Synthesis of FeH5: A layered structure with atomic hydrogen slabs

• Autores: C.M. Pépin, G. Geneste, A. Dewaele
• Localización: Science, ISSN 0036-8075, Vol. 357, Nº 6349, 2017, págs. 382-385
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.