A12O3掺杂对MnCONi系NTC热敏电阻材料性能的影响

摘要

采用传统固相法制备了Co1.5-xMn1.2Ni0.3AlxO4(x=0，0.02，0.04，0.06)NTC热敏电阻材料。借助XRD、SEM和几种电性能测试手段，研究了Al2O3掺杂对MnCoNi热敏电阻材料相结构及电性能的影响。结果表明：随着Al2O3掺杂量的增加，MnCoNi热敏电阻材料的晶体结构不变，晶粒减小，电阻率和材料常数B值由339.07 Ω·cm、3 489.07K分别增加到3 723.89 Ω·cm、3 956.80 K，电学稳定性由1.65％提高至0.17％。%Co1.5-xMn1.2Ni0.3AlxO4 (x= 0, 0.02, 0.04, 0.06) NTC thermistor materials were prepared by the traditional solid-state reaction method. The effects of Al2O3 doping on the microstructure and electric properties of prepared materials were studied through XRD, SEM and several instruments for electrical properties characterization. The results indicate that Al2O3 doping shows little effect on the crystal structure of prepared materials. However, with increasing Al2O3 content, the grain size of the MnCoNi thermistor materials decreases, while the resistivity, material constant B value and electrical stability increase from 339.07 Ω·cm, 3 489.07 K and 1.65% to 3 723.89 Ω·cm, 3 956.80 K and 0.17%, respectively.