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Titolo:
Determination of the oxygen permeation flux through La0.75Ca0.25CrO3-deltaby an electrochemical method
Autore:
Sakai, N; Yamaji, K; Horita, T; Yokokawa, H; Kawada, T; Dokiya, M; Hiwatashi, K; Ueno, A; Aizawa, M;
Indirizzi:
Natl Inst Mat & Chem Res, Ibaraki, Osaka 3058565, Japan Natl Inst Mat & Chem Res Ibaraki Osaka Japan 3058565 Osaka 3058565, Japan Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi 9808577, Japan Tohoku Univ Sendai Miyagi Japan 9808577 st, Sendai, Miyagi 9808577, Japan Yokohama,Natl Univ, Inst Environm Sci & Technol, Yokohama, Kanagawa 2400067 Yokohama Natl Univ Yokohama Kanagawa Japan 2400067 hama, Kanagawa 2400067 TOTO Ltd, Div Res & Dev, Kanagawa 2530042, Japan TOTO Ltd Kanagawa Japan2530042 , Div Res & Dev, Kanagawa 2530042, Japan
Titolo Testata:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
fascicolo: 4, volume: 146, anno: 1999,
pagine: 1341 - 1345
SICI:
0013-4651(199904)146:4<1341:DOTOPF>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOPED LANTHANUM CHROMITES; NONFLOWING ATMOSPHERES; FUGACITY CONTROL; DIFFUSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Sakai, N Natl Inst Mat & Chem Res, Ibaraki, Osaka 3058565, Japan Natl InstMat & Chem Res Ibaraki Osaka Japan 3058565 8565, Japan
Citazione:
N. Sakai et al., "Determination of the oxygen permeation flux through La0.75Ca0.25CrO3-deltaby an electrochemical method", J ELCHEM SO, 146(4), 1999, pp. 1341-1345

Abstract

The oxygen permeation flux measured as the oxide ion current density (J(o2-)) through La0.75Ca0.25CrO3-delta was determined at steady state by using an electrochemical method in the p(o2) range from 10(5) to 10(-11) Pa at T = 1273 K. The oxygen vacancy diffusion coefficient (D-v) is estimated to be1.5 x 10(-9) m(2) s(-1) in the p(o2) region from 1 to 10(-5) Pa. When p(o2) is lower than 10(-5) Pa, J(o2-) seems to depend on a surface reaction as the rate-determining step. The contribution of grain-boundary diffusion on permeation was considered in the oxidizing atmosphere. The oxygen permeation current density through a 1 mm thick plate is estimated as 0.03 A cm(-2) in the solid oxide fuel cell operation. (C) 1999 The Electrochemical Society. S0013-4651(98)07-071-2. All rights reserved.

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Documento generato il 29/09/20 alle ore 19:25:25