Journal of Inorganic Materials >
Influences of Bi2O3-B2O3 Glass Doping on Properties of ZnO-Bi2O3-TiO2-based Varistors
Received date: 2009-12-10
Revised date: 2010-02-05
Online published: 2010-07-19
The influences of Bi2O3-B2O3 glass additives on the microstructure and nonlinear electrical properties of ZnO-Bi2O3-TiO2-based varistor were investigated. SEM images show that low melting Bi2O3-B2O3 glass can help to increase ZnO grain size and refine microstructure with uniform grain size distribution at 900℃ through liquid phase sintering mechanism, whereas the grain size decreases with increasing ZnO-B2O3 glass addition resulting from non-melting ZnO-B2O3 glass pining the ZnO grain boundaries. The varistor ceramics with 2wt% Bi2O3-B2O3 glass addition own best nonlinear electrical properties with voltage gradient E1mA=124.9V/mm, nonlinear coefficient α=46.2, leakage current density JL=0.2μA/cm2. For Bi2O3-B2O3 glass doped varistor, kinetic exponent nB and apparent activation energy QB are only 2.15 and 146.2kJ/mol which are much lower than that of ZnO-B2O3 glass doped varistor. The results reveal that Bi2O3-B2O3 glass doping is more effective in improving the microstructure and electrical properties of ZnO-Bi2O3-TiO2-based varistor than ZnO-B2O3 glass doping.
WAN Shuai, LV Wen-Zhong . Influences of Bi2O3-B2O3 Glass Doping on Properties of ZnO-Bi2O3-TiO2-based Varistors[J]. Journal of Inorganic Materials, 2010 , 25(8) : 811 -814 . DOI: 10.3724/SP.J.1077.2010.00811
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