کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5447561 | 1511500 | 2017 | 5 صفحه PDF | دانلود رایگان |

- The defect structures for Co2+ in ZnO microwires, thin films and bulks are theoretically investigated.
- Co2+ suffer the trigonal distortions away from the ligand triangles along the C3 axis due to Jahn-Teller effect.
- The contributions of the charge-transfer (CT) mechanism are taken into account.
- The defect structures and spectral properties of the three ZnO:Co2+ systems are discussed.
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⥠and hyperfine structure constants A// and Aâ¥) for trigonally distorted tetrahedral 3d7 clusters in a consistent way. The impurities Co2+ are found to suffer the displacements (â0.046, 0.044 and 0.045 à ) away from the ligand triangles along the C3 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.
Journal: Journal of Physics and Chemistry of Solids - Volume 106, July 2017, Pages 94-98