热敏陶瓷材料Mn_(2.25-x)Ni_(0.75)Co_xO_4微结构与电学性能研究  

Microstructure and Electrical Properties of Mn_(2.25-x)Ni_(0.75)Co_xO_4 Thermistor Ceramics

作　　者：彭昌文[1,2,3] 张惠敏[1,2] 常爱民[1,2] 黄霞[1,2,3] 姚金城[1,2,3] 

机构地区：[1]中国科学院新疆理化技术研究所,乌鲁木齐830011 [2]新疆电子信息材料与器件重点实验室,乌鲁木齐830011 [3]中国科学院研究生院,北京100049

出　　处：《无机材料学报》2011年第10期1037-1042,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50902148);中科院"西部之光"(RCPY200901)~~

摘　　要：采用氧化物固相法制备Mn2.25-xNi0.75CoxO4(0.8≤x≤1.2)系列NTC(negative temperature coefficient)热敏电阻粉体材料.利用激光粒度分析、XRD、SEM和电性能测试等手段,表征了煅烧材料的颗粒尺寸、陶瓷体的物相、形貌以及陶瓷材料的电学特性与Co含量的关系.结果表明:在1130～1230℃烧结温度范围内,该材料体系的B值和电阻率ρ25℃随Co含量的变化范围分别为3487～4455 K和1998～203617.cm,B值和电阻率随Co含量的增加先增大后减小.该材料系列电阻率和B值调整范围较大,是一种具有实际应用价值的NTC热敏电阻.A series of composite of the negative temperature coefficient（NTC） powders of Mn2.25-xNi0.75CoxO4（0.8≤x≤1.2） materials were prepared via solid-state method.The particle size of calcined powders,ceramics phase structure,morphology and electrical properties were characterized by laser particle size analyzer,XRD,SEM and electrical measurements,respectively.The results show that when the Mn2.25-xNi0.75CoxO4 ceramics sintered at 1130？1230℃,their characteristic parameters B25/50 value are found to be in the range of 3487K to 4455K and their electrical resistivi-ties ρ25℃ are 1998 Ω？cm to 203617 Ω？cm.The B25/50 value and ρ25℃ first increases and then decreases as the Co content increases.This means that electrical resistivity and B value of Mn2.25-xNi0.75CoxO4 ceramics could be adjusted to the de-sired values and this ternary system can be considered as the advanced semi-conducting materials for NTC thermistor applications.

关 键 词：NTC热敏陶瓷 尖晶石 电性能 

分 类 号：TQ174[化学工程—陶瓷工业]