Preparation and characterization of Pr1-xSrxMnO3±δ (x = 0, 0·15, 0·3, 0·4, 0·5) as a potential SOFC cathode material operating at intermediate temperatures (500-700°C)

Kostogloudis, GCh; Vasilakos, N; Ftikos, Ch

dc.contributor.author	Kostogloudis, GCh	en
dc.contributor.author	Vasilakos, N	en
dc.contributor.author	Ftikos, Ch	en
dc.date.accessioned	2014-03-01T01:46:06Z
dc.date.available	2014-03-01T01:46:06Z
dc.date.issued	1997	en
dc.identifier.issn	09552219	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24849
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-23744454181&partnerID=40&md5=fac9a591f8d3b7b957c8a4141506ed7c	en
dc.title	Preparation and characterization of Pr1-xSrxMnO3±δ (x = 0, 0·15, 0·3, 0·4, 0·5) as a potential SOFC cathode material operating at intermediate temperatures (500-700°C)	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	The crystal structure, thermal expansion and electrical conductivity of Sr-doped praseodymium manganites (Pr1-xSrxMnO3±δ 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≥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±δ, with a TEC value of 12·2 × 10-6cm (cm°C)-1 and a conductivity value of 226 S cm-1 at 500°C, seems to be the most promising material that can function as cathode in the intermediate temperature SOFC. © 1997 Elsevier Science Limited.	en
heal.journalName	Journal of the European Ceramic Society	en
dc.identifier.volume	17	en
dc.identifier.issue	12	en
dc.identifier.spage	1513	en
dc.identifier.epage	1521	en