Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies

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dc.contributor.authorSantagneli, Silvia H. [UNESP]
dc.contributor.authorPoirier, Gael
dc.contributor.authorRinke, Matthias T.
dc.contributor.authorRibeiro, Sidney José Lima [UNESP]
dc.contributor.authorMessaddeq, Younes [UNESP]
dc.contributor.authorEckert, Hellmut
dc.contributor.institutionUniv Laval
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Alfenas (UNIFAL)
dc.contributor.institutionUniv Munster
dc.date.accessioned2014-05-20T14:18:39Z
dc.date.available2014-05-20T14:18:39Z
dc.date.issued2011-05-01
dc.description.abstractGlasses were prepared in the pseudo-binary system (1 - x)AgPO(3)-xWO(3) (0 <= x <= 0.6 mol%). The structural evolution of the vitreous network was studied as a function of composition by thermal analysis, Fourier Transform Infrared spectroscopy (FTIR). Raman scattering, high resolution (31)P solid state NMR and XANES at the W-L(1) absorption edge. For compositions with x ranging from 0 to 0.5 a pronounced increase in the glass transition temperature is observed, suggesting a significant increase in the glass network connectivity. At the same time Raman spectra indicate that tungsten atoms are linked to non-bridging oxygen atoms (W-O- or W=O bonded species) whereas the (31)P MAS-NMR spectra indicate the successive formation of new P-O-W linkages. The formation of some anionic tungsten sites (if these are revealed by the presence of W-O terminal bonds) implies an increase in the average degree of polymerization of the phosphate network, which is consistent with the compositional evolution of the (31)P MAS-NMR spectra at low x values. For higher x-values. the Raman spectra indicate the presence of W-O-W linkages. W-L(1) XANES data indicate that at least 90% of tungsten atoms are octahedrally coordinated. (c) 2011 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Laval, Ctr Opt Photon & Laser, Quebec City, PQ G1V0A6, Canada
dc.description.affiliationSão Paulo State Univ, UNESP, Inst Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Alfenas, Inst Sci & Technol, Alfenas, MG, Brazil
dc.description.affiliationUniv Munster, Inst Phys Chem, D-48149 Munster, Germany
dc.description.affiliationUnespSão Paulo State Univ, UNESP, Inst Chem, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipDeutsche Forschungsgemeinschaft (DFG)
dc.description.sponsorshipDeutscher Akademischer Austauschdienst (DAAD)
dc.description.sponsorshipFond de Chemischen Industrie
dc.description.sponsorshipIdDFG: SFB 458
dc.format.extent2126-2131
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2011.01.021
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 357, n. 10, p. 2126-2131, 2011.
dc.identifier.doi10.1016/j.jnoncrysol.2011.01.021
dc.identifier.issn0022-3093
dc.identifier.lattes6446047463034654
dc.identifier.lattes2998503841917815
dc.identifier.orcid0000-0003-3286-9440
dc.identifier.urihttp://hdl.handle.net/11449/25628
dc.identifier.wosWOS:000291172500019
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectTungstate glassesen
dc.subjectGlass structureen
dc.subjectSolid state NMRen
dc.subjectRamanen
dc.subjectXANESen
dc.titleStructural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopiesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes6446047463034654
unesp.author.lattes2998503841917815
unesp.author.orcid0000-0003-3286-9440[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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