A research on the g factors and defect model for the tetragonal Sm3+ center in KMgF3 crystal

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	A research on the g factors and defect model for the tetragonal Sm3+ center in KMgF3 crystal
	P. Su; Y. Mei; W. C. Zheng; H. G. Liu
	2013
发表期刊	Physica B-Condensed Matter
ISSN	0921-4526
卷号	420 页码:1-5
摘要	The g factors g(parallel to) and g(perpendicular to) for the tetragonal (SmF12)(9-) cluster due to Sm3+ occupying the 12-fold coordinated K+ site in KMgF3 perovskite are calculated from a diagonalization (of energy matrix) method. In the energy matrix, the crystal field parameters B-k(q) used are calculated from the superposition model with the intrinsic parameters (A) over bar (k)(R-0) close to those of (GdF12)(9-) clusters for Gd3+ in similar cubic perovskite c-RbZnF3. In the calculations, the applied defect model of tetragonal Sm3+ center in KMgF3 is that in which Sm3+ occupies the 12-fold coordinated K+ site associated with one (model A) or two (model B, where two K+ vacancies are at both sides of Sm3+) nearest K+ vacancies along the C-4 axis for partial or complete charge compensation. The calculation results reveal that when the calculated g(parallel to) and g(vertical bar) are in reasonable agreement with the experimental values, the tetragonal distortions of Sm3+ centers are, whether in model A or model B, very small because of the slight anisotropy of the observed g factors. So, we suggest that the defect model of Sm3+ center is that in which Sm3+ occupies the 12-fold coordinated K+ site associated with one or two next-nearest rather than nearest K+ vacancies along the C-4 axis to result in small tetragonal distortions and hence in the small anisotropy of g factors. The reasonableness of our suggested defect model is discussed. (c) 2013 Elsevier B.V. All rights reserved.
部门归属	[su ping ; zheng wen-chen ; liu hong-gang] sichuan univ, dept mat sci, chengdu 610064, peoples r china. [mei yang] mianyang normal univ, sch phys & elect engn, mianyang 621000, peoples r china. [zheng wen-chen] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. ; zheng, wc (reprint author), sichuan univ, dept mat sci, chengdu 610064, peoples r china. ; zhengwc1@163.com
关键词	Electron Paramagnetic Resonance Defect Structure Crystal-field Theory Kmgf3 Sm3++ Electron-paramagnetic-resonance Thermally Stimulated Luminescence Superposition-model Optical Spectroscopy Perovskite Kmgf3 Yb3++ Ions Ce3++ Parameters Field Impurities
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71472
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Su,Y. Mei,W. C. Zheng,et al. A research on the g factors and defect model for the tetragonal Sm3+ center in KMgF3 crystal[J]. Physica B-Condensed Matter,2013,420:1-5.
APA	P. Su,Y. Mei,W. C. Zheng,&H. G. Liu.(2013).A research on the g factors and defect model for the tetragonal Sm3+ center in KMgF3 crystal.Physica B-Condensed Matter,420,1-5.
MLA	P. Su,et al."A research on the g factors and defect model for the tetragonal Sm3+ center in KMgF3 crystal".Physica B-Condensed Matter 420(2013):1-5.