Rietveld refinement, cluster modelling, growth mechanism and photoluminescence properties of CaWO4: Eu3+ microcrystals

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dc.contributor.authorGoncalves, R. F.
dc.contributor.authorCavalcante, L. S.
dc.contributor.authorNogueira, I. C.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorGodinho, M. J. [UNESP]
dc.contributor.authorSczancoski, J. C. [UNESP]
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorPinatti, I. M.
dc.contributor.authorRosa, I. L. V.
dc.contributor.authorMarques, A. P. A.
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionInstituto Federal de Educação (IFMA)
dc.contributor.institutionUniversidade Estadual do Piauí (UEPI)Universidade Federal de Goiás (UFG)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2015-10-22T06:14:02Z
dc.date.available2015-10-22T06:14:02Z
dc.date.issued2015-01-01
dc.description.abstractCaWO4:Eu3+ microcrystals (with 0, 1, 2 and 4 mol% Eu3+) were synthesized by a co-precipitation (CP) method and grown in a microwave-assisted hydrothermal (MAH) system at 130 degrees C for 30 min. X-ray diffraction (XRD), Rietveld refinement, X-ray absorption near edge spectroscopy (XANES), Fourier-transform Raman (FT-Raman) and Fourier-transform infrared (FT-IR) spectroscopy indicated that all of the microcrystals have a scheelite-type tetragonal structure without deleterious phases. Structural refinement data were employed to model the [CaO8], [EuO8] and [WO4] clusters. XANES spectra confirmed that the presence of deltahedral [EuO8] clusters promotes small distortions of neighbouring tetrahedral [WO4] clusters in a global tetragonal lattice. Field emission scanning electron microcopy (FE-SEM) images revealed that the replacement of Ca2+ by Eu3+ ions changed the particles'shapes, resulting in the different morphologies of the microcrystals. UV-vis diffuse reflectance spectra indicated a reduction in the optical band gap with the replacement of Ca2+ by Eu3+ ions. The photoluminescence (PL) properties of the Eu3+ ions in CaWO4 were studied as well as the chromaticity coordinates and lifetimes of these compounds.en
dc.description.affiliationUNIFESP (Universidade Federal de São Paulo), Rua Prof. Artur Riedel, 275, Diadema, Brazil
dc.description.affiliationDepartamento de Química, UESPI, CCN, Rua João Cabral, P.O. Box 2231, Teresina-PI, Brazil
dc.description.affiliationIFMA (Instituto Federal de Educação), Ciência e Tecnologia do Maranhão, PPGEM, São Luís, Brazil
dc.description.affiliationDepartamento de Química, CAC/UFG (Universidade Federal de Goiás), Catalão, Brazil
dc.description.affiliationIFSC, Universidade de São Paulo, P.O. Box 369, São Carlos, Brazil
dc.description.affiliationCDMF-DQ, Universidade Federal de São Carlos, P.O. Box 676, 13565-905 São Carlos, Brazil
dc.description.affiliationUnespUniversidade Estadual Paulista, LIEC IQ, BR-14801907 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipNational Laboratory of Synchrotron Light
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.description.sponsorshipIdCNPq: 304531/2013-8
dc.description.sponsorshipIdNational Laboratory of Synchrotron Light: D04B-XAFS1-11883
dc.format.extent1654-1666
dc.identifierhttp://pubs.rsc.org/en/Content/ArticleLanding/2015/CE/C4CE02279C#!divAbstract
dc.identifier.citationCrystengcomm. Cambridge: Royal Soc Chemistry, v. 17, n. 7, p. 1654-1666, 2015.
dc.identifier.doi10.1039/c4ce02279c
dc.identifier.issn1466-8033
dc.identifier.urihttp://hdl.handle.net/11449/129603
dc.identifier.wosWOS:000349309700023
dc.language.isoeng
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofCrystengcomm
dc.relation.ispartofjcr3.304
dc.relation.ispartofsjr0,998
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleRietveld refinement, cluster modelling, growth mechanism and photoluminescence properties of CaWO4: Eu3+ microcrystalsen
dc.typeArtigo
dcterms.rightsHolderRoyal Soc Chemistry
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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