“Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice” (2019), by Nilesh P. Salke et al. Earth and Planetary Sciences research paper. Original abstract below, unchanged. A free PDF is available.

Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice

Nilesh P. Salke, M. Mahdi Davari Esfahani, Youjun Zhang et al. · October 1, 2019 · Earth and Planetary Sciences

Abstract

Hydrogen-rich superhydrides are believed to be very promising high- T c superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH 5 at 130 GPa and LaH 10 at 170 GPa. With the motivation of discovering new hydrogen-rich high- T c superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH 9 at 80–100 GPa in the laser-heated diamond anvil cell coupled with synchrotron X-ray diffraction. Ab initio calculations were carried out to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH 9 . CeH 9 crystallizes in a P6 3 /mmc clathrate structure with a very dense 3-dimensional atomic hydrogen sublattice at 100 GPa. These findings shed a significant light on the search for superhydrides in close similarity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH 9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.

Free PDF DOI: 10.1038/s41467-019-12326-y