Magnetic Resonance and Conductivity Study of Lead-Cadmium Fluorosilicate Glasses and Glass-Ceramics

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dc.contributor.authorSilva, Igor D.A.
dc.contributor.authorDonoso, José Pedro
dc.contributor.authorMagon, Claudio J.
dc.contributor.authorTambelli, Caio E.
dc.contributor.authorSantagneli, Silvia H. [UNESP]
dc.contributor.authorRibeiro, Sidney J.L. [UNESP]
dc.contributor.authorSilva, Mauricio A.P.
dc.contributor.authorChiesa, Mario
dc.contributor.authorRodrigues, Ana Candida M.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Juiz de Fora
dc.contributor.institutionUniversità di Torino
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2018-12-11T17:36:24Z
dc.date.available2018-12-11T17:36:24Z
dc.date.issued2018-03-22
dc.description.abstractThe fluorine motional dynamics in fluorosilicate glasses and glass-ceramics of the SiO2-PbF2-CdF2 system was investigated by complex impedance spectroscopy and 19F nuclear magnetic resonance (NMR) spectroscopy, and the coordination environment of a Cu2+ paramagnetic probe was examined by electron paramagnetic resonance (EPR) spectroscopy. Glass-ceramics were obtained by heat treatment of glass at a temperature between the glass-transition (Tg) and the onset of crystallization (Tx). Ionic conductivity of about 1.6 × 10-4 S/cm was obtained at 500 K for glass. The conductivity of the glass-ceramics was found to be lower than that obtained for the glass. The temperature dependence of the 19F NMR spin-lattice relaxation times was investigated between 300 and 770 K. The 19F NMR results of glass exhibit the qualitative features associated with fluorine mobility, namely, the presence of a relaxation rate maximum below Tg. The NMR relaxation data of the glass-ceramics were analyzed assuming two fluorine dynamics. Continuous-wave EPR spectroscopy, using a Cu2+ ion as a probe, was employed to determine the local symmetry of the ion environment and the nature of relevant spin interactions. The hyperfine coupling of Cu2+ with the 19F, 113Cd, and 207Pb nuclei in the glass and the glass-ceramic was investigated by electron spin echo envelope modulation and hyperfine sublevel correlation spectroscopy.en
dc.description.affiliationIFSC Universidade de Sao Paulo, P.O. Box 369
dc.description.affiliationFZEA Universidade de Sao Paulo
dc.description.affiliationIQ Universidade Estadual Paulista (Unesp)
dc.description.affiliationDQ Universidade Federal de Juiz de Fora
dc.description.affiliationDipartimento di Chimica Università di Torino, Via P. Giuria 7
dc.description.affiliationLaMaV DEMA Universidade Federal de Sao Carlos
dc.description.affiliationUnespIQ Universidade Estadual Paulista (Unesp)
dc.format.extent6288-6297
dc.identifierhttp://dx.doi.org/10.1021/acs.jpcc.7b11517
dc.identifier.citationJournal of Physical Chemistry C, v. 122, n. 11, p. 6288-6297, 2018.
dc.identifier.doi10.1021/acs.jpcc.7b11517
dc.identifier.issn1932-7455
dc.identifier.issn1932-7447
dc.identifier.scopus2-s2.0-85044356132
dc.identifier.urihttp://hdl.handle.net/11449/179698
dc.language.isoeng
dc.relation.ispartofJournal of Physical Chemistry C
dc.relation.ispartofsjr2,135
dc.relation.ispartofsjr2,135
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.titleMagnetic Resonance and Conductivity Study of Lead-Cadmium Fluorosilicate Glasses and Glass-Ceramicsen
dc.typeArtigo
unesp.author.orcid0000-0002-0827-073X[2]
unesp.author.orcid0000-0002-5456-6347[5]
unesp.author.orcid0000-0002-8162-6747[6]
unesp.author.orcid0000-0001-8128-8031[8]
unesp.author.orcid0000-0003-1689-796X[9]

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