La_(2/3)Ba_(1/3)MnO_3∶Ag_x多晶靶材制备及其性能  

Preparation and properties of La_(2/3)Ba_(1/3)MnO_3∶Ag_x ceramic targets

作　　者：张少春[1] 刘翔[1] 张辉[1] 陈清明[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650051

出　　处：《材料热处理学报》2013年第2期1-4,共4页Transactions of Materials and Heat Treatment

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：采用化学共沉淀法制备了不同Ag掺杂量的La2/3Ba1/3MnO3∶Agx(x为摩尔分数,x=0.00、0.02、0.08、0.10、0.20)多晶靶材,通过XRD、SEM和R-T对La2/3Ba1/3MnO3∶Agx靶材的结构和性能进行测试分析,实验结果表明:所得样品为正交晶系钙钛矿结构;掺Ag(x=0.02、0.08、0.10、0.20)样品比未掺Ag样品的金属-绝缘转变温度Tp值低;随着烧结温度和Ag掺杂量的升高,金属-绝缘转变温度Tp随之增加;随着Ag掺杂量增加,电阻率归一化值先增大后减小。La、Ba、Mn元素的摩尔分数与理论设计的数值基本相同,O元素在烧结过程中缺失较严重,Ag元素的摩尔分数也较低,这与Ag在高温烧结时的挥发有关。La2/3 Ba1/3 MnO3： Agx ceramic targets were prepared by co-precipitation method. Structure and performance of La2/3 Ba1/3 MnO3： Agx （ LBMO： Agx ） were investigated by means of X-ray diffraction, scanning electron microscopy and R-T measurement. Results show that the samples are orthogonal structure of perovskite. Metal-insulate transition temperature （Tp） of the samples doped with Ag （x = O. 02, O. 08,0. 10） are lower than that of the pure LBMO sample. The metal-insulate transition temperature （Tp） increases with the increase of the sintering temperature and the Ag doping. Normal resistivity of La2/3 Bal/3 MnO3 ： Agx decreases with the increase of the Ag doping. Mole preeent of La, Ba, Mn in the samples are approximately equal to that of design vaules, however, that of the oxygen and silver atoms in the samples are lacking than that of the design values. It probably results from the volatilization of the oxygen and silver atoms at high sintering temperature.

关 键 词：La(2 3)Ba(1 3)MnO3∶Agx 化学共沉淀 多晶靶材 

分 类 号：TG132.2[一般工业技术—材料科学与工程] TM27[金属学及工艺—合金]