Synthesis of FeH<sub>5</sub>: A layered structure with atomic hydrogen slabs.
basic_science · Level V
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- Record sourced from PubMed, PMID 28751605.
- Also identified by DOI 10.1126/science.aan0961.
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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<sub>5</sub>) by a direct reaction between iron and H<sub>2</sub> above 130 gigapascals in a laser-heated diamond anvil cell. FeH<sub>5</sub> exhibits a structure built of atomic hydrogen only. It consists of intercalated layers of quasicubic FeH<sub>3</sub> 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<sub>5</sub> suggests a low-pressure path to make materials that approach bulk dense atomic hydrogen.