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为了开发新型负温度系数(negative temperature coefficient,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1 373 K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3 590、3 796、3 354 K。用电子跃迁机理分析材料的NTC导电特性。
In order to develop a novel negative temperature coefficient (NTC) thermosensitive ceramic material, BaTiO3 (BaTi0.9-xNi0.1CoxO3-δ, x = 0.05,0.08,0.10, mole fraction) Powder, and mass fraction of 0.5% Li2CO3 as sintering aid, the use of traditional sintering process to prepare the relevant ceramics. The phase composition and microstructure of the ceramics were analyzed by X-ray diffraction and scanning electron microscopy. The electrical properties of BaTi0.9-xNi0.1CoxO3-δ ceramics were investigated by resistance-temperature characteristics and AC impedance spectroscopy. The results show that the compact ceramic sample can be obtained by sintering at 1 373 K. The material system has hexagonal crystal structure and exhibits obvious NTC effect. The material constants B of samples with x = 0.05, 0.08 and 0.10 are respectively 3 590 and 3 796,3 354 K. Analysis of NTC Conductivity of Materials by Electronic Transition Mechanism.