Material properties of La0.8Sr0.2Ga9+xMg0.1O3-δ as a function of Ga content

被引：25

作者：

Ahmad-Khanlou, A ^{[1
]}

Tietz, F ^{[1
]}

Stöver, D ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Werkstoffe & Verfahren Energietech, IWV1, D-52425 Julich, Germany

来源：

SOLID STATE IONICS | 2000年 / 135卷 / 1-4期

关键词：

SOFC; solid electrolyte; lanthanum gallate; phase stability; sintering behavior; microstructure; ionic conductivity;

D O I：

10.1016/S0167-2738(00)00435-5

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 crystalline phases, sintering behavior, microstructure and conductivity of the compound La0.8Sr0.2Ga0.9-xMg0.1O3-delta (-0.02<x<0.04) were characterized as a function of Ga content. Depending on thermal treatment and Ga content, the compounds LaSrGa3O7, LaSrGaO4 and La2O3 were identified in addition to the perovskite phase. Dilatometric measurements have shown that a volume expansion occurs in the range from 1300 degreesC to 1500 degreesC, which decreases from x=-0.02 towards x=0.04. This seems to be due to the amount of the second phase LaSrGaO4 present. The ionic conductivity decreases with increasing Ga content, which is attributed to both the reduction of the oxygen vacancy concentration and the formation of the insulating LaSrGa3O7 phase. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：543 / 547

页数：5

共 8 条

[1]

AHMADKHANLOU A, 1998, WERKSTOFFWOCHE 98 MU, V3, P161

[2]

BAI W, 1998, 3 EUR SOFC FOR, V2, P1

[3] Second phases in doped lanthanum gallate perovskites [J].

Djurado, E ;

Labeau, M .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1998, 18 (10) :1397-1404

[4]

Huang KQ, 1998, J AM CERAM SOC, V81, P2565, DOI 10.1111/j.1151-2916.1998.tb02662.x

[5] 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

[6]

ISHIHARA T, 1994, J AM CHEM SOC, V116, P3081

[7] Effect of A-site cation nonstoichiometry on the properties of doped lanthanum gallate [J].

Stevenson, JW ;

Armstrong, TR ;

Pederson, LR ;

Li, J ;

Lewinsohn, CA ;

Baskaran, S .

SOLID STATE IONICS, 1998, 113 :571-583

[8]

YAMAJI K, 1997, SOLID OXIDE FUEL CEL, V5, P1041

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