Study of EPR parameters and defect structure for two tetragonal impurity centers in MgO:Cr(3+) and MgO:Mn(4+) crystals
文献类型：期刊论文
| 作者 | X. X. Wu ; W. Fang ; W. L. Feng ; W. C. Zheng |
| 刊名 | Applied Magnetic Resonance
 |
| 出版日期 | 2009 |
| 卷号 | 35期号:4页码:503-510 |
| 关键词 | atomic screening constants tetravalent manganese scf functions ions mgo luminescence cr3+ transition spectra sites |
| ISSN号 | 0937-9347 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32436]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。