| Cu/Mo共掺K_(0.5)Bi_(0.5)TiO_3陶瓷材料的PTC特性 |
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| 引用本文： | 张宇星,张鸿,李志成. Cu/Mo共掺K_(0.5)Bi_(0.5)TiO_3陶瓷材料的PTC特性[J]. 电子元件与材料, 2013, 32(6) |
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| 作者姓名： | 张宇星 张鸿 李志成 |
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| 作者单位： | 1. 中南大学材料科学与工程学院,湖南长沙,410083
2. 中南大学材料科学与工程学院,湖南长沙 410083;中南大学粉末冶金国家重点实验室,湖南长沙 410083 |
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| 基金项目： | 国家自然科学基金资助项目，粉末冶金国家重点实验室开放课题资助 |
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| 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。
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| 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 |
PTC characteristic of Cu/Mo co-doped K0.5Bi0.5TiO3 ceramics |
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| Abstract: | The K0.5Bi0.5(Ti1–2xCuxMox)O3(x=0.01,0.06) ceramics were prepared by a wet chemical method using polyvinyl 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 K0.5Bi0.5TiO3 ceramics possess a perovskite structure and show a good PTC characteristic.The Curie temperature,room-temperature resistance and resistance jump of the K0.5Bi0.5(Ti0.88Cu0.06Mo0.06)O3ceramic are 155 ℃,1 454 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. |
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| Keywords: | K0.5Bi0.5TiO3 Cu/Mo co-doping perovskite structure PTC characteristic Curie temperature grain boundary effect |
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