Theoretical study of the dependence of EPR spectra on local structure for octahedral Cr3+ centres in oxides and fluorides series |
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Authors: | Rui-Peng Chai Mei-Ling Duan Cai-Xia Zhang Hong-Li Guo |
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Affiliation: | Institute of Atomic and Molecular Physics, Sichuan University , Chengdu 610065, China |
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Abstract: | A theoretical method for investigating the inter-relation between the EPR parameters and local structure has been established on the basis of the complete energy matrices for 3d3 configuration ions in both the trigonal and tetragonal ligand fields. By means of this method, the local structure of the octahedral Cr3+ centres in double molybdates series and spinels series as well as the perovskite-type fluorides series has been studied systematically. Furthermore, the dependence of the EPR zero-field splitting parameter D on the local structure parameters in both trigonal and tetragonal ligand-fields has been revealed, simultaneously. The inter-relation between the EPR parameters D and Δg(g // ??g ⊥) is also elucidated. |
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Keywords: | EPR spectra local lattice structure Cr3+ centres |
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