Martin, Manfred (1999)
Cation demixing in an oxygen ion conductor exposed to an oxygen potential gradient.
Sixth International Symposium on Solid Oxide Fuel Cells (SOFC-VI). Honolulu, Hawaii (17.10.1999-22.10.1999)
doi: 10.1149/199919.0308PV
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
This paper gives a formal analysis of cation demixing in an oxygen ion conductor AO2(+B2O3) which is exposed to an oxygen potential gradient and an electronic short-circuit (SOFC conditions). The formal treatment shows that the dopant B becomes enriched at the high oxygen potential side if 3DB>4DA, while depletion in B occurs at this side for 3DB<4DA. Even small differences in the diffusion coefficients cause appreciable demixing and strongly asymmetric demixing profiles. The paper also discusses the conditions under which demixing might be relevant for applications, e.g. as a long term degradation mechanism.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 1999 |
| Autor(en): | Martin, Manfred |
| Art des Eintrags: | Bibliographie |
| Titel: | Cation demixing in an oxygen ion conductor exposed to an oxygen potential gradient |
| Sprache: | Deutsch |
| Publikationsjahr: | 1999 |
| Ort: | Bristol ; Philadelphia, PA |
| Verlag: | IOP Publishing |
| Reihe: | ECS proceedings volumes |
| Band einer Reihe: | 99-19 |
| Veranstaltungstitel: | Sixth International Symposium on Solid Oxide Fuel Cells (SOFC-VI) |
| Veranstaltungsort: | Honolulu, Hawaii |
| Veranstaltungsdatum: | 17.10.1999-22.10.1999 |
| DOI: | 10.1149/199919.0308PV |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | This paper gives a formal analysis of cation demixing in an oxygen ion conductor AO2(+B2O3) which is exposed to an oxygen potential gradient and an electronic short-circuit (SOFC conditions). The formal treatment shows that the dopant B becomes enriched at the high oxygen potential side if 3DB>4DA, while depletion in B occurs at this side for 3DB<4DA. Even small differences in the diffusion coefficients cause appreciable demixing and strongly asymmetric demixing profiles. The paper also discusses the conditions under which demixing might be relevant for applications, e.g. as a long term degradation mechanism. |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie |
| Hinterlegungsdatum: | 19 Nov 2008 16:03 |
| Letzte Änderung: | 25 Sep 2024 11:04 |
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