油酸对化学共沉淀法制备La_0.7(Ca_0.53Sr_0.47)_0.3MnO_3多晶的电阻温度系数的影响  

Effect of Oleic-acid on TCR of La_0.7(Ca_0.53Sr_0.47)_0.3MnO_3 Polycrystals Prepared by Chemical Coprecipitation Method

作　　者：杨有利[1] 伍光风[1] 张鹏翔[2] 

机构地区：[1]重庆工学院材料科学与工程学院,重庆400050 [2]昆明理工大学光电子新材料研究所,云南昆明650051

出　　处：《热加工工艺》2008年第16期28-30,共3页Hot Working Technology

基　　金：重庆工学院科研启动基金资助项目(2005ZD22)

摘　　要：研究了化学共沉淀法制备La0.7(Ca0.53Sr0.47)0.3MnO3多晶过程中添加油酸作分散剂的工艺,用DTG/TA、XRD和R-T(电阻-温度)系统测试了所制样品的性能。结果表明:添加油酸,共沉淀法制备La0.7(Ca0.53Sr0.47)0.3MnO3多晶比不添加的烧结温度低,也比固相反应法低。油酸的用量为0.1～0.2 L/mol能明显提高La0.7(Ca0.53Sr0.47)0.3MnO3的电阻-温度转变点和电阻温度系数。The process of adding oleic acid as dispersant for La0.7（Ca0.53Sr0.47）0.3MnO3 polycrystalline prepared by chemical coprecipitation method was studied. The properties of samples were monitored by DTG/TA, R-T （resistance-temperature） system and XRD. The results show that sintering temperature of chemical coprecipitation method to synthesize La0.7（Ca0.53Sr0.47）0.3MnO3 polycrystalline adding oleic acid is lower than that of chemical coprecipitation method without oleic acid and solid state reaction＇s. Oleic acid （0.1-0.2 L/mol） as dispersant can also significantly improve resistance-temperature changing point （Tp） and temperature coefficient resistance （TCR） of La0.7（Ca0.53Sr0.47）0.3MnO3 polycrystalline.

关 键 词：油酸La0.7(Ca0.53Sr0.47)0.3MnO3 烧结温度 电阻温度系数 化学共沉淀法 

分 类 号：TG174[金属学及工艺—金属表面处理]