An evaluation of Ce-Pr oxides and Ce-Pr-Nb oxides mixed conductors for cathodes of solid oxide fuel cells: Structure, thermal expansion and electrical conductivity

Nauer, M; Ftikos, C; Steele, BCH

dc.contributor.author	Nauer, M	en
dc.contributor.author	Ftikos, C	en
dc.contributor.author	Steele, BCH	en
dc.date.accessioned	2014-03-01T01:09:43Z
dc.date.available	2014-03-01T01:09:43Z
dc.date.issued	1994	en
dc.identifier.issn	09552219	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11153
dc.subject	Electric Conductivity	en
dc.subject	Solid Oxide Fuel Cell	en
dc.subject	Thermal Expansion	en
dc.subject.other	Addition reactions	en
dc.subject.other	Cathodes	en
dc.subject.other	Composition effects	en
dc.subject.other	Conductive materials	en
dc.subject.other	Electric conductivity measurement	en
dc.subject.other	Fuel cells	en
dc.subject.other	Niobium compounds	en
dc.subject.other	Praseodymium compounds	en
dc.subject.other	Spectroscopy	en
dc.subject.other	Thermal effects	en
dc.subject.other	Thermal expansion	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Complex impedance spectroscopy	en
dc.subject.other	Four probe DC technique	en
dc.subject.other	Lattice parameters	en
dc.subject.other	Cerium compounds	en
dc.title	An evaluation of Ce-Pr oxides and Ce-Pr-Nb oxides mixed conductors for cathodes of solid oxide fuel cells: Structure, thermal expansion and electrical conductivity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0955-2219(94)90118-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0955-2219(94)90118-X	en
heal.publicationDate	1994	en
heal.abstract	Ceria doped with praseodymia and niobia has been studied in order to evaluate the possibility of applying these materials as cathodes for solid oxide fuel cells. The content of crystallographic phases and their lattice parameters have been determined by X-ray diffraction, the thermal expansion coefficient has been characterised by the dilatometry technique and the electrical conductivity has been measured by complex impedance spectroscopy and by the four probe DC technique. The results have shown the presence of one fluorite phase in binary compositions (CeO2-PrO2-x) for PrO2-x concentrations up to about 20 mol% and two fluorite phases with different lattice parameters for higher PrO2-x concentrations. The addition of 3 mol% NbO2·5 has allowed the stabilisation of a single fluorite phase up to 50 mol% PrO2-x. The thermal expansion coefficient varies between 0 and 30 × 10-6/K depending on composition and temperature. The electrical conductivity is mainly electronic and thermally activated. The conductivity exceeds 0·1 S/cm at 800°C for compositions with 40 to 50 mol% PrO2-x. © 1994.	en
heal.journalName	Journal of the European Ceramic Society	en
dc.identifier.doi	10.1016/0955-2219(94)90118-X	en
dc.identifier.volume	14	en
dc.identifier.issue	6	en
dc.identifier.spage	493	en
dc.identifier.epage	499	en