YBa_(1-x)Ca_xCo_2O_(5+δ)(x=0,0.1,0.15,0.2,0.25,0.3)体系的制备和物性研究  

The preparation and physical properties research of YBa_(1-x)Ca_xCo_2O_(5+δ)(x=0,0.1,0.15,0.2,0.25,0.3)

作　　者：曲丽娜[1] 刘毅[2] 莫润伟[1] 

机构地区：[1]贵州大学化学工程学院,贵州贵阳550003 [2]贵州大学理学院,贵州贵阳550003

出　　处：《贵州化工》2009年第2期4-7,共4页Guizhou Chemical Industry

基　　金：贵州大学博士人才引进基金(2006)

摘　　要：用溶胶凝胶法制备了钙钛矿钴氧化物YBa1-xCaxCo2O5+δ(x=0,0.1,0.15,0.2,0.25,0.3),系统研究了材料的热膨胀性能和电输运性质。结果表明,热膨胀系数随着Ca的掺杂量x的增加而减小,x=0.30掺杂样品在400℃-800℃温区内具有最小的平均热膨胀系数约为12.34×10-6K-1;掺杂样品在中低温下的电输运机制符合小极化子模型,x=0.30掺杂样品也具有较高的电导率约为126Scm-1,在800℃时的热膨胀系数与固体电解质YSZ最相近。The electrical properties and the thermal expansion of perovskite Cobalt Oxide YBa1-xCaxCo2Oδ5＋6（X=0,0.1,0.15,0.2,0.25,0.3） that was prepared by Sol- gel Method have been investigated. The results showed that,the thermai expansion coefficient decrease with the Ca doping content increasing. In the temperature of 400℃ - 800℃, the x = 0.3 samples has the smallest liner thermal expansion coefficient, it is about 12.34 × 10^-6K^-1. The electrical transport is found to obey the small polaron hopping mechanism. The x = 0.3 sample has the higher conductivity in the samples was observed. And in the temperature of 800℃ ,the thermal expansion coefficient of x =0.3 samples is similar to YSZ.

关 键 词：钙钛矿钴氧化物 溶胶凝胶法 热膨胀 电导率 

分 类 号：TQ134.1[化学工程—无机化工]