Mixed electronic and ionic conductivity of LaCo(M)O3 (M = Ga, Cr, Fe or Ni) -: II.: Oxygen permeation through Cr- and Ni-substituted LaCoO3

被引：58
|
作者：
Kharton, VV [1 ]
Kovalevsky, AV [1 ]
Tikhonovich, VN [1 ]
Naumovich, EN [1 ]
Viskup, AP [1 ]
机构：
[1] Belarusian State Univ, Inst Physicochem Problems, Minsk 220080, BELARUS
来源：
SOLID STATE IONICS | 1998年 / 110卷 / 1-2期
关键词：
perovskite; mixed conductor; oxygen permeability; ceramic membrane; thermal expansion;
D O I：
10.1016/S0167-2738(98)00116-7
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 oxygen permeation fluxes, electrical conductivity and ther mal expansion of LaCo1-xCrxO3 (x = 0.1-0.4) solid solutions have been ascertained to decrease with increasing chromium concentration. The dependence of the oxygen permeability on thickness of the LaCo1-xCrxO3 (x < 0.3) dense ceramic membranes suggests a presence of surface-exchange limitations of the oxygen transport. Introduction of nickel into the cobalt sublattice of LaCo1-xNixO3 has been found to result in a sharp decrease of the oxygen ionic conductivity which is the flux-limiting factor. Electronic conductivity of the solid solutions increases with nickel content. A prolonged stabilization process to attain stationary oxygen flux through LaCo(Cr)O-3 and LaCo(Ni)O-3 membranes has been pointed out. Thermal expansion coefficients of the ceramics have been calculated from the dilatometric data to be in the range (17.3-23.7)X 10(-6) K-1. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：53 / 60
页数：8
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