Effect of Ce and Yb co-doping on conductivity of LaNbO4

被引：19
|
作者：
Cao, Yong [1 ]
Chi, Bo [1 ]
Pu, Jian [1 ]
Jian, Li [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Ctr Fuel Cell Innovat, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2014年 / 34卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Lanthanum orthoniobate; Cerium and ytterbium; Conductivity; Solid oxide fuel cell; Anode; PROTON CONDUCTIVITY; HYDRATION; ZEOLITE; SPECTRA; OXYGEN;
D O I：
10.1016/j.jeurceramsoc.2014.01.011
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
La1-x-yCexYbyNbO4 specimens with various Ce and Yb contents were prepared by solid reactions, and their crystal structure, element valence, sinterability and conductivity were investigated. LaNbO4-type single phase was formed at 1200 degrees C in air, and the lattice of La1-x-yCexYbyNbO4 was distorted from that of LaNbO4 to various extents, depending on the added amount of Ce and Yb. Both La and Nb remained the same valence as they are in LaNbO4; Ce4+, Ce3+ and Yb3+ were detected at room temperature. Highly densified La1-x-yCexYbyNbO4 specimens were achieved by sintering at above 1215 degrees C in air with conductivity 1-2 orders higher than that of pure LaNbO4 in dry air, wet air and wet 5% H-2-N-2 atmospheres. The conductivity changed with testing atmosphere owing to the competition of electron and proton conduction; and maximal value 4.7 x 10(-4) S cm(-1) was obtained in wet air at 900 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1981 / 1988
页数：8
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