Crystal structure, thermal and electrical properties of Pr1-xSrxCoO3-δ (x = 0, 0.15, 0.3, 0.4, 0.5) perovskite oxides

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	2014-03-01T01:13:39Z
dc.date.available	2014-03-01T01:13:39Z
dc.date.issued	1998	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12637
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0000162723&partnerID=40&md5=c05c228fd1d8c36df6f869faf14f9641	en
dc.subject	Crystal structure	en
dc.subject	Electrical conductivity	en
dc.subject	Metal-insulator transition	en
dc.subject	Strontium-doped praseodymium cobaltite	en
dc.subject	Thermal expansion	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	TRANSITION-METAL COMPOUNDS	en
dc.subject.other	MAGNETIC-PROPERTIES	en
dc.subject.other	BAND-GAPS	en
dc.subject.other	NONSTOICHIOMETRY	en
dc.subject.other	LA1-XSRXCOO3	en
dc.subject.other	ELECTRODES	en
dc.subject.other	SYSTEM	en
dc.title	Crystal structure, thermal and electrical properties of Pr1-xSrxCoO3-δ (x = 0, 0.15, 0.3, 0.4, 0.5) perovskite oxides	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	The crystal structure at room temperature, and the thermal expansion and electrical conductivity, from room temperature up to 800 degrees C, of the perovskite-type oxides in the system Pr(1-x)Sr(x)CoO3-delta (x = 0, 0.15, 0.3, 0.4, 0.5) were studied. All compounds have the orthorhombic perovskite GdFeO3-type structure (Pbnm space group). The lattice parameters were determined by X-ray powder diffraction. The introduction of Sr2+ into the lattice is compensated by the oxidation of Co3+ to form Co4+ (holes) for low x, and at reduced temperatures on higher x values, or by the formation of oxygen vacancies as x increases and at high temperatures. Above x = 0.4 oxygen vacancies are formed even at room temperature. The thermal expansion is almost linear for x greater than or equal to 0.15. The thermal expansion coefficient (TEC), determined in the temperature range from room temperature to 500 degrees C, decreases with x, but shows an increase above x = 0.4. The electrical conductivity increases with x, but when x greater than or equal to 0.4 it decreases. The conductivity of the undoped sample in the examined temperature range, and that of x = 0.15 up to 500 degrees C is p-type semiconducting, and can be described by the small polaron hopping mechanism. Semi-metallic behavior was observed for x = 0.15 above 500 degrees C and for x greater than or equal to 0.3 in the whole examined temperature range. The metal-insulator (M-I) transition at room temperature occurs at approximately x = 0.25.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Solid State Ionics	en
dc.identifier.isi	ISI:000072411600004	en
dc.identifier.volume	106	en
dc.identifier.issue	3-4	en
dc.identifier.spage	207	en
dc.identifier.epage	218	en