【作者】 仇立干； 马桂林； 于玠； 闻荻江；

【Author】 LiganQiu, Guilin Ma , JieYu, DijiangWenSchool of Chemistry and Chemical Engineering, School of Material Engineering,Suzhou University, Suzhou 215006, China

【机构】 苏州大学化学化工学院； 苏州大学材料工程学院；

【摘要】 制备了BaxCe0.8Tb0.2O3- (x=1.03,1,0.98)系列固体电解质,用X-射线衍射法对其结构进行了表征,用交流阻抗谱方法和气体浓差电池方法测定了样品在500-1000℃温度范围、不同气氛中的导电特性,讨论了非化学计量组成对样品导电性能的影响。结果表明,这三个样品均为钙钛矿型斜方晶结构。样品在500-1000℃下氮气中,以电子导电为主;在氧气及空气中,以电子空穴导电为主;在氢气中以质子导电为主,其电导率比不含氢气气氛(O2,air,N2)中的电导率约高两个数量级。同一样品在潮湿气氛中的电导率高于相应的干燥气氛中的电导率;非化学计量组成(x=1.03和0.98)样品的电导率高于化学计量组成(x=1)样品的电导率。更多还原

【Abstract】 BaxCe0.8Tb0.2O3 (x = 0.98 to 1.03) solid electrolytes were synthesized and characterized using X-ray diffraction (XRD). By using AC impedance spectroscopy and gas concentration cell electromotive force (EMF) measurements, the electrical conduction behavior of the specimens was investigated in different gases at 500 -1000℃. The influence of nonstoichiometry in the specimens with x≠1 on conduction properties was studied and compared with that in the specimen with x = 1. The results show that the specimens are all perovskite-type orthorhombic structure. At 500 - 1000℃, electron conduction is dominant in nitrogen; electron-hole conduction is dominant in oxygen or air; proton conduction is dominant in hydrogen, and the total electrical conductivities of the specimens are about two orders of magnitude higher than those in hydrogen-free atmosphere (nitrogen, air or oxygen). The electrical conductivity of the same specimen in water vapor-saturated nitrogen, air, oxygen or hydrogen is higher than that in corresponding gas without water vapor. The electrical conductivities of the nonstoichiometric specimens are higher those of the stoichiometric one.更多还原