Effect of the tantalum oxide addition in the phase composition and electrical conductivity in the zirconium-10% mol Scandia

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dc.contributor.authorSOUZA, J.P.pt_BR
dc.contributor.authorMUCCILLO, E.N.S.pt_BR
dc.coverageInternacionalpt_BR
dc.creator.eventoELECTROCERAMICS, 16thpt_BR
dc.date.accessioned2019-10-08T19:13:47Z
dc.date.available2019-10-08T19:13:47Z
dc.date.eventoJuly 9-12, 2018pt_BR
dc.description.abstractScandia-stabilized zirconia (ScSZ) based compositions are alternative electrolyte systems to the conventional yttria stabilized zirconia (YSZ) for solid oxide fuel cells (SOFCs) operating at intermediate temperatures (500-700 °C). ScSZ exhibits higher ionic conductivity (~10 mS.cm-1) than YSZ and has a high ionic transference number (~1.0) under reducing conditions. However, the cubicrhombohedral phase transition at ~600ºC causes a considerable decrease in ionic conductivity, hindering its use in technological applications. The introduction of a second additive promotes the stabilization of the cubic phase at room temperature and suppresses the deleterious phase transition. In this work the effect of the addition of small amounts (up to 0.50 mol%) of tantalum oxide in the phase composition and in the electrical conductivity of the zirconia-10% mol scandia is investigated. Double doping samples were prepared by the conventional mixing method followed by solid state reaction. The compacts obtained by uniaxial pressing were sintered in air at 1500ºC for 5 h. Samples containing at least 0.40 mol% of additive showed stabilization of the cubic phase at room temperature. The impedance spectroscopy results showed an increase in grain conductivity for compositions containing at least 0.35 mol% tantalum oxide. These results show that it is possible to use tantalum oxide in small amounts to suppress the cubic-rhombohedral phase transition, and to increase the zirconia-scandia electrical conductivity at low temperatures.pt_BR
dc.identifier.citationSOUZA, J.P.; MUCCILLO, E.N.S. Effect of the tantalum oxide addition in the phase composition and electrical conductivity in the zirconium-10% mol Scandia. In: ELECTROCERAMICS, 16th, July 9-12, 2018, Hasselt, Belgium. <b>Proceedings...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/30203.
dc.identifier.orcid0000-0001-9219-388Xpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-9219-388X
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/30203
dc.local.eventoHasselt, Belgiumpt_BR
dc.rightsopenAccesspt_BR
dc.subjectzirconium
dc.subjectadditives
dc.subjectphase transformations
dc.subjectsolid electrolytes
dc.subjectscandium
dc.titleEffect of the tantalum oxide addition in the phase composition and electrical conductivity in the zirconium-10% mol Scandiapt_BR
dc.typeTexto completo de eventopt_BR
dspace.entity.typePublication
ipen.autorELIANA NAVARRO DOS SANTOS MUCCILLO
ipen.autorJULIANA PEREIRA DE SOUZA
ipen.codigoautor1298
ipen.codigoautor8778
ipen.contributor.ipenauthorELIANA NAVARRO DOS SANTOS MUCCILLO
ipen.contributor.ipenauthorJULIANA PEREIRA DE SOUZA
ipen.date.recebimento19-10
ipen.event.datapadronizada2018pt_BR
ipen.identifier.ipendoc25994pt_BR
ipen.notas.internasProceedingspt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublicationbc09f7ae-f25e-4f60-87a3-0c89989e8304
relation.isAuthorOfPublicationc0133a33-0641-4ced-8a20-cf00e8be898f
relation.isAuthorOfPublication.latestForDiscoveryc0133a33-0641-4ced-8a20-cf00e8be898f
sigepi.autor.atividadeMUCCILLO, E.N.S.:1298:720:Npt_BR
sigepi.autor.atividadeSOUZA, J.P.:8778:720:Spt_BR
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