SrCe_(0.85)Yb_(0.15)O_(3-α)陶瓷的中温导电性研究  

Electrical Conductivity of SrCe_(0.85)Yb_(0.15)O_(3-α) Ceramic at Intermediate Temperature

作　　者：王洪涛[1,2] 张慧[1] 杜娜娜[1] 马桂林[2] 

机构地区：[1]阜阳师范学院化学化工学院,安徽阜阳236041 [2]苏州大学材料与化学化工学部,江苏苏州215123

出　　处：《太原科技大学学报》2009年第4期316-319,共4页Journal of Taiyuan University of Science and Technology

基　　金：国家自然科学基金资助项目(20771079);安徽青年教师"资助计划"项目(2007jq1142);阜阳师范学院院科研项目(2007LQ05;2007LQ06;2008LQ15)

摘　　要：以高温固相反应法合成了质子导电性氧化物陶瓷SrCe0．85Yb0．15O3-α粉末XRD结果表明，该陶瓷样品为单一斜方相钙钛矿型结构。以陶瓷样品为固体电解质、Ag—Pd合金为电极，采用交流阻抗谱技术和气体浓差电池方法分别测定了样品在400℃～800℃下、干燥空气及湿润氢气中的电动势及离子迁移数．研究了样品的离子导电特性。结果表明：在干燥空气中，陶瓷样品是一个氧离子与空穴的混合导体：在湿润氢气中，陶瓷样品的质子迁移数为1，是一个纯的质子导体。Ag—Pd合金电极有助于电导率的提高。Proton-conducting SrCe0.85Yb0.15O3-α ceramic was prepared by high-temperature solid state reaeuon. A-ray powder diffraction pattern shows that the ceramic is a single orthorhombie phase of perovskite-type SrCeO3. Using the ceramic as solid electrolyte and Ag-Pd alloy as electrodes,the measurements of EMFs and ionic transport numbers on SrCe0.85Yb0.15O3-α ceramic were performed by using ac impedence spectroscopy and gas concentration cell methods in the temperature range of 400 ℃ - 800 ℃ in dry air and wet hydrogen,respectively- The results indicate that the sample is a mixed conductor of oxide-ion and hole in dry air. In wet hydrogen atmosphere, the protonic transport number is unity and the sample is a pure protonic conductor. Ag-Pd alloy electrodes help to the improvement of conductivity.

关 键 词：SrCe0.85Yb0.15O3-α气体浓差电池 离子迁移数 质子导体 

分 类 号：O614.3[理学—无机化学]