Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals

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	Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals
	X. X. Wu; W. Fang; W. L. Feng; W. C. Zheng
	2009
发表期刊	Applied Magnetic Resonance
ISSN	0937-9347
卷号	35 期号:4 页码:503-510
摘要	The electron paramagnetic resonance (EPR) parameters (g-factors g (aEuro-), g (aSyen) and zero-field splitting D) of two tetragonal 3d(3) impurity centers M(3d)-V(Mg) and M(3d)-Li(+) (where M(3d) = Cr(3+) or Mn(4+), V(Mg) is the Mg(2+) vacancy) in M(3d)-doped MgO crystals are calculated from the high-order perturbation formulas including both the crystal-field (CF) and the charge-transfer (CT) mechanisms for 3d(3) ions in the tetragonal symmetry. The calculated results are in reasonable agreement with the experimental values. From the calculations, it can be found that the relative importance of the CT mechanism for EPR parameters increases with increasing valence state of the 3d(3) ion. So, for the high-valence 3d (n) ions in crystals, a reasonable explanation of EPR parameters should take into account both CF and CT mechanisms. The defect structures (characterized by the displacement Delta R of O(2-) in the intervening M(3d) and V(Mg) or Li(+) at the Mg(2+) site) for these tetragonal impurity centers are obtained from the calculations. The results are consistent with the expectations based on the electrostatic interactions.
部门归属	[wu, x-x] civil aviat flight univ china, dept phys, guanghan 618307, peoples r china. [fang, w.; feng, w-l; zheng, w-c] sichuan univ, dept mat sci, chengdu 610064, peoples r china. [feng, w-l] chongqing inst technol, dept appl phys, chongqing, peoples r china. [zheng, w-c] chinese acad sci, int ctr mat phys, shenyang, peoples r china.;wu, xx (reprint author), civil aviat flight univ china, dept phys, guanghan 618307, peoples r china;wxxdd@163.com
关键词	Atomic Screening Constants Tetravalent Manganese Scf Functions Ions Mgo Luminescence Cr3++ Transition Spectra Sites
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32436
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. X. Wu,W. Fang,W. L. Feng,et al. Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals[J]. Applied Magnetic Resonance,2009,35(4):503-510.
APA	X. X. Wu,W. Fang,W. L. Feng,&W. C. Zheng.(2009).Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals.Applied Magnetic Resonance,35(4),503-510.
MLA	X. X. Wu,et al."Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals".Applied Magnetic Resonance 35.4(2009):503-510.