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Physical meaning of conductivity spectra for ZnO ceramics |
| Cheng Peng-Fei (成鹏飞)a, Li Sheng-Tao (李盛涛)b, Li Jian-Ying (李建英)b, Ding Can (丁璨)b, Yang Yan (杨雁)b |
a School of Science, Xi'an Polytechnic University, Xi'an 710048, China;
b State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China |
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Abstract With the help of broadband dielectric spectroscopy in a wide temperature and frequency range, conductivity spectra of ZnO polycrystalline ceramics are measured and direct-current-like (DC-like) conductivity and relaxation polarization conductivity are observed successively along the frequency axis. According to classical Debye theory and Cole-Cole equation, the physical meanings of the two conductivities are discussed. It is found that the DC-like conductivity corresponds to electron transportation over Schottky barrier at grainboundary. The relaxation polarization conductivity corresponds to electronic trap relaxation of intrinsic point defects (zinc interstitial and oxygen vacancy). When it is in the high frequency region, relaxation conductivity obeys the universal law with the index n equal to the index α in Cole-Cole equation as an indictor of disorder degree.
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Received: 11 January 2012
Revised: 03 March 2012
Accepted manuscript online:
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PACS:
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72.20.-i
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(Conductivity phenomena in semiconductors and insulators)
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73.30.+y
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(Surface double layers, Schottky barriers, and work functions)
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77.22.Gm
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(Dielectric loss and relaxation)
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77.55.hf
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(ZnO)
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| Fund: Project supported by the Scientific Research Plan of the Education Department of Shaanxi Province, China (Grant No. 12JK0434) and the Doctoral Scientific Research Foundation, China (Grant No. BS0814). |
Corresponding Authors:
Cheng Peng-Fei
E-mail: pfcheng@xpu.edu.cn
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Cite this article:
Cheng Peng-Fei (成鹏飞), Li Sheng-Tao (李盛涛), Li Jian-Ying (李建英), Ding Can (丁璨), Yang Yan (杨雁) Physical meaning of conductivity spectra for ZnO ceramics 2012 Chin. Phys. B 21 097201
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