Diffusion-driven transient hydrogenation in metal superhydrides at extreme conditions.

ABSTRACT: In recent years, metal hydride research has become one of the driving forces of the high-pressure community, as it is believed to hold the key to superconductivity close to ambient temperature. While numerous novel metal hydride compounds have been reported and extensively investigated for their superconducting properties, little attention has been focused on the atomic and electronic states of hydrogen, the main ingredient in these novel compounds. Here, we present combined ¹H- and ¹³⁹La-NMR data on lanthanum superhydrides, LaH_x, (x = 10.2 - 11.1), synthesized after laser heating at pressures above 160 GPa. Strikingly, we found hydrogen to be in a highly diffusive state at room temperature, with diffusion coefficients in the order of 10^-6cm

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC11779868 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature