采用X射线衍射、扫描电子显微镜和ρ-t特性测试仪,研究了不同Co2O3/Co3O4掺杂量对BaCoⅢxBi1-xO3(x=0.02, 0.04, 0.06, 0.08) 和BaCoⅡx/3CoⅢ2x/3Bi1-xO3(x=0.02, 0.04, 0.06, 0.08)热敏陶瓷的物相、显微结构及电性能的影响.结果表明:BaCoⅢxBi1-xO3和BaCoⅡx/3CoⅢ2x/3Bi1-xO3的基本相均为钙钛矿结构的连续固溶体;Co2O3/Co3O4的含量能直接影响电学性能.试样的室温电阻率ρ25和B25~85值均随着Co2O3/Co3O4的增加呈现先下降后回升的趋势;BaCoⅢ0.06Bi0.94O3陶瓷展现出较好的NTC特性,其ρ25和B25~85值分别为12.19 Ω·cm和717 K;BaCoⅡ0.02CoⅢ0.04Bi0.94O3也获得了良好的NTC特性,其ρ25和B25~85值分别为12.32 Ω·cm和1069 K.
The effects of Co2O3/Co3O4-doped amount on the phase structure, microstructure and electrical properties of BaCoⅢxBi1-xO3 (x=0.02,0.04,0.06,0.08) and BaCoⅡx/3CoⅢ2x/3Bi1-xO3 (x=0.02,0.04,0.06,0.08) based thermistor ceramics were investigated by X-ray diffraction, scanning electron microscope and ρ-t characteristic tester.The results show that the matrix phase is a continuous solid solution with pervoskite structure.The content of Co2O3/ Co3O4 has dramatically impact on the electrical properties.With the increase of the Co2O3/ Co3O4-doped amount, both ρ25 and B25~85values of the ceramic sample reduce initially and then increased.The BaCoⅢ0.06Bi0.94O3 ceramics show excellent NTC properties of ρ25=12.19 Ω·cm, B25~85=717 K.A good NTC properties of ρ25=12.32 Ω·cm and B25~85=1069 K was also obtained for BaCoⅡ0.02CoⅢ0.04Bi0.94O3.
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