八面体
雅恩-泰勒效应
电子顺磁共振
杂质
三角晶系
平面的
星团(航天器)
格子(音乐)
材料科学
化学
结晶学
凝聚态物理
晶体结构
分子物理学
核磁共振
物理
离子
计算机图形学(图像)
有机化学
计算机科学
声学
程序设计语言
作者
Huaming Zhang,Wenbo Xiao
标识
DOI:10.1016/j.jallcom.2018.02.209
摘要
The EPR parameters of the impurity Cu2+ and Ni+ in LiNbO3 are theoretically studied from the perturbation formulas for 3d9 ions under rhombically elongated and compressed octahedra, respectively. In both centers, the impurity Cu2+ and Ni+ ions was ascribed to occupy the host trigonally-distorted octahedral Li+ sites and the octahedrons experience the Jahn-Teller distortion from trigonal to rhombically -elongated and -compressed, respectively. The elongated [CuO6]10− cluster (and compressed [NiO6]11− cluster) are ascribed to suffering the axial elongation of 0.102 Å (and compression of 0.062 Å) along z-axis and the planar bonds are found to experience the relative variation of 0.023 Å (and 0.032 Å), respectively, due to the Jahn-Teller effect. The calculated EPR parameters based on the above lattice distortions agree reasonably with the experimental data, and the local structures of the impurity centers are discussed.
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