Cu/Mo共掺K_(0.5)Bi_(0.5)TiO_3陶瓷材料的PTC特性  

PTC characteristic of Cu/Mo co-doped K_(0.5)Bi_(0.5)TiO_3 ceramics

作　　者：张宇星[1] 张鸿[1] 李志成[1,2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《电子元件与材料》2013年第6期34-37,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.51172287);粉末冶金国家重点实验室开放课题资助

摘　　要：采用以聚乙烯醇为聚合剂的湿化学方法合成制备了K0.5Bi0.5(Ti1–2xCuxMox)O3(x=0.01,0.06)陶瓷材料。利用X射线衍射、扫描电子显微镜、电阻–温度测试和交流阻抗谱分析对材料的微观组织和热敏特性进行了表征。结果表明:Cu/Mo共掺的K0.5Bi0.5TiO3陶瓷具有钙钛矿结构,并呈现明显的PTC效应;K0.5Bi0.5(Ti0.88Cu0.06Mo0.06)O3陶瓷的居里点为155℃,室温电阻为1 454,升阻比为2.62个数量级。材料的PTC效应主要来源于晶界电阻效应,遵循Heywang模型。The K0.5 Bi0.5（Ti1_2xCuxMox）O3 （x=0.01, 0.06） ceramics were prepared by a wet chemical method using polyvinyt alcohol as the polymerizing agent. The phase component and microstructure of the prepared materials were investigated by X-ray diffraction and scanning electron microscope. The electrical properties were studied by resistance-temperature measurement system and AC impedance analysis. The results reveal that Cu/Mo co-doped K0.5 Bi0.5 TiO3 ceramics possess a perovskite structure and show a good PTC characteristic. The Curie temperature, room-temperature resistance and resistance jump of the K0.5 Bi0.5（Ti0.88 Cu0.06 Mo0.06）O3 ceramic are 155 ℃, 1 454 Ω and 2.62 orders of magnitude, respectively. The PTC effect of the prepared ceramic is mainly derived from the grain-boundary effect and is consistent with the Heywang model.

关 键 词：K0.5Bi0.5TiO3 Cu/Mo共掺 钙钛矿结构 PTC特性 居里温度 晶界效应 

分 类 号：TN373[电子电信—物理电子学]