Moessbauer Studies of Dilute Erbium Impurities in Zirconium Hydrides

摘要

Hyperfine spectra are reported for Er present as a dilute impurity in the fluorite structure compound delta-ZrH sub 1 sub 5 and the tetragonally distorted fluorite epsilon-ZrH sub 1 sub 87 . In both cases, the hyperfine spectra are identical and show cubic symmetry around the Er ion regardless of the host crystal structure, showing the formation of a locally cubic Er-hydrogen cluster. Paramagnetic relaxation frequencies are also identical in the two phases, in spite of large changes in the electronic density of states. Mechanisms for the formation of such Er-hydrogen clusters are discussed. (ERA citation 04:027244)