Conductivity and F-19 NMR in PbGeO3-PbF2-CdF2 glasses and glass-ceramics

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dc.contributor.authorBueno, L. A.
dc.contributor.authorDonoso, J. P.
dc.contributor.authorMagon, C. J.
dc.contributor.authorKosacki, I
dc.contributor.authorFilho, FAD
dc.contributor.authorTambelli, C. C.
dc.contributor.authorMessaddeq, Younes [UNESP]
dc.contributor.authorRibeiro, SJL
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUNOESC
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionOak Ridge Natl Lab
dc.date.accessioned2014-05-20T15:29:08Z
dc.date.available2014-05-20T15:29:08Z
dc.date.issued2005-04-01
dc.description.abstractThe temperature dependence of the electrical conductivity and the F-19 nuclear magnetic resonance (NMR) of PbGeO3-PbF2CdF, glasses and glass ceramics are investigated. The measured conductivity values of the glasses are above 10(-5) Skin at 500 K, and increase with increasing lead fluoride content. Activation energies extracted from the conductivity data are in the range 0.59-0.73 eV. Results are consistent with the hypothesis that in these oxyfluoride glasses lead fluoride rich clusters are dispersed in a metagermanate based matrix providing increasing mobility pathways for conducting ions. The conductivity of a sample of the glass ceramic of composition (mol%) 60PbGeO(3-)20PbF(2)-20CdF(2) was found to be smaller than that in the corresponding glass, suggesting that there are poor ionic conducting regions in the interface between the nanometer sized crystals. The temperature dependence of the F-19 relaxation times, measured in the range 100-800 K, exhibit the qualitative features associated with high fluorine mobility in both, glass and glass ceramics materials. We suggest that de-convolution of the spin-lattice relaxation rates observed in the glass ceramics shows that the observed high temperature rate maximum is associated with the diffusional motions of the fluorine ions in beta-PbF2 crystals. (c) 2005 Elsevier B.V. All rights reserved.en
dc.description.affiliationUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUNOESC, Area Ciências Agroambientais & Alimentos, BR-89560000 Videira, SC, Brazil
dc.description.affiliationUSP, Inst Fis, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationOak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37830 USA
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.format.extent766-770
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2004.07.091
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 351, n. 8-9, p. 766-770, 2005.
dc.identifier.doi10.1016/j.jnoncrysol.2004.07.091
dc.identifier.issn0022-3093
dc.identifier.lattes2998503841917815
dc.identifier.lattes6446047463034654
dc.identifier.urihttp://hdl.handle.net/11449/38793
dc.identifier.wosWOS:000228869200021
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.titleConductivity and F-19 NMR in PbGeO3-PbF2-CdF2 glasses and glass-ceramicsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes2998503841917815
unesp.author.lattes6446047463034654
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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