Effect of phase transition on high-temperature electrical properties of GdBaCo2O5+x layered perovskite

被引：109

作者：

Tarancon, A. ^{[1
,2
]}

Marrero-Lopez, D. ^{[2
]}

Pena-Martinez, J. ^{[2
]}

Ruiz-Morales, J. C. ^{[2
]}

Nunez, P. ^{[2
]}

机构：

[1] Univ Barcelona, EME CeRMAE UB IN2, Dept Elect, E-08028 Barcelona, Spain

[2] Univ La Laguna, Dept Inorgan Chem, San Cristobal la Laguna 38200, Spain

来源：

SOLID STATE IONICS | 2008年 / 179卷 / 17-18期

关键词：

SOFC; cathode; layered perovskite; GBCO; phase transition;

D O I：

10.1016/j.ssi.2008.04.028

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 effect of the structural phase transition on the electrical and electrochemical properties of GdBaCo2O5+x has been analysed in order to evaluate its suitability as an electrode material for high-temperature applications, in particular as a cathode for Solid Oxide Fuel Cells (SOFCs). X-ray diffraction evolution with the temperature and differential scanning calorimetry were used to determine Structural features of the phase transition, e.g. phases symmetry, thermal expansion coefficients, transition temperatures and enthalpy changes. Four-probe dc-electrical measurements of dense pellets of GdBaCo2O5+x and electrochemical characterization by means of impedance spectroscopy as a part of a symmetrical cell (GdBaCo2O5+x/La0.9Sr0.1Ga0.8Mg0.2O3-delta/GdBaCo2O5+x) were carried out yielding high stability of this material across the mentioned phase transition. The thermal relation of the oxygen stoichiometry with the structural and electrical features revealed the importance of the oxygenation/deoxygenation processes taking place in this material. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：611 / 618

页数：8

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