摘要
采用氧化物固相法制备(LaMn1-xTixO3)0.67(NiMn2O4)0.33系列NTC(Negative temperature coefficient)复合热敏电阻材料。利用TG/DSC、激光粒度分析、XRD、SEM、阻-温特性和老化性能测试等手段,确定了粉体煅烧温度,表征了粉体的颗粒尺寸、陶瓷体的物相、形貌及其电学特性、稳定性等与Ti掺杂量的关系。结果表明:在1 200~1 300℃烧结温度范围内,(LaMn1-xTixO3)0.67(NiMn2O4)0.33复合体系的电阻率ρ25℃随Ti含量的增加而显著增加;电阻率ρ25℃和B值变化范围分别为4.4~53 179Ω.cm、1 357~3 998 K。125℃下老化1 000 h阻值变化率ΔR/R0均小于0.51%。该复合体系电阻率、B值调整范围较大,稳定性好,是一种具有实际应用价值的NTC热敏电阻材料。
A series of NTC （Negative temperature coefficient） composite material of （LaMnl-xTixO3）0.67（NiMn2O4）0.33 was prepared by solid-state method. The calcined temperature, particle size, ceramics phase structure, morphology, R-T property and electrical stability were characterized by TG/DSC, Laser particle size analyzer, XRD, SEM, resistance-temperature measurement and aging test, respectively. The results show that in the range of 1 200-1 300 ℃ sintered temperature, the electrical resistivity p25℃ of the composite ceramics increased significantly with Ti content increased. The pzs^c are found to be in the range of 4.4-53 179 Ω.cm and the B25/50 values are 1357~3 998 K. The resistance drift rate △R/R0 of the composite ceramics after 1 000 h aging test at 125℃ was less than 0.51%. The electrical resistivity and B value of （LaMnt_xTixO3）0.67（NiMn204）o33 could be adjusted to desired values. The composite system has high stability. Therefore, the （LaMn1-xTixO3）0.67（NiMn2O4）0.33 could be used for NTC thermistor as advanced semi-conducting materials.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2013年第4期760-766,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.50902148)
中科院"西部之光"(No.RCPY200901)
新疆维吾尔自治区科技计划(No.201116147)资助项目
作者简介
通讯联系人。E-mail：changam@ms．xjb．ac．cn；会员登记号：S02P830003M。
