Abstract
采用固相反应法制备了施主掺杂浓度不同的Nb2O5（分别为0.1mol%、0.3mol%、0.5mol%、0.7mol%）掺杂（Ba,Bi,Na）TiO3基PTCR陶瓷.对其微观结构及电性能进行研究发现：随着Nb2O5掺杂浓度的增加,陶瓷晶粒尺寸先变大后变小,室温电阻率也随之先减小后增大,说明Nb2O5的掺杂量存在一个临界施主掺杂浓度.当Nb2O5施主掺杂量为临界施主掺杂浓度0.5mol%时,获得了居里温度Tc为183℃、室温电阻率ρ为1.06×10^3Ω.cm、升阻比ρmax/ρmin为1.0×10^4的高温无铅PTCR陶瓷.通过交流复阻抗谱分析,探讨了Nb2O5施主掺杂在该PTCR陶瓷中的作用机理.
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