La_1-_xCa_xCrO_3连接材料的研制  

Study on Rare Earth Interconnector of La1-xCaxCrO3

作　　者：刘晓梅[1,2,3] 吕喆[1,2,3] 刘江[1,2,3] 裴力[1,2,3] 何岚鹰[1,2,3] 苏文辉[1,2,3] 

机构地区：[1]吉林大学稀土固体物理研究室 [2]中国科学院国际材料物理中心 [3]中国高等科学技术中心凝聚态和辐射物理分中心

出　　处：《中国稀土学报》1999年第2期191-192,共2页Journal of the Chinese Society of Rare Earths

基　　金：国家计划委员会"八五"重点攻关项目;国家教委博士点基金

摘　　要：用溶胶凝胶法制备了单相性和均匀性好的Ｌａ１－ｘＣａｘＣｒＯ３（ｘ＝０～０５）系列材料。Ｘ射线衍射分析表明，当０≤ｘ≤０５时样品具有畸变的正交钙钛矿（ＧｄＦｅＯ３型）结构。ＸＰＳ测量确定了样品中存在Ｃｒ离子从Ｃｒ３＋变到Ｃｒ６＋的变价现象，随着ｘ的增加样品中Ｃｒ６＋的含量增加。s an interconnector of solid oxide fuel cell, La1-xCaxCrO3(x=005) were prepared by solgel method. The crystal structures at room temperature of La1-xCaxCrO3 all are of the othorhombic perovskite GdFeO3type. XPS analysis indicates that chrome ions are in mixed valence state. The introduction of Ca2+ into the lattice compensates by the oxidation from Cr3+ to Cr6+. With x increasing,the amount of Cr6+ becomes larger. The electrical conductivity increases with x, but when x>04 decreases. The conductivity of the samples within the temperature range is of ptype semiconducting, and can be described by a small polaron hopping mechanism.

关 键 词：稀土 镧钙铬 复合氧化物 连接材料 燃料电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]