Physical meaning of conductivity spectra for ZnO ceramics

With the help of broadband dielectric spectroscopy in a wide temperature and frequency range, the conductivity spectra of ZnO polycrystalline ceramics are measured and the direct-current-like （DC-like） conductivity and relaxation polarization conductivity are observed successively along the frequenc...

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Published inChinese physics B Vol. 21; no. 9; pp. 445 - 448
Main Author 成鹏飞 李盛涛 李建英 丁璨 杨雁
Format Journal Article
LanguageEnglish
Published 01.09.2012
Subjects
Broadband
Ceramics
Electronics
Interstitials
Mathematical analysis
Polarization
Spectra
Zinc
Zinc oxide
光谱测量
导电性
氧化锌陶瓷
物理意义
电子陷阱
电导率
肖特基势垒
频率范围
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/21/9/097201

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Summary:With the help of broadband dielectric spectroscopy in a wide temperature and frequency range, the conductivity spectra of ZnO polycrystalline ceramics are measured and the direct-current-like （DC-like） conductivity and relaxation polarization conductivity are observed successively along the frequency axis. According to the 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 the Schottky barrier at the grainboundary. The relaxation polarization conductivity corresponds to electronic trap relaxation of intrinsic point defects （zinc interstitial and oxygen vacancy）. When in the high frequency region, the relaxation conductivity obeys the universal law with the index n equal to the index a in the Cole-Cole equation as an indictor of disorder degree.
Bibliography:ZnO ceramics, conductivity spectra, Schottky barrier, relaxation polarization
With the help of broadband dielectric spectroscopy in a wide temperature and frequency range, the conductivity spectra of ZnO polycrystalline ceramics are measured and the direct-current-like （DC-like） conductivity and relaxation polarization conductivity are observed successively along the frequency axis. According to the 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 the Schottky barrier at the grainboundary. The relaxation polarization conductivity corresponds to electronic trap relaxation of intrinsic point defects （zinc interstitial and oxygen vacancy）. When in the high frequency region, the relaxation conductivity obeys the universal law with the index n equal to the index a in the Cole-Cole equation as an indictor of disorder degree.
11-5639/O4
Cheng Peng-Fei, Li Sheng-Tao, Li Jian-Ying, Ding Can, and Yang Yan 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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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/9/097201