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Titolo:
Electronic conductivity of ZrO2-CeO2-YO1.5 solid solutions
Autore:
Xiong, YP; Yamaji, K; Sakai, N; Negishi, H; Horita, T; Yokokawa, H;
Indirizzi:
Natl Inst Adv Ind Sci & Technol, Energy Elect Inst, Tsukuba, Ibaraki 3058565, Japan Natl Inst Adv Ind Sci & Technol Tsukuba Ibaraki Japan 3058565 8565, Japan
Titolo Testata:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
fascicolo: 12, volume: 148, anno: 2001,
pagine: E489 - E492
SICI:
0013-4651(200112)148:12<E489:ECOZSS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Xiong, YP Natl Inst Adv Ind Sci & Technol, Energy Elect Inst, Tsukuba, Ibaraki 3058565, Japan Natl Inst Adv Ind Sci & Technol Tsukuba Ibaraki Japan 3058565 n
Citazione:
Y.P. Xiong et al., "Electronic conductivity of ZrO2-CeO2-YO1.5 solid solutions", J ELCHEM SO, 148(12), 2001, pp. E489-E492

Abstract

The temperature and the oxygen partial pressure dependencies of the electronic conductivity of [(ZrO2)(1-x)(CeO2)(x)](0.8)(YO1.5)(0.2) (x = 0-1, 0.1 step) solid solutions were measured by dc polarization using a Hebb-Wagner's ion-blocking cell. The main charge carrier was electron for ceria-containing compositions (x greater than or equal to 0.1) in a whole range of measured oxygen partial pressure [log(p(O2)/Pa) = -6 to 3]. With increasing CeO2concentration, the electronic conductivity drastically increased for x = 0-0.5, slightly decreased for x = 0.5-1.0, and showed a maximum at x = 0.5. The electronic conductivity is proportional to p(O2)(-1/4) at the higher oxygen partial pressures and p(O2)(-1/m) (m > 4) at the lower oxygen partial pressures. It is suggested that Ce4+ ions in ZrO2-CeO2-YO1.5 solid solutions with low CeO2 concentration were reduced more easily. The compositional dependence of the electronic conductivity can be explained by the reduction of Ce4+ to Ce3+ and the stabilization of Ce3+ ion in the [(ZrO2)(1-x)(CeO2)(x)](0.8)(YO1.5)(0.2) structure. (C) 2001 The Electrochemical Society.

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Documento generato il 11/07/20 alle ore 10:27:13