流变相法制备NiMn2O4热敏陶瓷材料及电学性能研究  

Fabrication and electrical properties of NiMn_2O_4 thermistor ceramic materials by rheological phase method

作　　者：张奇男[1,2] 姚金城[2] 陈龙[2,3] 常爱民[2] 陈惠敏[1] 

机构地区：[1]昌吉学院物理系,新疆昌吉831100 [2]中国科学院特殊环境功能材料与器件重点实验室,新疆电子信息材料与器件重点实验室,中国科学院新疆理化技术研究所,乌鲁木齐830011 [3]中国科学院大学,北京100049

出　　处：《功能材料》2016年第8期8248-8252,共5页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA091102);中国科学院特殊环境功能材料与器件重点实验室开放课题基金资助项目(2013DP173196-2013-04);中国科学院西部之光基金资助项目(XBBS201314)

摘　　要：采用流变相法制备了NiMn2O4负温度系数热敏电阻材料,重点研究了不同煅烧温度和烧结温度对NiMn2O4热敏电阻材料微观形貌和电学性能的影响,并且借助XRD、SEM以及电学测试等手段对其进行了表征。研究结果表明,煅烧温度为850℃时,粉体主要由立方尖晶石相和少量的NiO相组成;当烧结温度为1 150℃时,陶瓷样品具有最低的室温电阻率、最高的材料常数B值以及最低的电阻漂移率（ΔR/R）,分别为2 679Ω·cm、3 878K和0.75%-0.86%。而且不同烧结温度下的陶瓷样品电导激活能都在0.33eV左右。因此,流变相法制备的NiMn2O4陶瓷材料具有良好的热稳定性以及热敏性能,满足市场发展的需要。NiMn2O4 negative temperature coeifficient（NTC）thermistor materials were prepared by the rheological phase method.The effect of calcination temperature and sintering temperature on the microstructure and electrical properties of NiMn2O4 ceramic materilas was systemically investigated and characterized by XRD,SEM,and electrical mearsurement.The results indicate that the NiMn_2O_4 powders are mainly composed of cubic spinel phase and a small amount of NiO phase at the calcination temperature of 850℃.At the sintering temperature of 1 150 ℃,the values of ceramic samples with the lowest resistivity at room temperature（ρ25）,the maximum value of the material constant B and the lowest resistivity drift rate（ΔR/R）,are 2 679Ω·cm,3 878 Kand 0.75%-0.86%,respectively.The activation energy of NiMn2O4 ceramic samples sintered at different temperatures is about 0.33 eV.Therefore,NiMn2O4 ceramic materials prepared by the rheological phase have well thermal stability and thermal performance and meet the demands of market development.

关 键 词：流变相 热敏电阻 电阻率 稳定性 

分 类 号：TQ129.2[化学工程—无机化工]