title: On the effects of high temperature and high pressure on the hydrogen solubility in rhenium.
abstract: In situ x-ray diffraction experiments on rhenium hydride compressed up to 46 GPa reveal a hydrogen solubility (x) significantly larger than the previously assumed saturation limit of x ~ 0.38(4). In the layered anti-CdI(2)-type structure of rhenium hydride, the hydrogen solubility was found to increase to x ~ 0.5 at 15 GPa over time. When heated to temperatures above 420 K at pressures above 23 GPa, rhenium hydride undergoes an isomorphous phase transition into the NiAs-type structure accompanied by an increase in hydrogen solubility to x ~ 0.85. The formation of fully stoichiometric rhenium hydride is discussed.
authors.affiliation: SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
authors.forename: Thomas
authors.initials: T
authors.lastname: Scheler
authors.forename: Olga
authors.initials: O
authors.lastname: Degtyareva
authors.forename: Eugene
authors.initials: E
authors.lastname: Gregoryanz