Structural refinement and photoluminescence properties of irregular cube-like (Ca-1_Cu-x(x))TiO3 microcrystals synthesized by the microwave-hydrothermal method

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dc.contributor.authorOliveira, L. H.
dc.contributor.authorde Moura, A. P. [UNESP]
dc.contributor.authorMazzo, T. M. [UNESP]
dc.contributor.authorRamirez, M. A. [UNESP]
dc.contributor.authorCavalcante, L. S. [UNESP]
dc.contributor.authorAntonio, S. G. [UNESP]
dc.contributor.authorAvansi, W. [UNESP]
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:30:55Z
dc.date.available2014-05-20T15:30:55Z
dc.date.issued2012-09-14
dc.description.abstractIn this paper, calcium copper titanate (Ca-1_Cu-x(x))TiO3 microcrystals with (x = 0, 0.01 and 0.02) were synthesized by the microwave-hydrothermal method at 140 degrees C for 30 min. These crystals were analyzed by X-ray diffraction (XRD), Rietveld refinement, X-ray absorption near-edge structure spectroscopy (XANES), micro-Raman spectroscopy, field emission scanning electron microscopy (FE-SEM). Its optical properties were investigated by ultraviolet-visible (UV-vis) absorption and photoluminescence (PL) measurements. XRD patterns, Rietveld refinement and micro-Raman spectroscopy indicated that these crystals present a perovskite-type orthorhombic structure. The Rietveld refinement data, micro-Raman and XANES spectra suggested that the substitution of Ca by Cu in A-site promoted a displacement of Ti atoms to off-center symmetric, which leads distortions on the cuboctahedral [CaO12] clusters neighboring and consequently promotes a strain into the CaTiO3 lattice. FE-SEM images showed that these cube-like microcrystals have an irregular shape due to Ostwald-ripening and self-assembly of plates and cubes in growth process. The defects and distortions into lattice at medium- and short-range on the[CaO12]/[TiO6]clusters promotes the structural order-disorder responsible by the intense PL properties of these microcrystals. The microcrystals are promising candidates for future applications in optical devices. (C) 2012 Elsevier B.V. All rights reserved.en
dc.description.affiliationDQ UFSCar Universidade Federal de São Carlos (UFSCar), BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUNESP Univ Estadual Paulista, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationUNESP Univ Estadual Paulista, BR-12516410 Guaratingueta, SP, Brazil
dc.description.affiliationIFSC USP, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP Univ Estadual Paulista, BR-12516410 Guaratingueta, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 143455/2008-7
dc.description.sponsorshipIdCNPq: 159710/2011-1
dc.format.extent130-139
dc.identifierhttp://dx.doi.org/10.1016/j.matchemphys.2012.06.042
dc.identifier.citationMaterials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 136, n. 1, p. 130-139, 2012.
dc.identifier.doi10.1016/j.matchemphys.2012.06.042
dc.identifier.issn0254-0584
dc.identifier.urihttp://hdl.handle.net/11449/40203
dc.identifier.wosWOS:000309334300017
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.titleStructural refinement and photoluminescence properties of irregular cube-like (Ca-1_Cu-x(x))TiO3 microcrystals synthesized by the microwave-hydrothermal methoden
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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