Tetragonal distortions of the octahedral environments of Cr3+, Fe3+ and Gd3+ ions in A2CdF4 (A = Rb,Cs) and ACdF3 crystals |
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| Authors: | Zheng Wen-Chen |
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| Institution: | 1. Department of Material Science , Sichuan University , Chengdu, 610064, China;2. International Center for Materials Physics, Academia Sinica , Shenyang, 110015, China |
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| Abstract: | Abstract The tetragonal distortions of local octahedral environments of Cr3+, Fe3+ and Gd3+ ions in Rb2CdF4, Cs2CdF4, RbCdF3 and CsCdF3 crystals have been studied by analyzing their EPR spectra. From the studies, it is found that the tetragonal distortions for Cr3+ and Fe3+ impurity ions, which substitute Cd2+ and have nearly the same ionic radius, are close to each other, whereas that for Gd3+ impurity ion, having a larger ionic radius, is larger than those for Cr3+ and Fe3+ ions in the same crystal. It appears that not only the impurity-ligand distance, but also the tetragonal distortions of impurity centres in crystals are closely related to the size of impurity. |
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| Keywords: | Electron paramagnetic resonance Local structure Crystal-field theory Superposition model Cr3+ Fe3+ Gd3+ A2CdF4 (A = Rb Cs) ACdF3 |
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