Study on La and Y co-doped ceria-based electrolyte materials

被引：0
|
作者：
Sha, Xueqing [1 ]
Lü, Zhe [1 ]
Huang, Xiqiang [1 ]
Miao, Jipeng [1 ]
Ding, Zhanhui [3 ]
Xin, Xianshuang [1 ]
Su, Wenhui [1 ,2 ,3 ,4 ]
机构：
[1] Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin, 150001, China
[2] Department of Physics, Dalian University of Technology, Dalian, 116024, China
[3] Department of Condensed Matter Physics, Jilin University, Changchun, 130023, China
[4] International Center for Materials Physics, Academia Sinica, Shenyang, 110015, China
来源：
Journal of Alloys and Compounds | 2007年 / 428卷 / 1-2期
关键词：
Co-doped ceria electrolytes of Ce0.8La0.2-xYxO1.9 (x = 0.02; 0.06; 0.10; 0.14; 0.20) fine powders were prepared with the sol-gel method. The results of X-ray diffraction and Raman spectroscopy showed that all powders crystallite calcined at 800 °C were single phase with cubic fluorite structure; the average crystallite sizes calculated by the Scherrer formula were between 27 and 34 nm; which was in good agreement with the results of TEM and particle size distribution measurements. The thermal expansion curves of C e0.8 L a0.2 - x Yx O1.9 were measured and the thermal expansion coefficients (TEC) between 100 and 800 °C were calculated. For the samples of Ce0.8La0.2-xYxO1.9; in the temperature range of 700-850 °C; when x = 0.06; and; much higher ionic conductivity was observed than those of the singly doped ceria with same dopant concentration (20% trivalent rare earth) and when x = 0.06; maximal conductivity is obtained. It suggested that co-doping with appropriate ratio of lanthanum and yttrium can further improve the electrical performance of ceria-based electrolytes; and these co-doped samples may be the better electrolytes for intermediate-temperature solid oxide fuel cells. © 2006 Elsevier B.V. All rights reserved;
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