Studies of the EPR parameters and defect models for three Er3+ impurity centers in ThO2 crystals.
The electron paramagnetic resonance (EPR) parameters (g factors and hyperfine structure constants of the ground state, and g factors of the first excited state) of three (one cubic and two trigonal) Er(3+) centers in fluoride-type ThO(2) crystal are studied from a diagonalization (of energy matrix) method. In the method, the Zeeman and hyperfine interaction terms are added to the classical Hamiltonian, and a 52 x 52 energy matrix concerning the ground multiplet (4)I(15/2) and the first to third excited multiplets (4)I(13/2), (4)I(11/2) and (4)I(9/2) is established for a 4f(11) ion in trigonal crystal field and under an external magnetic field. From the studies, the EPR parameters for three Er(3+) centers in ThO(2) are reasonably explained, the defect models for the two trigonal Er(3+) centers suggested in the previous paper are confirmed and the defect structures of the two trigonal centers are obtained. The results are discussed.
Department of Material Science, Sichuan University, Chengdu 610064, PR China. zhengwc1@163.com
Wen-Chen
WC
Zheng
Gui-Qiang
GQ
Qu
Hong-Gang
HG
Liu
Wei-Qing
WQ
Yang
D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D004871:Erbium / Q000737:chemistry*; D008956:Models, Chemical; D013911:Thorium Dioxide / Q000737:chemistry*
D004871:Erbium; D013911:Thorium Dioxide