Electrochemical permeability of La0.9Sr0.1Ga1-xFexO3-δ

被引：11

作者：

Gharbage, B ^{[1
]}

Figueiredo, FM ^{[1
]}

Baker, RT ^{[1
]}

Marques, FMB ^{[1
]}

机构：

[1] Univ Aveiro, UIMC Ceram & Glass Engn Dept, P-3810193 Aveiro, Portugal

来源：

ELECTROCHIMICA ACTA | 2000年 / 45卷 / 13期

关键词：

lanthanum gallate; p-type conductivity; electrochemical permeability; electronic conductivity; mixed conductors;

D O I：

10.1016/S0013-4686(99)00430-2

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The present work reports estimates for the hole conductivity of lanthanum gallate-based samples (La0.9Sr0.1Ga1-x FexO3-sigma, with x = 0 and x = 0.2), in the range 700-1000 degrees C. These estimates were based on electrochemical permeability measurements, and were compared to previous estimates obtained from ion-blocking measurements. The p-type conductivity of these materials was confirmed to be strongly influenced by the content of Fe. The activation energy for p-type conductivity was found to be in the range 0.9-1 eV, lower than usually observed for alternative electrolytes based in zirconia or ceria. The increase in p-type conductivity with Fe content can be explained by a relatively easy formation of Fe4+ ions under oxidizing conditions, a basic requirement for the establishment of a small polaron-type conduction mechanism. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：2095 / 2099

页数：5

共 17 条

[1] Processing and electrical conductivity of pure, Fe- and Cr-substituted La0.9Sr0.1GaO3 [J].

Baker, RT ;

Gharbage, B ;

Marques, FMB .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1998, 18 (02) :105-112

[2] Ionic and electronic conduction in Fe and Cr doped (La,Sr)GaO3-delta [J].

Baker, RT ;

Gharbage, B ;

Marques, FMB .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (09) :3130-3135

[3] Electrochemical permeability of La1-xSrxCoO3-δ materials [J].

Figueiredo, FM ;

Marques, FMB ;

Frade, JR .

SOLID STATE IONICS, 1998, 111 (3-4) :273-281

[4] Electron hole conductivity of gadolinia doped ceria [J].

Figueiredo, FM ;

Marques, FMB ;

Frade, JR .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1999, 19 (6-7) :807-810

[5] On the accuracy of electrochemical permeability measurements [J].

Figueiredo, FM ;

Marques, FMB ;

Frade, JR .

SOLID STATE IONICS, 1998, 110 (1-2) :45-51

[6] Sr- and Ni-doped LaCaO3 and LaFeO3 perovskites -: New cathode materials for solid-oxide fuel cells [J].

Huang, K ;

Lee, HY ;

Goodenough, JB .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1998, 145 (09) :3220-3227

[7] Superior oxygen ion conductivity of lanthanum gallate doped with strontium and magnesium [J].

Huang, PN ;

Petric, A .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (05) :1644-1648

[8] OXIDATIVE REFORMING OF METHANE USING SOLID OXIDE FUEL-CELL WITH LAGAO3-BASED ELECTROLYTE [J].

ISHIHARA, T ;

HIEI, Y ;

TAKITA, Y .

SOLID STATE IONICS, 1995, 79 :371-375

[9] EFFECTS OF RARE-EARTH CATIONS DOPED FOR LA SITE ON THE OXIDE IONIC-CONDUCTIVITY OF LAGAO3-BASED PEROVSKITE-TYPE OXIDE [J].

ISHIHARA, T ;

MATSUDA, H ;

TAKITA, Y .

SOLID STATE IONICS, 1995, 79 :147-151

[10] Oxygen surface exchange and diffusion in LaGaO3 based perovskite type oxides [J].

Ishihara, T ;

Kilner, JA ;

Honda, M ;

Sakai, N ;

Yokokawa, H ;

Takita, Y .

SOLID STATE IONICS, 1998, 113 :593-600

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