Unitized research of the optical and EPR spectral data for Cr³⁺ ions in La₃Ga₅Ge O₁₄ crystal

详细信息    查看全文

• 作者：Xiao-Xuan Wu^a ; ^{wxxdd@163.com} ; Wen-Chen Zheng^b
• 关键词：Optical bands ; Electron paramagnetic resonance ; Crystal- and ligand-field theory ; La3Ga5GeO14 (LGGO) ; Cr3+
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：131
• 期：Complete
• 页码：953-956
• 全文大小：344 K
• 卷排序：131

文摘

The complete diagonalization (of energy matrix) method founded on the two-spin-orbit-parameter model is employed to calculate uniformly the optical and EPR spectral data for Cr3+ ions at the trigonal octahedral Ga3+ site of La3Ga5GeO14 (LGGO) crystal. Differing from the one-spin-orbit-parameter model in the conventional crystal field theory where the contribution only from spin-orbit parameter of central dn ions is considered, the present model takes account of the contributions from both the spin-orbit parameters of dn ion and ligand ion via covalence effect. The calculated results show that the observed eight optical and EPR spectral data (five optical bands and three EPR parameters g//, g⊥ and D) can be rationally explained with only three adjustable parameters. The small impurity-caused local lattice relaxation is due to the similarity of valence state and size between the substitutional ion Cr3+ and the host ion Ga3+.