Preparation and characterization of Pr1-xSrxMnO3+/-delta is (x=0, 0.15, 0.3, 0.4, 0.5) as a potential SOFC cathode material operating at intermediate temperatures (500-700 degrees C)

Kostogloudis, GC; Vasilakos, N; Ftikos, C

dc.contributor.author	Kostogloudis, GC	en
dc.contributor.author	Vasilakos, N	en
dc.contributor.author	Ftikos, C	en
dc.date.accessioned	2014-03-01T01:46:32Z
dc.date.available	2014-03-01T01:46:32Z
dc.date.issued	1997	en
dc.identifier.issn	0955-2219	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24932
dc.subject.classification	Materials Science, Ceramics	en
dc.subject.other	OXIDE FUEL-CELLS	en
dc.subject.other	DEFECT STRUCTURE	en
dc.subject.other	LANTHANUM MANGANITE	en
dc.subject.other	NONSTOICHIOMETRY	en
dc.subject.other	PEROVSKITES	en
dc.subject.other	ELECTRODES	en
dc.subject.other	CRYSTAL	en
dc.subject.other	POWDER	en
dc.title	Preparation and characterization of Pr1-xSrxMnO3+/-delta is (x=0, 0.15, 0.3, 0.4, 0.5) as a potential SOFC cathode material operating at intermediate temperatures (500-700 degrees C)	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	The crystal structure, thermal expansion and electrical conductivity of Sr-doped praseodymium manganites (Pr1-xSrxMnO3+/-delta where x=0, 0.15, 0.3, 0.4, 0.5) were studied in air, and their potential use as cathodes in intermediate temperature SOFCs was evaluated. All compositions have an orthorhombic perovskite-type structure (Pbnm space group). The lattice parameters were determined at room temperature by X-ray powder diffraction. The thermal expansion is almost linear for compositions with x greater than or equal to 0.15. The electrical conductivity can be described by the small polaron hopping conductivity model. The conductivity increases with temperature for all compositions. Both the thermal expansion coefficient (TEC) and the electrical conductivity increase with increasing Sr content, while the activation energy decreases. The low values of the calculated activation energies are in agreement with the small polaron hopping mechanism. Among the compositions studied, Pr0.5Sr0.5MnO3+/-delta, with a TEC value of 12.2 x 10(-6) cm (cm degrees C)(-1) and a conductivity value of 226 S cm(-1) at 500 degrees C, seems to be the most promissing material that can function as cathode in the intermediate temperature SOFC. (C) 1997 Elsevier Science Limited.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	JOURNAL OF THE EUROPEAN CERAMIC SOCIETY	en
dc.identifier.isi	ISI:A1997YE87800014	en
dc.identifier.volume	17	en
dc.identifier.issue	12	en
dc.identifier.spage	1513	en
dc.identifier.epage	1521	en