Structural and Valence Changes of Europium Hydride Induced by Application of High-Pressure H2
Abstract
Europium hydride EuHx, when exposed to high-pressure H2, has been found to exhibit the following structural and valence changes: Pnma(x=2,divalent)→P63/mmc(x=2,7.2-8.7GPa)→I4/m(x>2,8.7-9.7GPa)→I4/mmm(x>2,9.7GPa-,trivalent). With a trivalent character and a distorted cubic fcc structure, the I4/mmm structure is the β phase commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuHx is no longer an irregular member of the rare-earth metal hydrides.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2011
- DOI:
- 10.1103/PhysRevLett.107.025501
- Bibcode:
- 2011PhRvL.107b5501M
- Keywords:
-
- 61.05.cp;
- 61.66.Fn;
- 76.80.+y;
- X-ray diffraction;
- Inorganic compounds;
- Mossbauer effect;
- other gamma-ray spectroscopy