摘要
用溶胶凝胶法制备了单相性和均匀性好的Ｌａ１－ｘＣａｘＣｒＯ３（ｘ＝０～０５）系列材料。Ｘ射线衍射分析表明，当０≤ｘ≤０５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.
出处
《中国稀土学报》
CAS
CSCD
北大核心
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
关键词
稀土
镧钙铬
复合氧化物
连接材料
燃料电池
Rare earths, La1-xCaxCrO3, Hightemperature conductivity,
Interconnector
