Enhancement of oxygen exchange at the hetero interface of (La,Sr)CoO3/(La,Sr)2CoO4 in composite ceramics

被引：122

作者：

Sase, Maya ^{[1
,2
]}

Yashiro, Keiji ^{[1
]}

Sato, Kazuhisa ^{[1
]}

Mizusaki, Junichiro ^{[1
]}

Kawada, Tatsuya ^{[2
]}

Sakai, Natsuko ^{[3
]}

Yamaji, Katsuhiko ^{[3
]}

Horita, Tenihisa ^{[3
]}

Yokokawa, Harumi ^{[3
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 9808579, Japan

[3] Natl Inst Adv Ind Sci & Technol, Sendai, Miyagi 3058565, Japan

来源：

SOLID STATE IONICS | 2008年 / 178卷 / 35-36期

关键词：

SOFC cathode; oxygen isotope exchange; SIMS; La0.6Sr0.4CoO3; (La; Sr)(2)CoO4;

D O I：

10.1016/j.ssi.2007.11.039

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 preferential reaction path for oxygen isotope exchange was investigated on a large-grained polycrystalline (La0.6Sr0.4)CoO3 With (LaSr)(2)CoO4 grains dispersed as the secondary phase. The isotope exchange experiment was performed at 773 K in O-18 enriched oxygen of 0.2 x 10(5) Pa. Three-dimensional imaging of Secondary Ion Mass Spectrometry (SIMS) was carried out to visualize the isotope distribution. The SIMS image suggested that there are fast oxygen-incorporation paths along the heterophase boundary of (La0.6Sr0.4)CoO3 / (La,Sr)(2)CoO4. The surface exchange coefficient, k for the heterophase boundary was roughly estimated by analyzing the depth profile of O-18. The calculated k was 8 X 10(-6) cm s(-U1), which is larger than the value of k for the surface of single phase La0.6Sr0.4CoO3 by three orders of magnitude. (C) 2007 Elsevier B.V All rights reserved.

引用

页码：1843 / 1852

页数：10

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