High Temperature Crystal Chemistry and Oxygen Permeation Properties of the Mixed Ionic-Electronic Conductors LnBaCo2O5+δ (Ln = Lanthanide)

被引：102

作者：

Kim, J-H. ^{[1
,2
]}

Mogni, L. ^{[3
]}

Prado, F. ^{[4
]}

Caneiro, A. ^{[3
]}

Alonso, J. A. ^{[5
]}

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

机构：

[1] Univ Texas Austin, Electrochem Energy Lab, Austin, TX 78712 USA

[2] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[3] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Univ Nacl Sur, Dept Fis, RA-8000 Bahia Blanca, Buenos Aires, Argentina

[5] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 12期

关键词：

OXIDE FUEL-CELLS; SURFACE EXCHANGE KINETICS; CATHODE MATERIALS; ELECTRICAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; THERMAL-EXPANSION; PEROVSKITE; GD; TRANSITION; PHASES;

D O I：

10.1149/1.3231501

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The high temperature crystal chemistry and oxygen permeation properties of the cation-ordered LnBaCo(2)O(5+delta) perovskite oxides [lanthanide (Ln) = Pr, Nd, and Sm] have been investigated in comparison with the cation-disordered La0.5Ba0.5CoO3-delta perovskite. The LnBaCo(2)O(5+delta) (Ln = Pr, Nd, and Sm) oxides exhibit a metal-insulator transition at T < 200 degrees C, as evidenced by total conductivity measurements and high temperature X-ray diffraction data and an oxygen vacancy order-disorder transition at T > 350 degrees C in air, as evidenced by an orthorhombic to tetragonal transition. At a given temperature, the oxygen permeation flux decreases from Ln = La to Nd to Sm due to the changes in crystal symmetry and lattice strain. The oxygen permeation mechanism in the Ln = Nd is bulk-diffusion-limited rather than surface-exchange-limited for membrane thickness L >= 1.1 mm. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3231501] All rights reserved.

引用

页码：B1376 / B1382

页数：7

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