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Influence on Electrical Properties and PTC Effect of BaTiO3 -based Ceramics with Donor- doping Trace Y2O3
Pages: 8-15
Year: Issue:  6
Journal: Guangdong Trace Elements Science

Keyword:  BaTiO 3 ceramicsPTC effectdonor-dopantthermistor ceramicssintering aids;
Abstract: In order to adapt to the market requirement of the PTC thermistor,whose was used for the overheat protection.The BaTiO3-based ceramics with doping an amount of Y2O3 were prepared by solid phase method.The room- temperature resistivity and the resistivity jump(ρmaxmax) of the BYT ceramics sintered at 1 340 1 360 ℃ for 0.5 1 h in air was investigated in this paper;moreover,the curve of "U" model for the dependence of the room — temperature resistivity of the BYT ceramics sintered at 1 350 ℃ for 1 h in air on the concentration of the donor dopant(0.1 ≤x≤0.3 mol%) were studied.According to Heywang- Jonker model,the PTC effect of the BYT specimens firsdy increased and then decreased with increasing of the donor dopant has been explained.Furthermore,the influence of the sintering aids on the electrical properties of the samples was also discussed.
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