Oxygen tracer diffusion in undoped lanthanum manganites

被引：82

作者：

Berenov, AV ^{[1
]}

MacManus-Driscoll, JL ^{[1
]}

Kilner, JA ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England

来源：

SOLID STATE IONICS | 1999年 / 122卷 / 1-4期

关键词：

lanthanum manganites; cation non-stoichiometry; oxygen diffusion; SIMS; solid oxide fuel cells; cathodes;

D O I：

10.1016/S0167-2738(99)00077-6

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 oxygen tracer diffusion was studied in cation stoichiometric (LaMnO3 +/- delta) and A-site deficient (La0.9MnO3 +/- delta) lanthanum manganites by the isotope exchange depth profiling (IEDP) technique using SIMS depth profiling. The measured oxygen tracer diffusion coefficients were in the range of 10(-12) to 10(-15) cm(2) s(-1) and these values were comparable with the ones determined in Sr-doped lanthanum manganites. The activation energy of oxygen tracer diffusion was 240+/-23 kJ/mol in LaMnO3 +/- delta and 294 +/- 11 kJ/mol in La0.9MnO3 +/- delta. A-site deficiency of up to 10% does not affect oxygen tracer diffusion in these lanthanum manganites. Evidence for fast diffusion paths assigned to grain boundary diffusion was observed in the A-site deficient material. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：41 / 49

页数：9

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