中文摘要：

通过X线衍射（XRD）、扫描电子显微镜（SEM）和阻温特性测试仪,研究了不同NiO、Ni_2O_3掺杂量对BaNi~Ⅱ_xBi_（1-x）O_3和BaNi~Ⅱ_（x/3）Ni~Ⅲ_（2x/3）Bi_（1-x）O_3（摩尔比x=0.02~0.08）热敏陶瓷的物相、显微结构及电性能的影响。结果表明,BaNi~Ⅱ_xBi_（1-x）O_3与BaNi~Ⅱ_（x/3）Ni~Ⅲ_（2x/3）Bi_（1-x）O_3热敏陶瓷的室温电阻率ρ25及热敏常数B25~85值均随着NiO/Ni_2O_3掺杂量的增加呈现先减小后变大的趋势;试样BaNi~Ⅱ_（0.04）Bi_（0.96）O_3取得了良好的热敏性能,ρ25=2 743Ω·cm,B25~85=3 239K;BaNi~Ⅱ_（0.02）Ni~Ⅲ_（0.04）Bi_（0.94）O_3陶瓷的ρ25和B25~85的最优值分别为65Ω·cm和2 673K。

英文摘要：

The effects of NiO/Ni_2O_3 doping amount on the phase structure,microstructure and electrical properties of BaNi~Ⅱ_xBi_（1-x）O_3 and BaNi~Ⅱ_（x/3）Ni~Ⅲ_（2 x/3）Bi_（1-x）O_3（x=0.02~0.08）based thermosensitive ceramics were investigated by X-ray diffraction（XRD）,scanning electron microscope（SEM）andρ-t characteristic tester.The results showed that with the increase of the NiO/Ni_2O_3 doping amount,the room-temperature resistivityρ25 and the thermal constant value B25~85 of the ceramic sample first decreased,and then increased again.The excellent thermosensitive properties were achieved for BaNi~Ⅱ_（0.04）Bi_（0.96）O_3 ceramic withρ25=2 743Ω·cm and B25~85=3 239 K.For BaNi~Ⅱ_（0.02） Ni~Ⅲ_（0.04）Bi_（0.94）O_3 ceramic,the optimal values ofρ25 and B25~85 were 65Ω·cm and 2 673 K,respectively.