Thermogravimetric studies of oxygen stoichiometry and oxygen transport kinetics in lanthanum strontium ferrite manganites

被引：7

作者：

Kjær, J ^{[1
]}

Andersen, IGK ^{[1
]}

Skou, E ^{[1
]}

机构：

[1] Odense Univ, Dept Chem, DK-5230 Odense M, Denmark

来源：

SOLID STATE IONICS | 1998年 / 113卷

关键词：

lanthanum strontium ferrite manganites; oxygen stoichiometry; oxygen transport kinetics;

D O I：

10.1016/S0167-2738(98)00382-8

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：

Oxygen stoichiometry and transport in (La1-xSrx)(0.95)FeyMn1-yOz (0 less than or equal to x less than or equal to 0.30, 0 less than or equal to y less than or equal to 0.7) was investigated by thermogravimetry at 800-1000 degrees C upon repetitive changes between N-2- and N-2/O-2-atmospheres and by chemical analysis. The materials was found to be overstoichiometric with respect to oxygen. in air at 1000 degrees C at low substitution levels changing to understoichiometric at the highest substitution levels. The oxygen transport kinetics and the oxygen diffusion coefficients were determined from the weight changes vs. time and from SEM and X-ray data on crystallite dimensions. For powdered samples, oxygen diffusion coefficients in the range 10(-15)-10(-11) cm(2)/s are reported. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：387 / 392

页数：6

共 13 条

[1] DETERMINATION OF STOICHIOMETRY IN LANTHANUM STRONTIUM MANGANATES(III)(IV) BY WET CHEMICAL METHODS [J].