Structural and optical study of glasses in the TeI2-GeO2-PbF2 ternary system

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dc.contributor.authorPereira, Camila
dc.contributor.authorCassanjes, Fabia C.
dc.contributor.authorBarbosa, Juliana S.
dc.contributor.authorGoncalves, Rogeria R.
dc.contributor.authorRibeiro, Sidney J. L. [UNESP]
dc.contributor.authorPoirier, Gael
dc.contributor.institutionUniv Fed Alfenas
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-28T15:26:08Z
dc.date.available2018-11-28T15:26:08Z
dc.date.issued2017-05-01
dc.description.abstractNew glass compositions were investigated in this specific proportion (90-x)TeO2-10GeO(2)-xPbF(2) in order to study the influence of lead fluoride content on the thermal, structural and optical properties. Glass samples with x = 5 to 30% were prepared by melt-quenching method. Thermal characterizations by DSC allowed to identify a clear decrease of the glass transition temperature as well as a very distinct crystallization behavior for higher PbF2 contents. Raman spectroscopy suggests a progressive PbF2 incorporation with conversion of TeO4 to TeO3 units related with the modifier behavior of PbF2 in the glass network. X-ray diffraction patterns of crystallized samples support these results since crystalline TeO2 was detected for lower PbF2 contents whereas lead tellurite Pb2Te3O7 was identified for the most lead fluoride concentrated sample. UV-Vis-MR absorption spectra are in agreement with a progressive increase of the optical bandgap with lead fluoride concentration. Emission spectra of Eu3+ doped samples also pointed out a progressive structural change around Eu3+ ions with more symmetric sites. Finally, experimental lifetimes, Judd-Ofelt parameters and quantum efficiencies were obtained from these samples and exhibited a strong dependency of the lead fluoride contents, suggesting that these new fluorotellurite glasses are interesting hosts for rare earth ions. (C) 2017 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Fed Alfenas, Grp Quim Mat, Campus Pocos de Caldas, Pocos De Caldas, MG, Brazil
dc.description.affiliationUniv Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
dc.description.sponsorshipFINEP (CT-INFRA)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPEMIG: CEX-APQ-01410-12
dc.description.sponsorshipIdCNPq: 552225/2011-8
dc.format.extent158-162
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2017.02.021
dc.identifier.citationJournal Of Non-crystalline Solids. Amsterdam: Elsevier Science Bv, v. 463, p. 158-162, 2017.
dc.identifier.doi10.1016/j.jnoncrysol.2017.02.021
dc.identifier.fileWOS000405154700022.pdf
dc.identifier.issn0022-3093
dc.identifier.urihttp://hdl.handle.net/11449/165662
dc.identifier.wosWOS:000405154700022
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of Non-crystalline Solids
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectGlass
dc.subjectTellurite
dc.subjectFluoride
dc.subjectPhotoluminescence
dc.titleStructural and optical study of glasses in the TeI2-GeO2-PbF2 ternary systemen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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