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Li2CO3助烧钴镍共掺BaTiO3基NTC热敏材料

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Abstract:

为了开发新型负温度系数(negativetemperaturecoefficient,NTC)热敏陶瓷材料,采用湿化学法制备钴镍共掺BaTiO3(BaTi0.9-xNi0.1CoxO3-δ,x=0.05,0.08,0.10,摩尔分数)粉体,并以质量分数为0.5%的Li2CO3为助烧剂,用传统烧结工艺制备相关陶瓷。用X射线衍射和扫描电子显微镜分析陶瓷的相组成与微观结构,用电阻-温度特性测试和交流阻抗谱分析研究BaTi0.9-xNi0.1CoxO3-δ陶瓷的电学性能。结果表明在1373K烧结可以获得致密性好的陶瓷样品;该材料体系具有六方系晶体结构并呈现明显的NTC效应;x=0.05、0.08、0.10样品的材料常数B分别为3590、3796、3354K。用电子跃迁机理分析材料的NTC导电特性。

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