Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1236901 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2006 | 4 Pages |
Abstract
The EPR parameters (zero-field splitting D and g factors gâ¥, gâ¥) and the first excited state splitting Î(2E) of the trigonal Cr3+-Vc centers (Vc denotes the cation vacancy in a C3 axis) in Cr3+-doped fluoroperovskites KMgF3, KZnF3, CsCdF3, CsCaF3, RbCdF3 and BaLiF3 are studied from the high-order perturbation formulas. From the studies, the defect structures (characterized by the vacancy-induced displacements Îx1 of Cr3+ ion and Îx2 of the three Fâ ion between Cr3+ and Vc) of these trigonal Cr3+-Vc centers are determined. It is found that the signs of displacements Îx1 and Îx2 are consistent with the expectations based on the electrostatic interactions, and the magnitudes of Îx1and Îx2 for Cr3+ in the inverse perovskite BaLiF3 are larger than those for Cr3+ in the classical perovskites. The results are discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Zheng Wen-Chen, Zhou Qing, Wu Xiao-Xuan, Mei Yang,