کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1478984 | 991241 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Correlation between oxygen transport properties and microstructure in La0.5Sr0.5FeO3âδ
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 μm, 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 °C) to surface limitations at higher temperature (>900 °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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 25, Issue 12, 2005, Pages 2191-2196
Journal: Journal of the European Ceramic Society - Volume 25, Issue 12, 2005, Pages 2191-2196
نویسندگان
Stefan Diethelm, Jan Van herle, Joseph Sfeir, Philippe Buffat,