Determination of the oxygen chemical diffusion coefficient in perovskites by a thermogravimetric method

被引：10
|
作者：
Mikkelsen, L [1 ]
Skou, E
机构：
[1] Riso Natl Lab, Mat Res Dept, DK-4000 Roskilde, Denmark
[2] Univ So Denmark Odense Univ, Dept Chem, DK-5230 Odense, Denmark
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2001年 / 64卷 / 03期
关键词：
diffusion; perovskite;
D O I：
10.1023/A:1011542123348
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A thermogravimetric method has been used for the determination of the oxygen chemical diffusion coefficients in La(1-x)Sr(x)MnO(3+delta); x=0; 0.05; 0.10; 0.15 (LSM). A temperature range of 700-1000 degreesC was studied. The chemical diffusion coefficient varies between 1.6.10(-13) and 1.8.10(-10) cm(2) s(-1) for the samples in the temperature range studied. The activation energy for oxygen chemical diffusion was determined to be 190-280 kJ mol(-1) for the LSM samples. The magnitude of the chemical diffusion coefficients of the LSM samples does not depend on the strontium site occupation factor.
引用
收藏
页码：873 / 878
页数：6
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