Crystal structure, thermal expansion and electrical conductivity of Pr1-xSrxCo0.2Fe0.8O3-delta (0 <= x <= 0.5)

Kostogloudis, GC; Ftikos, C

dc.contributor.author	Kostogloudis, GC	en
dc.contributor.author	Ftikos, C	en
dc.date.accessioned	2014-03-01T01:49:48Z
dc.date.available	2014-03-01T01:49:48Z
dc.date.issued	2000	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25931
dc.subject	perovskite oxides	en
dc.subject	SOFC cathodes	en
dc.subject	crystal structure	en
dc.subject	electrical conductivity	en
dc.subject	thermal expansion	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	PEROVSKITE OXIDE	en
dc.subject.other	CATHODE	en
dc.title	Crystal structure, thermal expansion and electrical conductivity of Pr1-xSrxCo0.2Fe0.8O3-delta (0 <= x <= 0.5)	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Perovskite oxides in the system Pr1-xSrxCo0.2Fe0.8O3-delta (0 less than or equal to x less than or equal to 0.5) were prepared and characterized. The crystal structure, thermal expansion and electrical conductivity of these oxides were studied by X-ray diffraction, dilatometry and 4-point DC, respectively. The structure of the oxides in the range 0 less than or equal to x less than or equal to 0.4 was orthorhombic (Pbnm space group) and became cubic for x = 0.5. The lattice parameters were determined. The thermal expansion coefficient (TEC) decreased for x = 0.1. and increased for higher x values. The slope of the thermal expansion curves increased and the electrical conductivity decreased at high temperatures, as a result of the loss of lattice oxygen and the formation of oxygen vacancies, a process which is enhanced as the Sr-doping level is increased. The composition Pr0.8Sr0.2Co0.2Fe0.8O3-delta showed the best performance, since its TEC and conductivity values at 700 degreesC (14X10(-6) cm (cm degreesC)(-1) and 159 S cm(-1), respectively), meet the requirements for application in SOFC cathodes. (C) 2000 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	SOLID STATE IONICS	en
dc.identifier.isi	ISI:000165856800075	en
dc.identifier.volume	135	en
dc.identifier.issue	1-4	en
dc.identifier.spage	537	en
dc.identifier.epage	541	en