Oxygen permeation through Sr(Ln)CoO3-δ (Ln=La, Nd, Sm, Gd) ceramic membranes

被引：89

作者：

Kovalevsky, AV ^{[1
]}

Kharton, VV ^{[1
]}

Tikhonovich, VN ^{[1
]}

Naumovich, EN ^{[1
]}

Tonoyan, AA ^{[1
]}

Reut, OP ^{[1
]}

Boginsky, LS ^{[1
]}

机构：

[1] Belarusian State Univ, Inst Physicochem Problems, Minsk 220080, BELARUS

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 1998年 / 52卷 / 2-3期

关键词：

oxygen permeation; ceramics; cation vacancies;

D O I：

10.1016/S0921-5107(97)00292-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxygen permeability of Sr0.65-xLa0.35CoO3-delta (X = 0-0.10), Sr0.65La0.35Co0.90O3-delta and Sr(0.7)Ln(0.3)CoO(3-delta) (Ln = La, Nd, Sm, Gd) ceramics was studied under temperatures of 950-1250 K. The experiments held proved that the transfer of oxygen through the strontium cobaltite-based ceramics was limited both by the rate of oxygen exchange between oxides and gas phase and by ionic conductivity of the materials. It has been established that the permeability of materials studied increases rapidly with increase in oxygen partial pressure. A creation of vacancies in both cation sublattices of ABO(3) perovskite results in decreasing oxygen permeation flux. Therewith, cation deficiency in the sublattice B of the cobaltites have a lower influence on oxygen permeability in comparison with ones in the sublattice A. Oxygen permeation flux through Sr(Ln)CoO3-delta ceramics decreases with decreasing mean radius of the cations in the sublattice A. Electrical conductivity of the cobaltites reduces when oxygen partial pressure diminishes or concentration of the cation vacancies increases. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：105 / 116

页数：12

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