Oxygen nonstoichiometry and defect chemistry of the mixed conductor La0.9Ca0.1FeO3-δ at low oxygen partial pressure

被引：29

作者：

Geary, Tim C. ^{[1
]}

Adler, Stuart B. ^{[1
]}

机构：

[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA

来源：

SOLID STATE IONICS | 2013年 / 253卷

基金：

美国国家科学基金会;

关键词：

Coulometric titration; Perovskite; Oxygen nonstoichiometry; Mixed conductor; SOEC; SOFC; ELECTRICAL-PROPERTIES; IONIC-CONDUCTIVITY; STABILITY; CA;

D O I：

10.1016/j.ssi.2013.08.039

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 equilibrium oxygen nonstoichiometry, delta, for the mixed ionic and electronic conducting perovskite La0.9Ca0.1FeO3 - delta (LCF91) was measured for oxygen partial pressures, P-O2, between 10(-3) and 10(-21) atm and temperatures of 750 to 900 degrees C using a tubular, two-probe Pt vertical bar YSZ vertical bar LCF coulometric titration cell. XRD experiments confirmed that LCF91 remains a single phase perovskite under the reducing conditions of a fuel electrode, and reveal no evidence of reaction with the zirconia electrolyte. The P-O2-nonstoichiometry relationship can be interpreted using a dilute-solution point-defect model involving oxygen vacancies, electrons, and electron holes. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：88 / 93

页数：6

共 27 条

[1] Synthesis, structural and magnetic properties of La1-xCaxFeO3 prepared by the co-precipitation method [J].

Abdel-Khalek, E. K. ;

Mohamed, Hany M. .

HYPERFINE INTERACTIONS, 2013, 222 :S57-S67

[2] Factors governing oxygen reduction in solid oxide fuel cell cathodes [J].

Adler, SB .

CHEMICAL REVIEWS, 2004, 104 (10) :4791-4843

[3] Reactivity of lanthanide ferrite SOFC cathodes with YSZ electrolyte [J].

Anderson, MD ;

Stevenson, JW ;

Simner, SP .

JOURNAL OF POWER SOURCES, 2004, 129 (02) :188-192

[4] Structural and electrical properties of calcium substituted lanthanum ferrite powders [J].

Andoulsi, Refka ;

Horchani-Naifer, Karima ;

Ferid, Mokhtar .

POWDER TECHNOLOGY, 2012, 230 :183-187

[5] Synthesis and characterisation of La1-xCaxFeO3 perovskite-type oxide catalysts for total oxidation of volatile organic compounds [J].

Barbero, Bibiana P. ;

Gamboa, Julio Andrade ;

Cadus, Luis E. .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 65 (1-2) :21-30

[6] The effect of Ca, Sr, and Ba doping on the ionic conductivity and cathode performance of LaFeO3 [J].

Bidrawn, F. ;

Lee, S. ;

Vohs, J. M. ;

Gorte, R. J. .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2008, 155 (07) :B660-B665

[7] La, Ca and Fe oxide perovskites: preparation, characterization and catalytic properties for methane combustion [J].

Ciambelli, P ;

Cimino, S ;

Lisi, L ;

Faticanti, M ;

Minelli, G ;

Pettiti, I ;

Porta, P .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2001, 33 (03) :193-203

[8] Oxygen permeation and stability of La0.4Ca0.6Fe1-xCoxO3-δ (x=0, 0.25, 0.5) membranes [J].

Diethelm, S ;

Van herle, J ;

Middleton, PH ;

Favrat, D .

JOURNAL OF POWER SOURCES, 2003, 118 (1-2) :270-275

[9]

Dyer P. N., 2002, U.S. Patent, Patent No. [6492290 B1, 6492290, US6492290 B1]

[10] Microstructures and electrical properties of calcium substituted LaFeO3 as SOFC cathode [J].

Hung, Ming-Hao ;

Rao, M. V. Madhava ;

Tsai, Dah-Shyang .

MATERIALS CHEMISTRY AND PHYSICS, 2007, 101 (2-3) :297-302

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