(LaMn0.8Al0.2O3)1-x(Al2O3)x(0.05≤x≤0.2) NTC热敏陶瓷材料制备及电性能研究

无机材料学报, 2014, 29(1): 85-90. doi: 10.3724/SP.J.1077.2014.13171

(LaMn0.8Al0.2O3)1-x(Al2O3)x(0.05≤x≤0.2) NTC热敏陶瓷材料制备及电性能研究

赵丽君 ^1, , 张惠敏 ^2, , 常爱民 ^3, , 赵鹏君 ^4, , 张博 ^5, , 张丙寅 ^6,

1.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011;中国科学院大学,北京100049

2.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011

3.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011

4.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011;中国科学院大学,北京100049

5.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011;中国科学院大学,北京100049

6.中国科学院新疆理化技术研究所,乌鲁木齐830011;中国科学院特殊环境功能材料与器件重点实验室,乌鲁木齐830011;新疆电子信息材料与器件重点实验室,乌鲁木齐830011;中国科学院大学,北京100049

基金项目: 新疆维吾尔自治区科技计划项目(201116147) Science and Technology Program of Xinjiang Uygur Autonomous Region(201116147) "Western Light Foundation" Program of Chinese Academy of Sciences(RCPY200901) National Natural Science Foundation of China(50902148) 国家自然科学基金(50902148) 中科院"西部之光"(RCPY200901)

关键词： (LaMn0.8Al0.2O3)1-x(Al2O3)x , NTC热敏陶瓷 , 电性能

Preparation and Electrical Properties of (LaMn0.8Al0.2O3)1-x(Al2O3)x(0.05≤x≤0.2) NTC Ceramics

Keywords： (LaMn0.8Al0.2O3)1-x(Al2O3)x , NTC thermistor ceramics , electrical properties

采用氧化物固相法制备(LaMn0.8Al0.2O3)1-x(Al2O3)x (0.05≤x≤0.2)系列负温度系数(Negative Temperature Coefficient,NTC)热敏陶瓷材料.利用热重-差热(TG-DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能谱(EDS)、阻温特性以及老化性能测试等手段,确定了材料粉体最佳煅烧温度,表征了陶瓷体物相、形貌、元素含量、电学性能、稳定性与Al2O3含量的关系.结果表明:(LaMn0.8Al0.2O3)1-x(Al2O3)x(0.05≤x≤0.2)系列热敏陶瓷材料电阻率随着Al2O3含量增加显著增大,但材料常数B值增加平缓.当x=0.15时,该陶瓷材料呈现出低B(2816.44K)、高阻(11893.89 Ω·cm)的优良电学特性.热敏电阻经125℃老化500 h,阻值漂移(△R/R)均小于0.94％.

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