【摘要】 采用Pechini法制备La掺杂的Fe-Co-Mn-Ni系尖晶石型负温度系数(negative temperature co-efficient,NTC)热敏陶瓷,使用X射线衍射仪和扫描电镜表征了复合陶瓷的相组成和微观结构,测量了其电学性能和老化。结果表明,制备的NTC热敏陶瓷20K时电阻值在90～120kΩ之间;在20～45K温度范围内电阻灵敏度在0.5～45kΩ/K之间,测试电流在2～15μA内变化时引起的温度测量误差<0.1K,热敏电阻常数B20K/40K值在180～210K之间,制备的NTC热敏电阻性能稳定。更多还原

【Abstract】 Negative temperature coefficient(NTC) ceramic with spinel structure of Fe-Co-Mn-Ni composition, doped by the ion La3+, was prepared by the Pechini method. The phase composition and microstructure of materials were characterized by means of X-ray diffraction and scanning electron microscope, and the electric properties and aging were also measured. The experimental results show that thermo-sensitive ceramics obtained at 1100℃ was steady, the prepared sensors have resistance in the range from 90 to 120kΩ at 20K, the sensitivity ranged from 0. 5 to 45kΩ/K in the temperature range from 45 to 20K. The current-induced temperature error is less than 0. 1 at 20K. The values of thermistor constant, B20K/40K range from 180 to 210K.更多还原