Structural and Valence Changes of Europium Hydride Induced by Application of High-PressureH2

2011/07/05 by T. Matsuoka, Hiroshi Fujihisa, Naohisa Hirao +8 · 1 citation
Physics and Astronomy · Materials Science · #Rare-earth and actinide compounds #Hydrogen Storage and Materials #Advanced Chemical Physics Studies

paper · doi:10.1103/physrevlett.107.025501

openalex publication_date 2011/07/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/22

Abstract

Europium hydride EuH_x, when exposed to high-pressure H₂, has been found to exhibit the following structural and valence changes: Pnma(x=2,divalent)\ensuremath→P6₃/mmc(x=2,7.2--8.7 GPa)\ensuremath→I4/m(x>2,8.7--9.7 GPa)\ensuremath→I4/mmm(x>2,9.7 GPa\ensuremath-,trivalent). With a trivalent character and a distorted cubic fcc structure, the I4/mmm structure is the \ensuremathβ phase commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuH_x is no longer an irregular member of the rare-earth metal hydrides.

Citations

• Calibration of the ruby pressure gauge to 800 kbar under quasi‐hydrostatic conditions
• Soft self-consistent pseudopotentials in a generalized eigenvalue formalism

Cited by

• Lanthanide [wikipedia]