Oxygen diffusion and surface exchange studies on (La0.75Sr0.25)0.95Cr0.51Mn0.5O3-δ

被引：50

作者：

Raj, Edwin S. ^{[1
]}

Kilner, John A.

Irvine, John T. S.

机构：

[1] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England

来源：

SOLID STATE IONICS | 2006年 / 177卷 / 19-25期

基金：

英国工程与自然科学研究理事会;

关键词：

oxygen diffusion; surface exchange; SIMS; IEDP; LSCM;

D O I：

10.1016/j.ssi.2006.04.011

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：

Oxygen tracer diffusion coefficient (D*) and surface exchange coefficient (k*) have been measured for (La0.75Sr0.25)(0.95-)Cr0.5Mn0.5O3-delta using isotopic exchange and depth profiling by secondary ion mass spectrometry technique as a function of temperature (700-1000 degrees C) in dry oxygen and in a water vapour-forming gas mixture. The typical values of D* under oxidising and reducing conditions at similar to 1000 degrees C are 4 x 10(-10) cm(2) s(-1) and 3 x 10(-8) cm(2) s(-1) respectively, whereas the values of k* under oxidising and reducing conditions at 1000 degrees C are 5 x 10(-8) cm s(-1) and 4 x 10(-8) cm s(-1) respectively. The apparent activation energies for D* in oxidising and reducing conditions are 0.8 eV and 1.9 eV respectively. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1747 / 1752

页数：6

共 22 条

[1] Advanced anodes for high-temperature fuel cells [J].

Atkinson, A ;

Barnett, S ;

Gorte, RJ ;

Irvine, JTS ;

Mcevoy, AJ ;

Mogensen, M ;

Singhal, SC ;

Vohs, J .

NATURE MATERIALS, 2004, 3 (01) :17-27

[2] Oxygen diffusion and surface exchange in La0.8Sr0.2Fe0.8Cr0.2O3-δ under reducing conditions [J].

Atkinson, A ;

Chater, RJ ;

Rudkin, R .

SOLID STATE IONICS, 2001, 139 (3-4) :233-240

[3] Degradation of La0.6Sr0.4Fe0.8Co0.2O3-δ in carbon dioxide and water atmospheres [J].

Benson, SJ ;

Waller, D ;

Kilner, JA .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1999, 146 (04) :1305-1309

[4] THE OXYGEN-TRANSFER PROCESS ON SOLID OXIDE NOBLE-METAL ELECTRODES, STUDIED WITH IMPEDANCE SPECTROSCOPY, DC POLARIZATION AND ISOTOPE-EXCHANGE [J].

BOUKAMP, BA ;

VANHASSEL, BA ;

VINKE, IC ;

DEVRIES, KJ ;

BURGGRAAF, AJ .

ELECTROCHIMICA ACTA, 1993, 38 (14) :1817-1825

[5] OXYGEN-TRANSPORT IN SELECTED NONSTOICHIOMETRIC PEROVSKITE-STRUCTURE OXIDES [J].

CARTER, S ;

SELCUK, A ;

CHATER, RJ ;

KAJDA, J ;

KILNER, JA ;

STEELE, BCH .

SOLID STATE IONICS, 1992, 53 :597-605

[6] DEVELOPMENT OF A NOVEL SIMS TECHNIQUE FOR OXYGEN SELF-DIFFUSION AND SURFACE EXCHANGE COEFFICIENT MEASUREMENTS IN OXIDES OF HIGH DIFFUSIVITY [J].

CHATER, RJ ;

CARTER, S ;

KILNER, JA ;

STEELE, BCH .

SOLID STATE IONICS, 1992, 53 (pt 2) :859-867

[7]

Crank J., 1975, MATH DIFFUSION, P36

[8] Oxygen transport in La1-xSrxMn1-yCoyO3±δ perovskites -: Part I.: Oxygen tracer diffusion [J].

De Souza, RA ;

Kilner, JA .

SOLID STATE IONICS, 1998, 106 (3-4) :175-187

[9] A SIMS study of oxygen tracer diffusion and surface exchange in La0.8Sr0.2MnO3+δ [J].

De Souza, RA ;

Kilner, JA ;

Walker, JF .

MATERIALS LETTERS, 2000, 43 (1-2) :43-52

[10]

Horita T, 1998, ELECTROCHEM SOLID ST, V1, P4, DOI 10.1149/1.1390616

← 1 2 3 →