The types of surface exchange and diffusion of oxygen in La0.7Sr0.3CoO3-δ

被引：25

作者：

Ezin, AN ^{[1
]}

Kurumchin, EK ^{[1
]}

Murygin, IV ^{[1
]}

Tsidilkovski, VI ^{[1
]}

Vdovin, GK ^{[1
]}

机构：

[1] Russian Acad Sci, Ural Div, Inst High Temp Electrochem, Ekaterinburg 620219, Russia

来源：

SOLID STATE IONICS | 1998年 / 112卷 / 1-2期

关键词：

isotopic exchange; exchange mechanisms; diffusion; La1-xSrxCoO3-delta;

D O I：

10.1016/S0167-2738(98)00199-4

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 the oxygen isotopic exchange between La0.7Sr0.3CoO3-delta and oxygen gas has been studied at on oxygen pressure of 1.28 x 10(3) Pa and temperatures from 786 to 875 degrees C. Experimental time dependencies of molecules (OO)-O-16-O-16, (OO)-O-18-O-16, (OO)-O-18-O-18 content in the gas phase have been analyzed by the method first proposed by the authors. Using this method we have directly calculated both the rates of the different types of surface exchange and the bulk diffusivity of oxygen from experimental data. It has been shown that under the experiment conditions at elevated temperatures the surface exchange proceed by the dissociative adsorption-desorption mechanism. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：117 / 122

页数：6

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