YBa_3Fe_3O_(10)混合导体的缺陷及电性能研究  

Study on the Defect and Electronic Properties of YBa_3Fe_3O_(10) Mixed Conductor

作　　者：张国光[1] 张静[1] 李琴[1] 崔明杰[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《材料导报》2009年第6期63-65,共3页Materials Reports

基　　金：国家自然科学基金资助项目(50672100);江西省教育厅资助项目(赣技字[2006]55;[2006]313)

摘　　要：采用柠檬酸盐法制备了纯相YBa3Fe3O10材料。采用碘滴定方法得到了YBa3Fe3O10在不同温度下的氧非化学计量值δ,δ值随温度的升高而增加。Seebeck系数测量和电导率测量结果表明,YBa3Fe3O10的载流子类型为p型,根据缺陷反应方程Oo×+2FeF.e4+=2FeF×e3++Vo..+1/2O2↑,解释了电导率随温度和氧分压变化的规律。800℃时YBa3Fe3O10的氧化学扩散系数达3.0×10-5cm2/s量级。Mixed oxide ion conductor YBa3Fe3O10 is synthesised by citric acid method. Iodine titration results show that the oxygen nonstoichiometry 8 of YBa3Fe3O10 increases with the increase of temperature. Seebeck coefficient and conductivity measurement results indicate YBa3Fe3O10 is a p-type conductor. The varation of conductivity of YBaa Fe3Ol0 with temperature and oxygen partial pressure is explained in terms of defect reaction Oo^x2FeFeO^4＋=2FeFe4＋=2FeFe^x3＋＋Vo＋1/2O2↑. At 800℃, oxygen chemical diffusion coefficient of YBaaFeaO10 is 3. 0× 10^-5cm2/s.

关 键 词：SEEBECK系数 氧非化学计量 电导率 氧化学扩散系数 

分 类 号：TQ174.758[化学工程—陶瓷工业] O484[化学工程—硅酸盐工业]