Glass structure and ion dynamics of lead-cadmium fluorgermanate glasses

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dc.contributor.authorTambelli, C. C.
dc.contributor.authorDonoso, J. P.
dc.contributor.authorMagon, C. J.
dc.contributor.authorBueno, L. A.
dc.contributor.authorMessaddeq, Younes [UNESP]
dc.contributor.authorRibeiro, SJL
dc.contributor.authorde Oliveira, LFC
dc.contributor.authorKosacki, I
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Juiz de Fora (UFJF)
dc.contributor.institutionOak Ridge Natl Lab
dc.date.accessioned2014-05-20T15:27:09Z
dc.date.available2014-05-20T15:27:09Z
dc.date.issued2004-05-22
dc.description.abstractGlass structure and fluorine motion dynamics are investigated in lead-cadmium fluorgermanate glasses by means of differential scanning calorimetry, Raman scattering, x-ray absorption (EXAFS), electrical conductivity (EC), and F-19 nuclear magnetic resonance (NMR) techniques. Glasses with composition 60PbGeO(3)-xPbF(2)-yCdF(2) (in mol %), with x+y=40 and x=10, 20, 30, 40, are studied. Addition of metal fluorides to the base PbGeO3 glass leads to a decrease of the glass transition temperature (T-g) and to an enhancement of the ionic conductivity properties. Raman and EXAFS data analysis suggest that metagermanate chains form the basic structural feature of these glasses. The NMR study leads to the conclusion that the F-F distances are similar to those found in pure crystalline phases. Experimental results suggest the existence of a heterogeneous glass structure at the molecular scale, which can be described by fluorine rich regions permeating the metagermanate chains. The temperature dependence of the NMR line shapes and relaxation times exhibits the qualitative and quantitative features associated with the high fluorine mobility in these systems. (C) 2004 American Institute of Physics.en
dc.description.affiliationUSP, Inst Phys, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUNESP, Inst Chem, Lab Photon Mat, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUFJF, Inst Ciências Exatas, BR-36036330 Juiz de Fora, MG, Brazil
dc.description.affiliationOak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37830 USA
dc.description.affiliationUnespUNESP, Inst Chem, Lab Photon Mat, BR-14801970 Araraquara, SP, Brazil
dc.format.extent9638-9647
dc.identifierhttp://dx.doi.org/10.1063/1.1712905
dc.identifier.citationJournal of Chemical Physics. Melville: Amer Inst Physics, v. 120, n. 20, p. 9638-9647, 2004.
dc.identifier.doi10.1063/1.1712905
dc.identifier.fileWOS000221268300025.pdf
dc.identifier.issn0021-9606
dc.identifier.lattes2998503841917815
dc.identifier.lattes6446047463034654
dc.identifier.urihttp://hdl.handle.net/11449/37192
dc.identifier.wosWOS:000221268300025
dc.language.isoeng
dc.publisherAmerican Institute of Physics (AIP)
dc.relation.ispartofJournal of Chemical Physics
dc.relation.ispartofjcr2.843
dc.relation.ispartofsjr1,252
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleGlass structure and ion dynamics of lead-cadmium fluorgermanate glassesen
dc.typeArtigo
dcterms.licensehttp://publishing.aip.org/authors/web-posting-guidelines
dcterms.rightsHolderAmer Inst Physics
unesp.author.lattes2998503841917815
unesp.author.lattes6446047463034654
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Inorgânica - IQ