【摘要】 研究了用Fe₂O₃和Cr₂O₃粉末制备Cr_0.8 Fe_1.2O₃工艺及Cr_0.8Fe_1.2O₃负温度系数的热敏材料及其性能。通过XRD,SEM和测量温度电阻性能考察了Cr_0.8Fe_1.2O₃的相组成,微观组织和温度电阻性能。结果表明:在1300℃按一定化学配比的Fe₂O₃和Cr₂O₃粉末烧结制备出的具有单斜结构的Cr_0.8Fe_1.2O₃。Cr_0.8Fe_1.2O₃在使用的温度范围内（150～450℃）是一种稳定的材料。这种热敏材料在很宽的温度范围内具有负温度系数的特征。更多还原

【Abstract】 The thermistor Cr_0.8Fe_1.2O₃ of negative temperature coefficient（NTC）was fabricated from Fe₂O₃ and Cr₂O₃.The phase, microstructure and electrical properties of it were studied by XRD,SEM and temperature resistance.The sample obtained at 1300℃had the single rhombohedral phase Cr_0.8Fe_1.2O₃ which was stable up to 450℃.The material showed negative temperature coefficient over wide range of temperatures（150⁴50℃）.The thermistor constant value B was 3606 K.and the activation energy was 0.317 eV更多还原