The influence of temperature on the color of TiO2:Cr pigments

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dc.contributor.authorGomes Vieira, Fagner Ticiano
dc.contributor.authorMelo, Danniely Silva
dc.contributor.authorGuedes de Lima, Severino Jackson
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorPaskocimas, Carlos Alberto
dc.contributor.authorSilva Junior, Wilson
dc.contributor.authorde Souza, Antonio Gouveia
dc.contributor.authorGarcia dos Santos, Ieda Maria
dc.contributor.institutionUniversidade Federal da Paraíba (UFPB)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:30:20Z
dc.date.available2014-05-20T15:30:20Z
dc.date.issued2009-05-06
dc.description.abstractTiO2:Cr brown pigments were prepared via a polymeric precursor derived from the Pechini method. The pigments were analyzed by infrared spectroscopy, X-ray diffraction, ultraviolet-vis spectroscopy, and colorimetry. The increase of the calcination temperature from 700 to 1000 degrees C led to a decrease in the L* values, corresponding to darkening of the pigments. The pigments obtained in this work are darker than those produced by a solid-state reaction method reported before. The change in the pigment color is due to the anatase-rutile phase transition, which leads to a shift in the charge transfer bond (Ti4+ - O2-) due to a change in the crystal field around the chromophore ions. Moreover, the oxidation state of chromium was observed to change, and this also alters the color of the pigments. (C) 2008 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniversidade Federal da Paraíba (UFPB), Ctr Ciencias Exatas & Nat, Dept Quim, LACOM, BR-58059900 Joao Pessoa, Paraiba, Brazil
dc.description.affiliationUniversidade Federal da Paraíba (UFPB), Dept Engn Mecan, LSR, BR-58059900 Joao Pessoa, Paraiba, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, CMDMC LIEC, Araraquara, SP, Brazil
dc.description.affiliationUniversidade Federal do Rio Grande do Norte (UFRN), Dept Engn Mecan, BR-59072970 Natal, RN, Brazil
dc.description.affiliationIcra Prod Ceram, Mogi Guacu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, CMDMC LIEC, Araraquara, SP, Brazil
dc.description.sponsorshipCT-PETRO
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFinanciadora de Estudos e Projetos (FINEP)
dc.description.sponsorshipPetrobras
dc.format.extent1086-1092
dc.identifierhttp://dx.doi.org/10.1016/j.materresbull.2008.10.007
dc.identifier.citationMaterials Research Bulletin. Oxford: Pergamon-Elsevier B.V. Ltd, v. 44, n. 5, p. 1086-1092, 2009.
dc.identifier.doi10.1016/j.materresbull.2008.10.007
dc.identifier.issn0025-5408
dc.identifier.urihttp://hdl.handle.net/11449/39746
dc.identifier.wosWOS:000264969200024
dc.language.isoeng
dc.publisherPergamon-Elsevier B.V. Ltd
dc.relation.ispartofMaterials Research Bulletin
dc.relation.ispartofjcr2.873
dc.relation.ispartofsjr0,746
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectOxidesen
dc.subjectChemical synthesisen
dc.subjectCrystal structureen
dc.subjectDefectsen
dc.subjectColor centersen
dc.titleThe influence of temperature on the color of TiO2:Cr pigmentsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderPergamon-Elsevier B.V. Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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