Investigation of the local structure and the effects of the orbit reduction factor on the EPR g-factors for octahedral (CrO6) cluster in TiO2:Cr and MgO:Cr systems |
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Authors: | Wen-Yan Tian Xiao-Yu Kuang Mei-Ling Duan Rui-Peng Chai Cai-Xia Zhang |
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Affiliation: | aInstitute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;bInternational Centre for Materials Physics, Academia Sinica, Shenyang 110016, China |
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Abstract: | A theoretical method for studying the inter-relation between electronic and molecular structure has been proposed based on the complete energy matrices for a d3 configuration ion in a tetragonal ligand-field. By means of this method, the local structure for Cr3+ ion doped in oxides TiO2 (anatase) and MgO has been determined. The calculated results indicate that the local structure of the (CrO6)9− cluster in TiO2:Cr3+ and MgO:Cr3+ systems exists as a compressed distortion relative to the regular octahedron. Meanwhile, the dependence of the EPR zero-field splitting parameter D on the local structure parameter ΔR (ΔR=R1−R2) has been revealed. In addition, the relation between the EPR g-factors (g,g,Δg) and the orbit reduction factor k has been discussed for the two systems, suggesting that the orbit reduction factor k is very important to understand the EPR g-factors. |
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Keywords: | Local structure EPR and optical spectra Orbit reduction effect |
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