The investigation of the defect structures for Co2+ in ZnO microwires, thin films and bulks

被引：2

作者：

Ding, Chang-Chun ^{[1
]}

Wu, Shao-Yi ^{[1
]}

Wu, Li-Na ^{[1
]}

Xu, Yong-Qiang ^{[1
]}

Zhang, Li-Juan ^{[1
]}

机构：

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

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2017年 / 106卷

基金：

中国国家自然科学基金;

关键词：

Electron paramagnetic resonance (EPR); Defect structures; Co2+; ZnO; HYPERFINE-STRUCTURE CONSTANTS; ATOMIC SCREENING CONSTANTS; MAGNETIC-PROPERTIES; LOCAL-STRUCTURE; PARAMETERS; CENTERS;

D O I：

10.1016/j.jpcs.2017.03.005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The defect structures for Co2+ in ZnO microwires, thin films and bulks are theoretically investigated by analyzing the electron paramagnetic resonance (EPR) parameters (zero-field splitting D, g factors g(//) and g(perpendicular to) and hyperfine structure constants A(//) and Al-perpendicular to) for trigonally distorted tetrahedral 3d(7) clusters in a consistent way. The impurities Co2+ are found to suffer the displacements (approximate to 0.046, 0.044 and 0.045 angstrom) away from the ligand triangles along the C-3 axis in ZnO microwires, thin films and bulks, respectively, which considerably reduce the trigonal distortions of the Zn2+ sites in the hosts. Apart from the contributions from the conventional crystal field (CF) mechanism, those from the charge-transfer (CT) mechanism are important and should be included in the EPR analysis. The defect structures and spectral properties of the three ZnO:Co2+ systems are discussed.

引用

页码：94 / 98

页数：5

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