La_(2/3)Ca_(1/3)MnO_3:Ag_(0.4)与La_(2/3)Ba_(1/3)MnO_3:Ag_(0.4)的制备及其性能研究  

Properties of La_(2/3)Ca_(1/3)MnO_3:Ag_(0.4) and La_(2/3)Ba_(1/3)MnO_3:Ag_(0.4) Composite Fabricated by Coprecipitation

作　　者：张少春[1] 刘翔[1] 陈清明[1] 晏益志[1] 曹明刚[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《热加工工艺》2012年第18期5-7,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(50974066);云南省自然科学基金资助项目(2009ZC013M)

摘　　要：采用化学共沉淀法合成制备了Ag掺杂摩尔百分比为0.4的La2/3Ca1/3MnO3∶Ag0.4(LCMO∶Ag0.4)、La2/3Ba1/3MnO3∶Ag0.4(LBMO∶Ag0.4)多晶复合材料,通过XRD和R-T分别对两种材料的结构和性能进行测试分析。实验结果表明:所得样品均为正交晶系钙钛矿结构;LCMO∶Ag0.4的金属-绝缘转变温度(Tp=280.2 K)比LBMO∶Ag0.4要高(Tp=256.8 K);LCMO∶Ag0.4样品的电阻值比LBMO∶Ag0.4要小两个数量级;LCMO∶Ag0.4的TCR最大值为28%,要远远高于LBMO∶Ag0.4的TCR最大值(0.5%)。La2/3Ca1/3MnO3∶Ag0.4（LCMO∶Ag0.4） and La2/3Ba1/3MnO3∶Ag0.4（LBMO∶Ag0.4） composite was prepared successfully by co-precipitation method.The microstructure and performance of La2/3Ca1/3MnO3 ∶Ag0.4 and La2/3Ba1/3MnO3 ∶Ag0.4 were investigated by X-ray diffraction and R-T measurement.The results show that,the metal-insulation transition temperature（Tp） of LCMO∶Ag0.4 at 280.2 K is higher than LBMO∶Ag0.4 sample at 256.8 K.The resistivity of LCMO∶Ag0.4 is lower 2 orders than LBMO∶Ag0.4 sample.The temperature coefficient of resistance（TCR） of LCMO∶Ag0.4 is 28%,which is higher than LBMO∶Ag0.4 sample as 0.5%.

关 键 词：La2/3Ca1/3MnO3∶Ag0.4 La2/3Ba1/3MnO3∶Ag0.4 化学共沉淀 电阻温度系数 

分 类 号：TB321[一般工业技术—材料科学与工程]