Effect of CeO2 on Electrical Properties of (Nb,Mn)-Doped TiO2 Varistor Ceramics
来源期刊：JOURNAL OF RARE EARTHS2005年第6期
论文作者：Zhang Nanfa Wang Maohua Hu Keao Zhao Binyuan
Key words：varistor; defect barrier model; TiO2; CeO2; electrical properties; rare earths;
Abstract: The electrical properties of TiO2-based varistor ceramics with different amount of CeO2 were investigated by measuring the properties of V-I, permittivity, density and boundary defect barriers. It is found that an optimal composition doped with 0.7% CeO2 exhibits the highest nonlinear coefficient of 10.5, the highest breakdown voltage of 12.77consistent with the highest and narrowest grain-boundary defect barriers. In order to illustrate the grain boundary barriers formation in TiO2-Nb2O5-MnCO3-CeO2 varistor, an grain-boundary defect barrier model was also introduced.
Zhang Nanfa1，Wang Maohua2，Hu Keao2，Zhao Binyuan2
(1.Changzhou Chuangjie Lightning Protection Co., Ltd, Changzhou 213016, China;
2.State Key Laboratory of MMCs, Shanghai Jiaotong University, Shanghai 200030, China)
Abstract:The electrical properties of TiO2-based varistor ceramics with different amount of CeO2 were investigated by measuring the properties of V-I, permittivity, density and boundary defect barriers. It is found that an optimal composition doped with 0.7% CeO2 exhibits the highest nonlinear coefficient of 10.5, the highest breakdown voltage of 12.77consistent with the highest and narrowest grain-boundary defect barriers. In order to illustrate the grain boundary barriers formation in TiO2-Nb2O5-MnCO3-CeO2 varistor, an grain-boundary defect barrier model was also introduced.
Key words:varistor; defect barrier model; TiO2; CeO2; electrical properties; rare earths;
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