Interphase exchange and diffusion of oxygen in lanthanum-strontium cobaltites doped with iron

被引：25

作者：

Ananyev, M. V. ^{[1
]}

Kurumchin, E. Kh. ^{[1
]}

机构：

[1] Russian Acad Sci, Ural Div, Inst High Temp Electrochem, Ekaterinburg 620219, Russia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2010年 / 84卷 / 06期

关键词：

SURFACE EXCHANGE; OXIDES; NONSTOICHIOMETRY;

D O I：

10.1134/S0036024410060269

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：

Oxides La(0.4)Sr(0.6)Co(1 - x) Fe (x) O(3 - delta) (x = 0.2 and 0.4) were synthesized by the ceramic technology. The kinetics of exchange and diffusion of oxygen in these oxides were studied by the isotopic exchange method over the temperature range 600-900A degrees C at an oxygen pressure of 10 torr. The temperature dependences of interphase exchange rate and oxygen diffusion coefficient in the bulk and near-surface region were obtained, and the effective activation energies of exchange and oxygen diffusion were calculated. The concentration of iron ions was shown to have no substantial influence on the exchange rate and oxygen diffusion. Ratio between the values of exchange rate and diffusion coefficient were shown to influent on the precision of the values estimation.

引用

页码：1039 / 1044

页数：6

共 16 条

[1] Phase equilibria and crystal structures of solid solutions in the system LaCoO3-δ-SrCoO2.5±δ-SrFeO3-δ-LaFeO3-δ [J].

Aksenova, T. V. ;

Anan'ev, M. V. ;

Gavrilova, L. Ya. ;

Cherepanov, V. A. .

INORGANIC MATERIALS, 2007, 43 (03) :296-300

[2]

Boreskov G.K., 1986, HETEROGENEOUS CATALY

[3]

BURCHER E, 2006, SOLID STATE IONICS, V177, P3109

[4] Oxygen permeation through La0.4Sr0.6Co0.2Fe0.8O3-δ membrane [J].

Chen, CS ;

Zhang, ZP ;

Jiang, GS ;

Fan, CG ;

Liu, W ;

Bouwmeester, HJM .

CHEMISTRY OF MATERIALS, 2001, 13 (09) :2797-2800

[5] Synthesis, structure and oxygen nonstoichiometry of La0.4Sr0.6Co1-yFeyO3-δ [J].

Cherepanov, V. A. ;

Gavrilova, L. Ya. ;

Aksenova, T. V. ;

Ananyev, M. V. ;

Bucher, E. ;

Caraman, G. ;

Sitte, W. ;

Voronin, V. I. .

PROGRESS IN SOLID STATE CHEMISTRY, 2007, 35 (2-4) :175-182

[6] Isotopic exchange and diffusion of oxygen in oxides with different bulk and subsurface diffusivities [J].

Ezin, AN ;

Tsidilkovski, VI ;

Kurumchin, EK .

SOLID STATE IONICS, 1996, 84 (1-2) :105-112

[7] The types of surface exchange and diffusion of oxygen in La0.7Sr0.3CoO3-δ [J].

Ezin, AN ;

Kurumchin, EK ;

Murygin, IV ;

Tsidilkovski, VI ;

Vdovin, GK .

SOLID STATE IONICS, 1998, 112 (1-2) :117-122

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

Figueiredo, FM ;

Marques, FMB ;

Frade, JR .

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

[9] Surface exchange of oxygen in mixed conducting perovskite oxides [J].

Kilner, JA ;

DeSouza, RA ;

Fullarton, IC .

SOLID STATE IONICS, 1996, 86-8 :703-709

[10] THEORY OF EXCHANGE REACTIONS BETWEEN FLUIDS AND SOLIDS WITH TRACER DIFFUSION IN SOLID [J].

KLIER, K ;

KUCERA, E .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1966, 27 (6-7) :1087-&

← 1 2 →