YANG Chenyu, ZHOU Fen, BAO Jinxiao, GAO Jianquan, SONG Xiwen
(School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China)
Abstract: Ce0.8Gd0.15−xNdxCa0.05O2−δelectrolyte powder was prepared by using sol-gel method. The effect of Gd3+ and Nd3+ co-doping on structure and electrical properties of the cerium oxide electrolyte was studied, when the total doping amount of Gd3+ Nd3+ and Ca2+ was fixed (20 mol%). X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS) and UV-visible spectrophotometer were used to characterize the samples. It is shown that the electrolyte powder calcined at 800 ℃ for 3h is a single phase solid solution with cubic fluorite structure. Relative density of ceramic sheet is >95%. As the doping content x of Nd was 0.10, oxygen vacancy concentration of the electrolyte was maximized. At 700 ℃, Ce0.8Gd0.05Nd0.10Ca0.05 O1.875 had highest conductivity (2.04×10−2 S·cm-1).
Key words: cerium oxide based electrolyte; sol-gel electrochemistry; electrical conductivity