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Intense blue and green photoluminescence emissions at room temperature in barium zirconate powders

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dc.contributor.authorCavalcante, L. S.
dc.contributor.authorSczancoski, J. C.
dc.contributor.authorEspinosa, J. W. M. [UNESP]
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorMichalowicz, A.
dc.contributor.authorPizani, P. S.
dc.contributor.authorVicente, Fábio Simões de [UNESP]
dc.contributor.authorLi, M. S.
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.contributor.institutionUniv Paris 12
dc.date.accessioned2013-09-30T18:50:57Z
dc.date.accessioned2014-05-20T14:16:40Z
dc.date.available2013-09-30T18:50:57Z
dc.date.available2014-05-20T14:16:40Z
dc.date.issued2009-03-05
dc.description.abstractIntense blue and green photoluminescence (PL) emissions were observed at room temperature in barium zirconate (BaZrO(3)) powders prepared by chemical method. The powders were analyzed by X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES), extended X-ray absorption spectroscopy (EXAFS) and ultraviolet-visible (UV-vis) absorption spectroscopy. The XRD patterns indicated the presence of a secondary phase of BaCO(3) in BaZrO(3) powders heat treated at 773K. K-edge XANES data revealed that Zr atoms presents in at least two Zr environments. EXAFS investigations showed strong bond length dispersion in the first coordination shell around Zr atoms. EXAFS analysis indicated that Zr atoms are coordinated by 6 oxygen in BaZrO(3) powders heat treated at 973 K. UV-vis measurements suggested the presence of intermediary energy levels into the band gap of BaZrO(3) powders heat treated at 773K. The intense PL emission in BaZrO(3) powders can be attributed to the two Zr environments or ZrO(5)-ZrO(6) clusters. (C) 2008 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Quim & Fis, BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUNESP, Inst Quim, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationUSP, Inst Fis São Carlos, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUniv Paris 12, Fac Sci & Technol, F-94010 Creteil, France
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801907 Araraquara, SP, Brazil
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.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)
dc.format.extent253-258
dc.identifierhttp://dx.doi.org/10.1016/j.jallcom.2008.03.080
dc.identifier.citationJournal of Alloys and Compounds. Lausanne: Elsevier B.V. Sa, v. 471, n. 1-2, p. 253-258, 2009.
dc.identifier.doi10.1016/j.jallcom.2008.03.080
dc.identifier.issn0925-8388
dc.identifier.lattes8408216349957378
dc.identifier.orcid0000-0001-7696-3004
dc.identifier.urihttp://hdl.handle.net/11449/25014
dc.identifier.wosWOS:000265086300063
dc.language.isoeng
dc.publisherElsevier B.V. Sa
dc.relation.ispartofJournal of Alloys and Compounds
dc.relation.ispartofjcr3.779
dc.relation.ispartofsjr1,020
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectDisordered systemsen
dc.subjectClustersen
dc.subjectChemical synthesisen
dc.subjectOrder-disorder effectsen
dc.subjectEXAFSen
dc.titleIntense blue and green photoluminescence emissions at room temperature in barium zirconate powdersen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V. Sa
dspace.entity.typePublication
unesp.author.lattes8408216349957378[7]
unesp.author.orcid0000-0001-7696-3004[7]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Geociências e Ciências Exatas, Rio Claropt
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísica - IGCEpt
unesp.departmentBioquímica e Tecnologia - IQARpt
unesp.departmentFísico-Química - IQARpt

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Rio Claro - IGCE - Instituto de Geociências e Ciências Exatas
Araraquara - IQAR - Instituto de Química