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Titolo:
Oxygen surface exchange of Y0.2Ce0.8O2-x under reducing atmosphere
Autore:
Horita, T; Yamaji, K; Sakai, N; Ishikawa, M; Yokokawa, H; Kawada, T; Dokiya, M;
Indirizzi:
Natl Inst Mat & Chem Res, Ibaraki, Osaka 305, Japan Natl Inst Mat & Chem Res Ibaraki Osaka Japan 305 baraki, Osaka 305, Japan Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi 980, Japan Tohoku Univ Sendai Miyagi Japan 980 s Res Inst, Sendai, Miyagi 980, Japan Yokohamapantl Univ, Inst Environm Sci & Technol, Yokohama, Kanagawa 240, Ja Yokohama Natl Univ Yokohama Kanagawa Japan 240 Yokohama, Kanagawa 240, Ja
Titolo Testata:
ELECTROCHEMICAL AND SOLID STATE LETTERS
fascicolo: 1, volume: 1, anno: 1998,
pagine: 4 - 6
SICI:
1099-0062(199807)1:1<4:OSEOYU>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDE FUEL-CELLS; IONIC-CONDUCTIVITY; CERIA; TRANSPORT; ELECTROLYTES; ZIRCONIA; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Horita, T Natl Inst Mat & Chem Res, 1-1 Higashi, Ibaraki, Osaka 305, JapanNatl Inst Mat & Chem Res 1-1 Higashi Ibaraki Osaka Japan 305 pan
Citazione:
T. Horita et al., "Oxygen surface exchange of Y0.2Ce0.8O2-x under reducing atmosphere", EL SOLID ST, 1(1), 1998, pp. 4-6

Abstract

Oxygen surface exchange was measured for Y0.2Ce0.8O2-x (YDC) and Y(0.1)5Zr(0.85)O(2-y) (YSZ) over a wide range of oxygen partial pressures (7.3 X 10(-21) to 0.17 bar) by isotope oxygen exchange (O-18/O-16) using secondary-ion mass spectrometry analysis at 973 K. Diffusion depth profiles of O-18 in YDC and YSZ were analyzed by an appropriate fitting equation to calculate diffusion coefficient (D) and surface exchange coefficient (k). The diffusion coefficients (D) for YDC and YSZ are consistent with the reference data. The k values for both materials were similar (about k = 5-9 X 10(-8) cm s(-1)) at the same temperatures. The k value increases with decreasing oxygen partial pressure for both YDC and YSZ. A relationship between the k value and the concentrations of electron and oxygen vacancy is discussed. (C) 1998The Electrochemical Society, Inc. S1099-0062(97)12-036-3.

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Documento generato il 29/09/20 alle ore 20:30:04