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

页码：873 / 878

页数：6

共 13 条

[11] OXIDATIVE NONSTOICHIOMETRY IN PEROVSKITES, AN EXPERIMENTAL SURVEY - DEFECT STRUCTURE OF AN OXIDIZED LANTHANUM MANGANITE BY POWDER NEUTRON-DIFFRACTION [J].

TOFIELD, BC ;

SCOTT, WR .

JOURNAL OF SOLID STATE CHEMISTRY, 1974, 10 (03) :183-194

[12] Oxygen tracer diffusion coefficient of (La,Sr)MnO3+/-delta [J].

Yasuda, I ;

Ogasawara, K ;

Hishinuma, M ;

Kawada, T ;

Dokiya, M .

SOLID STATE IONICS, 1996, 86-8 :1197-1201

[13] Electrical conductivity and chemical diffusion coefficient of strontium-doped lanthanum manganites [J].

Yasuda, I ;

Hishinuma, M .

JOURNAL OF SOLID STATE CHEMISTRY, 1996, 123 (02) :382-390

← 1 2 →