Correlation between oxygen transport properties and microstructure in La0.5Sr0.5FeO3-δ

被引：43

作者：

Diethelm, S ^{[1
]}

Van Herle, J

Sfeir, J

Buffat, P

机构：

[1] Swiss Fed Inst Technol, Lab Ind Energy Syst, LENI, STI, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, HTceramix, CH-1015 Lausanne, Switzerland

[3] Swiss Fed Inst Technol, Interdisciplinary Ctr Electron Microscopy, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2005年 / 25卷 / 12期

关键词：

grain growth; grain size; grain boundaries; ionic conductivity; perovskites;

D O I：

10.1016/j.jeurceramsoc.2005.03.028

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：

The effect of the bulk microstructure (grain size distribution, grain boundary composition) on the oxygen transport properties of La0.5Sr0.5FeO3 membranes was investigated. For this purpose, samples with different microstructures were prepared by modifying the sintering duration and/or temperature. The average grain sizes, ranging from 0.20 to 1.43 mu m, were determined from SEM analysis. The oxygen transport properties of these samples were characterised by permeation measurement. The fluxes presented a change in the activation energy which was attributed to a change in the rate limiting step, from bulk diffusion at lower temperature (< 850 degrees C) to surface limitations at higher temperature (> 900 degrees C). Only the transport through the bulk was influenced by the microstructure, with the highest flux for the smallest grains. This would imply that oxygen transport occurs more rapidly along the grain boundaries than through the bulk. Grain and grain boundary compositions were analysed by TEM. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2191 / 2196

页数：6

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