH5: A layered structure with atomic hydrogen slabs. Science, American Association for the Advancement of Science, 2017, 357 (6349), pp.382-385. 〈http://science.sciencemag.org/content/357/6349/382〉. 〈10.1126/science.aan0961 〉. 〈cea-01588320〉

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