Oxygen-ionic conductivity of perovskite-type La1-xSrxGa1-yMgyM0.20O3-δ (M = Fe, Co, Ni)

被引：28
|
作者：
Yaremchenko, AA
Shaula, AL
Logvinovich, DI
Kharton, VV [1 ]
Kovalevsky, A
Naumovich, EN
Frade, JR
Marques, FMB
机构：
[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal
[2] Belarusian State Univ, Inst Physicochem Problems, Minsk 220050, BELARUS
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2003年 / 82卷 / 03期
关键词：
ceramics; electrochemical techniques; electrical conductivity; diffusion;
D O I：
10.1016/S0254-0584(03)00329-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The oxygen-ionic conductivity of perovskite-type La1-xSrxGa0.80-yMgyM0.2O3-delta (x = 0-0.20, y = 0.15-0.20, M = Fe, Co, Ni) and La0.50Pr0.50Ga0.65Mg0.15Ni0.2O3-delta in air, determined by the measurements of total conductivity, faradaic efficiency and oxygen permeability at 973-1223 K, increases with increasing concentration of the acceptor-type dopants, within the solid solution formation limits. The level of ionic conduction in these phases is, however, lower than that in parent compounds, La1-xSrxGa1-yMgyO3-delta, probably due to partial oxygen-vacancy ordering and a higher average cation-anion bond energy in transition metal-containing gallates. The activation energy for ionic transport in La1-xSrxGa0.80-gammaMgyM0.20O3-delta varies in the range of 126-171 kJ mol(-1). For compositions containing different transition metal cations, the ionic transport increases in the sequence M = Co < Fe < Ni, with the maximum ionic conductivity observed for La0.90Sr0.10Ga0.65Mg0.15Ni0.20O3-delta perovskite. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：684 / 690
页数：7
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