Introduction of A-site deficiency into La0.6Sr0.4Co0.2Fe0.8O3-δ and its effect on structure and conductivity

被引：162

作者：

Mineshige, A ^{[1
]}

Izutsu, J ^{[1
]}

Nakamura, M ^{[1
]}

Nigaki, K ^{[1
]}

Abe, J ^{[1
]}

Kobune, M ^{[1
]}

Fujii, S ^{[1
]}

Yazawa, T ^{[1
]}

机构：

[1] Univ Hyogo, Grad Sch Engn, Dept Mat Sci & Chem, Himeji, Hyogo 6712201, Japan

来源：

SOLID STATE IONICS | 2005年 / 176卷 / 11-12期

关键词：

mixed conductor; nonstoichiometry; solid oxide fuel cell; perovskite-type oxide;

D O I：

10.1016/j.ssi.2004.11.021

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：

A-site deficiency was introduced intentionally into the mixed conducting perovskite ABO(3)-type oxide, La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF=6/4/2/8), in order to create additional oxygen vacancies. With increasing Sr-deficiency, z in La0.6Sr0.4-zCo0.2Fe0.8O3-delta, its lattice parameters and oxygen content gradually increased and decreased, respectively, which strongly suggested that additional oxygen vacancies were created in the lattice. It is expected that these additional oxygen vacancies improve its oxide ionic conductivity and catalytic property for oxygen reduction. Further increase in z, however, led the LSCF system into a coexistence region with transition metal oxides. In the wide range of P(O-2), electrical property of samples 0.00 <= z <= 0.025 was p-type semi-conducting regardless of the z value, whereas its conductivity was strongly affected by a subtle change in z. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1145 / 1149

页数：5

共 20 条

[1] IMMITTANCE RESPONSE OF LA0.6SR0.4CO0.2FE0.8O3 BASED ELECTROCHEMICAL-CELLS [J].