Electronic conductivity in the Pr1-xSrxCo1-yMnyO 3-δ system

Kostogloudis, GC; Fertis, P; Ftikos, C

dc.contributor.author	Kostogloudis, GC	en
dc.contributor.author	Fertis, P	en
dc.contributor.author	Ftikos, C	en
dc.date.accessioned	2014-03-01T01:14:34Z
dc.date.available	2014-03-01T01:14:34Z
dc.date.issued	1999	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13154
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0033514795&partnerID=40&md5=32ab0787eff21d73055e593af24da3d8	en
dc.subject	Electronic conductivity	en
dc.subject	Perovskite	en
dc.subject	Polaron trapping	en
dc.subject	Praseodymium cobaltite	en
dc.subject	Praseodymium manganite	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Activation energy	en
dc.subject.other	Composition effects	en
dc.subject.other	Doping (additives)	en
dc.subject.other	Electric conductivity measurement	en
dc.subject.other	Lattice constants	en
dc.subject.other	Manganese	en
dc.subject.other	Mathematical models	en
dc.subject.other	Perovskite	en
dc.subject.other	Semiconductor materials	en
dc.subject.other	X ray crystallography	en
dc.subject.other	Polaron hopping conductivity model	en
dc.subject.other	Praseodymium cobaltite	en
dc.subject.other	Praseodymium manganite	en
dc.subject.other	Praseodymium compounds	en
dc.title	Electronic conductivity in the Pr1-xSrxCo1-yMnyO 3-δ system	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	The effect of Mn substitution for Co and of Sr doping for Pr on the electronic conductivity of Pr1-xSr1-yCo1-yMnyO3-delta (x = 0.3, 0.5, 0 less than or equal to y less than or equal to 1) was investigated. All oxides have an orthorhombic GdFeO3-type structure (space group Pbnm), as determined by XRD. The pseudo-cubic lattice constant increases with increasing Mn content. The electrical conductivity was measured in the temperature range from 100 to 800 degrees C in air. The substitutionally-mixed compositions exhibit a semiconducting behavior, where the small polaron hopping conductivity model applies. The normalized conductivity shows a sharp decrease when y increases in the range 0 < y < 0.4, and it reaches a minimum in the range 0.4 < y < 0.6. The small polaron is trapped at the energetically lower Mn sites, and the slow transition rate to a neighboring Co site dominates the hopping process. At higher y values, the hopping proceeds among adjacent Mn sites, and as a result, an increase of conductivity is observed. The calculated activation energy values agree with the above mechanism. (C) 1999 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Solid State Ionics	en
dc.identifier.isi	ISI:000079046100007	en
dc.identifier.volume	118	en
dc.identifier.issue	3-4	en
dc.identifier.spage	241	en
dc.identifier.epage	249	en