固体氧化物燃料电池Ln_(0.5)Sr_(0.5)CoO_3薄膜阴极材料电学性能研究  

Study on Electrical Properties of Ln_(0.5)Sr_(0.5)CoO_3 thin Films for SOFC Cathode Materials

作　　者：姜涛[1] 丁铁柱[1] 潮洛蒙[1] 范文亮[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《稀土》2009年第5期6-9,共4页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(10464001)

摘　　要：采用离子束溅射法在YSZ(110)衬底上制备Ln0.5Sr0.5CoO3(Ln=La,Pr)钙钛矿多晶薄膜,研究了载流子浓度、迁移率与温度的关系,分析了A位置稀土离子半径rA3+对电导率的影响。结果表明,在375K^667K温度范围内,La0.5Sr0.5CoO3薄膜的载流子浓度由4.76×1027/m3升高到9.43×1027/m3,迁移率由0.21cm2/Vs升高到0.218cm2/Vs;Pr0.5Sr0.5CoO3薄膜的载流子浓度由0.58×1027/m3升高到7.9×1027/m3,迁移率由0.0853cm2/Vs升高到0.172cm2/Vs。Ln0.5Sr0.5CoO3薄膜的霍尔系数激活能EH与电导激活能Eα的比值近似为2/3,符合Emin和Holstein的小极化子绝热区域导电理论。Ln0.5Sr0.5CoO3（ Ln = La, Pr）perovsldte polycrystalline thin films were deposited on a YSZ（110） substrate by ion beam sputtering. The effects of temperature on carder concentration, mobility and conducting were studied. The effect of rare earth cation radius at the A site of the perovskite structure on the conductivity was investigated. The results indicated that the carrier concentration increases from 4.76 ×10^27/m3 to 9.43×10^27/m3 and mobility increases from 0.21cm2/Vs to 0.218cm2/Vs for the La0.5Sr0.5CoO3 thin films while the carrier concentration increases from 0.58 ×10^27/m3 to 7.9 ×10^27/m3 and the mobility increases from 0.0853cm2/ Vs to 0.172cm2/Vs for the Pr0.5Sr0.5CoO3 thin films with temperature from 375K to 667K. Moreover, the Hall coefficient activation energy En of the Lno.sSro.sCoO3 thin films are nearly 2/3 of the conductivity activation energy E,,whieh agrees with the small - polaron conduction model in the adiabatic region proposed by Emin and Holstein.

关 键 词：Ln0.5Sr0.5CoO3薄膜 固体氧化物燃料电池 载流子浓度 迁移率 

分 类 号：TM911[电气工程—电力电子与电力传动] O614.33[理学—无机化学]