Influence of grain size on the bulk and grain boundary ion conduction behavior in gadolinia-doped ceria

被引：47

作者：

Lenka, R. K. ^{[1
]}

Mahata, T. ^{[1
]}

Tyagi, A. K. ^{[2
]}

Sinha, P. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Energy Convers Mat Sect, Navi Mumbai 400705, India

[2] Bhabha Atom Res Ctr, Div Chem, Bombay 400085, Maharashtra, India

来源：

SOLID STATE IONICS | 2010年 / 181卷 / 5-7期

关键词：

Gadolinia-doped ceria; Combustion synthesis; Fine-grained microstructure; Solid electrolyte; Impedance spectroscopy; STABILIZED-ZIRCONIA; ELECTRICAL-CONDUCTIVITY; SOLID ELECTROLYTES; THIN-FILMS; MICROSTRUCTURE; CERAMICS; SYSTEM;

D O I：

10.1016/j.ssi.2009.12.018

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：

Fine-grained (similar to 0.2 mu m) gadolinia-doped (12 mol.% Gd2O3) ceria pellets with density above 95% of theoretical density were produced by sintering the solution-combustion synthesized powder at 1200 degrees C. Some of these pellets were fired at 1400 and 1500 degrees C to introduce microstructural changes by grain growth. Impedance measurement of the samples was carried out in oxidizing atmosphere at different temperatures in the range of 225 to 1000 degrees C. The measured impedance data were analyzed through impedance plots and impedance spectra to understand the influence of grain size on the bulk and the grain boundary ion conduction behavior. In the low temperature measurements, a significant increase in the total conductivity is observed as the grain size becomes finer. As the grain size decreases the bulk conductivity is found to decrease and grain boundary conductivity is found to increase. Analysis of the impedance spectra indicates that the relaxation frequencies in the bulk and the grain boundary are influenced by grain size. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：262 / 267

页数：6

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