The preparation and characterization of ZnO-Pr_6O_(11)-Co_3O_4-TiO_2 (ZPCT) based varistor materials with different doping levels of TiO_2 and Pr_6O_(11) were investigated. The results reveal that: (1) TiO_2 is an important additive, acting as an inhibitor of ZnO grain growth. The doping of appropriate amount of TiO_2 can significantly improve the nonlinear properties and decreases the leakage current of the varistors, achieving a relatively high nonlinear exponent and low leakage current with 1.0 mol% TiO_2 doped. (2) The oxide of Pr_6O_(11) microstructurally plays the role of inhibition in grain growth. The doping of appropriate amount of Pr_6O_(11 can improve the nonlinear property, and decrease the leakage currents of the varistors, acquiring the optimum results with 1.5 mol% Pr_6O_(11) doped.
ZnO varistorPr_6O_(11)TiO_2electrical properties
Hai Feng、Zhijian Peng、Chengbiao Wang、Zhiqiang Fu、Hezhuo Miao
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School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
NETL
NSTL
Trans Tech Publications Ltd
