Theoretical investigations of the EPR parameters for PbTiO3:Cr3+ bulks and nanopowders

被引：11

作者：

Wu, SY ^{[1
]}

Gao, XY

Dong, HN

机构：

[1] Univ Elect Sci & Technol China, Dept Appl Phys, Chengdu 610054, Peoples R China

[2] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China

[3] Chongqing Univ Post & Telecommun, Inst Appl Phys, Chongqing 400065, Peoples R China

[4] Chongqing Univ Post & Telecommun, Coll Elect Engn, Chongqing 400065, Peoples R China

来源：

MATERIALS LETTERS | 2006年 / 60卷 / 11期

关键词：

defects; electron paramagnetic resonance; crystal fields; Cr3+; PbTiO3;

D O I：

10.1016/j.matlet.2005.11.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The EPR parameters zero-field splitting D, g factors g(ll) and g(-L) for the four centers (C1-C4) in PbTiO3:Cr3+ bulks and nanopowders are theoretically investigated from the perturbation formulas of the EPR parameters for a 3d(3) ion in tetragonally distorted octahedra. Based on the studies, the impurity displacements Delta Z' away from the center of the octahedron are obtained by analyzing the experimental EPR data. The results of the calculated D values in this work are compared with those based oil the superposition model analyses in the previous works. The sign and magnitude of D and the impurity displacements in these centers are discussed. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1319 / 1322

页数：4