La_(1-x)Ca_xMnO_3稀土氧化物多晶材料的制备与性能  

PREPARATION AND PROPERTIES OF La_(1-X)Ca_XMnO_3 POLYCRYSTAL TARGET BY CO-PRECIPITATION

作　　者：刘翔[1] 胡俊涛[1] 严磊[1] 段云彪[1] 储清梅[1] 冯炜光[1] 潘峰[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650051

出　　处：《陶瓷学报》2009年第1期29-33,共5页Journal of Ceramics

基　　金：云南省教育厅基金资助项目(编号:07C41144)

摘　　要：采用碳酸铵化学共沉淀法在1200℃保温24小时的条件下,制备了x组分为0.2、0.33和0.9的La1-xCaxMnO3多晶靶材,通过R-T和XRD测试分析,结果表明化学共沉淀法获得了阻温特性良好(TM-I为253K、TCR为3.2%)、物相较纯的各组分LCMO多晶材料。随着x组分的增加,Ca掺杂量越大,TCR越大、对应TP温度越低,LCMO的晶格常数abc线性减小、晶粒尺寸增大。In this paper, La1-xCaxMnO3 with x=0.2, 0.33 and 0.9 crystal targets have been fabricated by co-precipitation. R-T and x ray diffraction show that pure La1-xCaxMnO3 crystal targets have been obtained by co-precipitation at 1200℃ for 24 hours. TM-I and TCR are 253K and 3.2% respectively. With x doping increased, TCR is larger and TP is lower, and lattice constant of La1-xCaxMnO3 is linearly decreased.

关 键 词：稀土氧化物 La1-xCaxMnO3 共沉淀法 碳酸铵 

分 类 号：TQ174.75[化学工程—陶瓷工业]