Oxygen Release from Grossly Nonstoichiometric SrCo0.8Fe0.2O3-δ Perovskite in Isostoichiometric Mode

被引：21

作者：

Starkov, Ilya A. ^{[1
]}

Bychkov, Sergey F. ^{[1
]}

Chizhik, Stanislav A. ^{[1
]}

Nemudry, Alexandr P. ^{[1
]}

机构：

[1] SB RAS, Inst Solid State Chem & Mechanochem, Novosibirsk 630128, Russia

来源：

CHEMISTRY OF MATERIALS | 2014年 / 26卷 / 06期

关键词：

ELECTRICAL-CONDUCTIVITY RELAXATION; SURFACE EXCHANGE; PERMEATION; DIFFUSION; KINETICS; COEFFICIENTS; DEPENDENCE; MECHANISMS; OXIDES;

D O I：

10.1021/cm4040775

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：

The kinetics of oxygen release from grossly nonstoichiometric perovskite SrCo0.8Fe0.2O3-delta (SCF) with mixed conductivity chosen as a model object was studied for the first time using the oxygen partial pressure relaxation technique. The use of isostoichiometric conditions during the investigation of the oxygen exchange in SCF characterized by a wide homogeneity region made it possible to get information that cannot be obtained using traditional measurements under isobaric conditions. This approach allowed us to discover a kinetic compensation effect: successive oxygen release from SCF was found to result simultaneously in the increase of the apparent activation energy and pre-exponential factor of the reaction rate.

引用

页码：2113 / 2120

页数：8

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