摘要
报道了在传统 Ba Ti O3基 PTCR陶瓷基料中间时加入一定配比的 Pb3O4 和 Ba CO3所产生的低阻现象。当 x=2 .5和 Pb/Ba=1.3时 ,陶瓷在 114 0°C保温 6 0 m in条件下获得了高性能的 PTCR瓷体 ,其室温电阻率与升阻比分别为 8Ω· cm和 4× 10 4 。结果表明 ,Pb3O4 和 Ba CO3的添加不仅能显著降低瓷体的室温电阻率 ,且还可以大幅度降低陶瓷的烧结温度。通过 XRD衍射谱分析并未在低阻瓷体中发现 Ba Pb O3相。根据所研究材料系统的一系列固态化学反应与缺陷反应提出了氧空位模型 ,并很好地解释了低阻化现象。
An unexpected lowing resistivity effect of adding lead oxide into PTCR ceramic composition accompanied with BaCO 3 is reported.At x =2 5 and Pb/Ba=1 3,the pellets can be optimized with a sintering temperature at 1 140 °C for 60 min.As a result,a lower resistivity(8 Ω·cm)and good magnitude(4×10 4)PTC ceramics was obtained.The PTCR ceramics' electric properties are largely impacted by the and Pb/Ba ratio,which are discussed in detail in the paper.XRD analysis is employed to the pellet but is failed to identify the BaPbO 3 phase.At last,a novel oxygen vacancy model is developed to explain this lowing resistivity phenomenon and perfectly consistent with the experiment results.
出处
《压电与声光》
CSCD
北大核心
2002年第4期271-274,302,共5页
Piezoelectrics & Acoustooptics
