Structural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystals

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dc.contributor.authorBomio, M. R D
dc.contributor.authorCavalcante, L. S. [UNESP]
dc.contributor.authorAlmeida, M. A P
dc.contributor.authorTranquilin, R. L.
dc.contributor.authorBatista, N. C.
dc.contributor.authorPizani, P. S.
dc.contributor.authorSiu Li, M.
dc.contributor.authorAndres, J.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)
dc.contributor.institutionUniversidade Estadual do Piauí (UESPI)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversitat Jaume I
dc.date.accessioned2014-05-27T11:28:27Z
dc.date.available2014-05-27T11:28:27Z
dc.date.issued2013-02-13
dc.description.abstractLead molybdate (PbMoO4) crystals were synthesized by the co-precipitation method at room temperature and then processed in a conventional hydrothermal (CH) system at low temperature (70 °C for different times). These crystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman (MR) and Fourier transformed infrared (FT-IR) spectroscopies. Field emission scanning electron microscopy images were employed to observe the shape and monitor the crystal growth process. The optical properties were investigated by ultraviolet-visible (UV-Vis) absorption and photoluminescence (PL) measurements. XRD patterns and MR spectra indicate that these crystals have a scheelite-type tetragonal structure. Rietveld refinement data possibilities the evaluation of distortions in the tetrahedral [MoO 4] clusters. MR and FT-IR spectra exhibited a high mode ν1(Ag) ascribed to symmetric stretching vibrations as well as a large absorption band with two modes ν3(Eu and Au) related to anti-symmetric stretching vibrations in [MoO 4] clusters. Growth mechanisms were proposed to explain the stages involved for the formation of octahedron-like PbMoO4 crystals. UV-Vis absorption spectra indicate a reduction in optical band gap with an increase in the CH processing time. PL properties of PbMoO4 crystals have been elucidated using a model based on distortions of tetrahedral [MoO4] clusters due to medium-range intrinsic defects and intermediary energy levels (deep and shallow holes) within the band gap. © 2012 Elsevier Ltd. All rights reserved.en
dc.description.affiliationDEMat Universidade Federal Do Rio Grande Do Norte, P.O. Box 1524, 59078-970 Natal, RN
dc.description.affiliationUESPI-CCN Departamento de Química, Rua João Cabral, 64002-150 Teresina, PI
dc.description.affiliationLIEC Universidade Estadual Paulista, P.O. Box 355, 14801-907 Araraquara, SP
dc.description.affiliationDQ-DF-UFSCar Universidade Federal de São Carlos, P.O. Box 676, 13565-905 São Carlos, SP
dc.description.affiliationIFSC-Universidade de São Paulo, P.O. Box 369, 13560-970 São Carlos, SP
dc.description.affiliationDepartamento de Química Física y Analítica Universitat Jaume I, 12071 Castello
dc.description.affiliationUnespLIEC Universidade Estadual Paulista, P.O. Box 355, 14801-907 Araraquara, SP
dc.format.extent532-545
dc.identifierhttp://dx.doi.org/10.1016/j.poly.2012.12.001
dc.identifier.citationPolyhedron, v. 50, n. 1, p. 532-545, 2013.
dc.identifier.doi10.1016/j.poly.2012.12.001
dc.identifier.issn0277-5387
dc.identifier.scopus2-s2.0-84871713504
dc.identifier.urihttp://hdl.handle.net/11449/74590
dc.identifier.wosWOS:000316033100068
dc.language.isoeng
dc.relation.ispartofPolyhedron
dc.relation.ispartofjcr2.067
dc.relation.ispartofsjr0,472
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectClusters
dc.subjectCrystal structure
dc.subjectLuminescence
dc.subjectPrecipitation
dc.subjectRaman
dc.titleStructural refinement, growth mechanism, infrared/Raman spectroscopies and photoluminescence properties of PbMoO4 crystalsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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