Photoluminescence behavior in MgTiO3 powders with vacancy/distorted clusters and octahedral tilting

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dc.contributor.authorFerri, E. A. V.
dc.contributor.authorSczancoski, J. C.
dc.contributor.authorCavalcante, L. S.
dc.contributor.authorParis, E. C.
dc.contributor.authorEspinosa, J. W. M. [UNESP]
dc.contributor.authorde Figueiredo, A. T. [UNESP]
dc.contributor.authorPizani, P. S.
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:33:16Z
dc.date.available2014-05-20T15:33:16Z
dc.date.issued2009-09-15
dc.description.abstractMgTiO3 powders were prepared by the complex polymerization method and heat treated at different temperatures for 2 h. These powders were analyzed by X-ray diffraction (XRD), Rietveld refinements, micro-Raman (MR) spectroscopy, X-ray absorption near edge spectroscopy (XANES), ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectra showed that the crystalline powders have a rhombohedral structure. XANES spectra indicated that the local structure of crystalline MgTiO3 powders is composed only by [TiO6] clusters, while the disordered exhibit the simultaneous presence of both [TiO5]and [TiO6] complex clusters into the lattice. UV-vis spectra revealed different optical band gap values as a function of heat treatment temperature. This result can be an indicative of intermediary energy levels within the band gap of this material because of structural defects into the perovskite-type structure. PL behavior was attributed to the structural order-disorder and/or distortions on the [TiO6]-[TiO6] complex clusters. (c) 2009 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, LIEC IQ, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationIFSC USP, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, LIEC IQ, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipEAPESP
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)
dc.description.sponsorshipIdLNLS: D04B - XAFS1 - 8050
dc.format.extent192-198
dc.identifierhttp://dx.doi.org/10.1016/j.matchemphys.2009.05.042
dc.identifier.citationMaterials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 117, n. 1, p. 192-198, 2009.
dc.identifier.doi10.1016/j.matchemphys.2009.05.042
dc.identifier.issn0254-0584
dc.identifier.urihttp://hdl.handle.net/11449/41948
dc.identifier.wosWOS:000269291500036
dc.language.isoeng
dc.publisherElsevier B.V. Sa
dc.relation.ispartofMaterials Chemistry and Physics
dc.relation.ispartofjcr2.210
dc.relation.ispartofsjr0,615
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectOptical materialsen
dc.subjectChemical synthesisen
dc.subjectXAFSen
dc.subjectLuminescenceen
dc.titlePhotoluminescence behavior in MgTiO3 powders with vacancy/distorted clusters and octahedral tiltingen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V. Sa
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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