Structural studies in lead germanate glasses: EXAFS and vibrational spectroscopy

Página do item simplificado
dc.contributor.authorRibeiro, S.J.L [UNESP]
dc.contributor.authorDexpert-Ghys, J
dc.contributor.authorPiriou, B
dc.contributor.authorMastelaro, V.R
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCNRS
dc.contributor.institutionUniversité Paris Sud
dc.date.accessioned2014-05-27T11:17:54Z
dc.date.available2014-05-27T11:17:54Z
dc.date.issued1993-12-01
dc.description.abstractThe Raman, IR absorption and EXAFS spectra at the Ge K-edge and Pb LIII-edge of eight lead germanate glasses, with general formula xPbO(1-x)GeO2 with x = 0.20, 0.25, 0.33, 0.40, 0.50, 0.53, 0.56 and 0.60, have been measured. The occurrence of [GeO6] units besides [GeO4] could not be deduced unambiguously from the data. The vibrational and EXAFS data agree with a progressive depolymerization of the network. Starting from all Ge atoms linked to four bridging oxygens in GeO2 (x = 0), the number of tetrahedral units with one or two non-bridging oxygens increases with x. At low content, Pb2+ ions act as modifiers in the germanate structure, but to a lesser extent than an equivalent number of alkaline ions. © 1993.en
dc.description.affiliationInstituto de Química - UNESP, CP 355, 14800-900 Araraquara, SP
dc.description.affiliationLaboratoire des Eléments de Transition dans les Solides CNRS, 1, Pl. A. Briand, 92195 Meudon cédex
dc.description.affiliationLURE Université Paris Sud, 91405 Orsay
dc.description.affiliationUnespInstituto de Química - UNESP, CP 355, 14800-900 Araraquara, SP
dc.format.extent213-221
dc.identifierhttp://dx.doi.org/10.1016/0022-3093(93)90225-M
dc.identifier.citationJournal of Non-Crystalline Solids, v. 159, n. 3, p. 213-221, 1993.
dc.identifier.doi10.1016/0022-3093(93)90225-M
dc.identifier.issn0022-3093
dc.identifier.scopus2-s2.0-0027625227
dc.identifier.urihttp://hdl.handle.net/11449/64398
dc.identifier.wosWOS:A1993LK25800003
dc.language.isoeng
dc.relation.ispartofJournal of Non-Crystalline Solids
dc.relation.ispartofjcr2.488
dc.relation.ispartofsjr0,722
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectAtoms
dc.subjectIons
dc.subjectLight absorption
dc.subjectMolecular structure
dc.subjectOxygen
dc.subjectAlkaline ions
dc.subjectBridging oxygen
dc.subjectDepolymerization
dc.subjectLead germanate glasses
dc.subjectNonbridging oxygens
dc.subjectGlass
dc.titleStructural studies in lead germanate glasses: EXAFS and vibrational spectroscopyen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
unesp.author.orcid0000-0002-6512-2530[4]
unesp.author.orcid0000-0003-3286-9440[1]
unesp.author.orcid0000-0001-9512-4214[4]

Arquivos

Coleções

Artigos