稀土氧化物La_(1-x)M_xNiO_3(M=Ca,Sr,Mg)电输运性能研究  

Study on Electrical Transport Property of Rare Earth Oxide La_(1-x)M_xNiO_3(M=Ca,Sr,Mg)

作　　者：赵倩[1] 丁铁柱[1] 朱志强[1] 孔伟 赵芯舫 

机构地区：[1]内蒙古大学理工学院物理系,内蒙古呼和浩特010021

出　　处：《中国稀土学报》2005年第S2期66-69,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(10464001);教育部科学技术研究重点项目(教技司02033);内蒙古教育厅重大项目(NJ03119)

摘　　要：用固相反应法合成了固体氧化物燃料电池阴极材料La1-xMxNiO3(M=Ca,Sr,Mg)。分析了界面产物的物相结构,测试了界面产物在不同温度下的直流电导率和不同温度不同频率下的交流电导率,给出了不同掺杂阴极样品的载流子的活化能,研究了界面产物对电输运性能的影响。结果表明,阴极样品LCNO-64活化能最小,电导率最大,载流子呈现P型导电特性,电输运性能符合小极化子导电机制,电导率贡献部分主要是晶界。The cathode materials La_(1-x)M_xNiO_3(M=Ca,Sr,Mg) for SOFC were obtained by solid state-reaction method.The phase structures of the interfacial product were analysed,the DC conductivity of the interfacial product was measured at different temperatures and their AC conductivity was done at different temperatures and different frequency.The activation energies of the carrier for cathode samples differently mingled were given,and the effect of interfacial product on electrical transport property was researched.The results indicate that the activity energy of the cathode sample LCNO-64 is the smallest,its conductivity is the biggest,the carrier takes on p-type conduction property.The electrical transport property is small polaron conduction mechanism,and the grain boundary mainly contributes to conductivity.

关 键 词：稀土氧化物 界面产物 直流电导率 交流电导率 

分 类 号：O614.33[理学—无机化学]