Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/20902
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dc.contributor.authorZakharchuk, Kirylpt
dc.contributor.authorKravchenko, Ekaterinapt
dc.contributor.authorFagg, Duncan P.pt
dc.contributor.authorFrade, Jorge R.pt
dc.contributor.authorYaremchenko, Aleksey A.pt
dc.date.accessioned2017-12-07T20:03:28Z-
dc.date.available2017-12-07T20:03:28Z-
dc.date.issued2016pt
dc.identifier.issn2046-2069pt
dc.identifier.urihttp://hdl.handle.net/10773/20902-
dc.description.abstractPhase relationships, transport properties and thermomechanical behavior of acceptor- and donor-co-substituted Gd2Ti2O7 were studied for possible application in solid oxide fuel cell anodes. The range of (Gd1-xCax)(2)(Ti1-yMoy)(2)O7-delta solid solutions with a cubic pyrochlore-type structure was found to be limited to 0.10 < x < 0.15 and 0.05 < y < 0.10 under oxidizing conditions. No evidence of phase instability of substituted materials was detected in the course of the electrical and thermogravimetric studies down to oxygen partial pressures as low as 10(-19) atm at 950 degrees C. (Gd1-xCax)(2)(Ti1-yMoy)(2)O7-delta ceramics possess moderate thermal expansion coefficients compatible with solid electrolytes, (10.5-10.7) x 10(-6) K-1 at 25-1100 degrees C in air, and demonstrate remarkable dimensional stability with nearly zero chemical expansion down to p(O-2) x 10(-1)2 atm at 950 degrees C. Though co-substitution by Mo suppresses oxygen-ionic conduction under oxidizing conditions, reducing oxygen partial pressure increases both ionic and n-type electronic transport. (Gd1-xCax)(2)(Ti0.95Mo0.05)(2)O7-delta (x = 0.07-0.10) pyrochlores are mixed conductors under SOFC anode operation conditions, but comparatively low total conductivity limits its applicability as electrode materials.pt
dc.language.isoengpt
dc.publisherROYAL SOC CHEMISTRYpt
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147332/PTpt
dc.rightsopenAccesspor
dc.subjectOXIDE FUEL-CELLpt
dc.subjectELECTRICAL-PROPERTIESpt
dc.subjectOXYGENpt
dc.subjectANODEpt
dc.subjectTRANSPORTpt
dc.subjectDISORDERpt
dc.subjectSTABILITYpt
dc.subjectMIGRATIONpt
dc.subjectCERAMICSpt
dc.subjectDOPANTSpt
dc.titleMixed ionic-electronic conductivity and thermochemical expansion of Ca and Mo co-substituted pyrochlore-type Gd2Ti2O7pt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.firstPage70186pt
degois.publication.issue74pt
degois.publication.lastPage70196pt
degois.publication.titleRSC ADVANCESpt
degois.publication.volume6pt
dc.relation.publisherversion10.1039/c6ra14600gpt
dc.identifier.doi10.1039/c6ra14600gpt
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