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

共 26 条

[21] Survey of materials selection for ceramic fuel cells .2. Cathodes and anodes
Steele, BCH
[J]. SOLID STATE IONICS, 1996, 86-8 : 1223 - 1234
[22] SINTERING BEHAVIOR OF DOPED LANTHANUM AND YTTRIUM MANGANITE
STEVENSON, JW
HALLMAN, PF
ARMSTRONG, TR
CHICK, LA
[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1995, 78 (03) : 507 - 512
[23] TAGAWA H, 1997, P 5 INT S SOL OX FUE, V18, P785
[24] TSAI T, 1997, P 5 INT S SOL OX FUE, V18, P368
[25] VANROOSMALEN JAM, 1991, P 2 INT S SOL OX FUE, P507
[26] Yasuda I, 1997, J AM CERAM SOC, V80, P3009, DOI 10.1111/j.1151-2916.1997.tb03226.x

← 1 2 3 →