Oxygen tracer diffusion coefficient of (La,Sr)MnO3+/-delta

被引：148

作者：

Yasuda, I ^{[1
]}

Ogasawara, K ^{[1
]}

Hishinuma, M ^{[1
]}

Kawada, T ^{[1
]}

Dokiya, M ^{[1
]}

机构：

[1] NATL INST MAT & CHEM RES,TSUKUBA RES CTR,TSUKUBA,IBARAKI 305,JAPAN

来源：

SOLID STATE IONICS | 1996年 / 86-8卷

关键词：

oxygen diffusion; solid oxide fuel cell; polarization loss; ion conductivity;

D O I：

10.1016/0167-2738(96)00287-1

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：

To understand the mechanism of oxygen diffusion, the oxygen tracer diffusion coefficient, D-0*, of strontium-doped lanthanum manganites, La1-xSrxMnO3+/-delta (x = 0.05, 0.10, 0.15 and 0.20) was measured as a function of composition, temperature and oxygen partial pressure. The measured D-0* was as low as 10(-12) to 10(-11) cm(2) s(-1) at 1000 degrees C, from which the ionic conductivity of 10(-7) to 10(-6) S/cm was estimated. Because of such a poor ionic conductivity, the possibility for the bulk diffusion of oxide ions to contribute to the cathode reactions in solid oxide fuel cells is considered to be sparse. The negative dependence of D-0* on the oxygen partial pressure suggests the vacancy mechanism for oxygen diffusion.

引用

页码：1197 / 1201

页数：5

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