Enhanced ionic conductivity in pyrochlore and fluorite mixed phase yttrium-doped lanthanum zirconate

被引：27
作者：
Yang, Fan [1 ]
Wang, Yanfei [1 ]
Zhao, Xiaofeng [2 ]
Xiao, Ping [1 ,2 ]
机构：
[1] Univ Manchester, Ctr Mat Sci, Sch Mat, Manchester M13 9PL, Lancs, England
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2015年 / 273卷
关键词：
Yttrium-doped lanthanum zirconate; Conductivity; Impedance; Phase boundary; Finite element modelling; ELECTRICAL-CONDUCTIVITY; OXYGEN-ION; SUBSTITUTION; DIFFUSION; SYSTEM;
D O I：
10.1016/j.jpowsour.2014.09.067
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of yttrium-doped lanthanum zirconate (La1-xYx)(2)Zr2O7 (0 <= x <= 1) bulk samples were prepared and their ionic conductivities were studied by impedance spectroscopy. It is found that intermixing of Y and La ions increases the conductivity of the end members pyrochlore-type La2Zr2O7 and fluorite-type Y2Zr2O7. Highest conductivity which is 2-3 orders of magnitude higher than that of La2Zr2O7 and Y2Zr2O7 is achieved in a two-phase sample which consists of both pyrochlore and fluorite phases. The enhanced conductivity in the two-phase sample is attributed to the presence of the pyrochlore-fluorite phase boundary, which has higher conductivity than the pyrochlore and the fluorite phase grains. The effect of the conductive phase boundary has been confirmed by a 2-dimensional finite element modelling. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：290 / 297
页数：8
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