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dc.contributor.authorRizzato, A. P.-
dc.contributor.authorSantilli, Celso Valentim-
dc.contributor.authorPulcinelli, Sandra Helena-
dc.contributor.authorMessaddeq, Younes-
dc.contributor.authorCraievich, A. F.-
dc.contributor.authorHammer, Peter-
dc.date.accessioned2014-05-20T15:24:25Z-
dc.date.accessioned2016-10-25T17:58:37Z-
dc.date.available2014-05-20T15:24:25Z-
dc.date.available2016-10-25T17:58:37Z-
dc.date.issued2004-11-15-
dc.identifierhttp://dx.doi.org/10.1016/j.jnoncrysol.2004.08.123-
dc.identifier.citationJournal of Non-crystalline Solids. Amsterdam: Elsevier B.V., v. 348, p. 38-43, 2004.-
dc.identifier.issn0022-3093-
dc.identifier.urihttp://hdl.handle.net/11449/35027-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/35027-
dc.description.abstractThe surface corrosion process associated with the hydrolysis of fluorozirconate glass, ZBLAN (53ZrF(4), 20BaF(2), 20NaF, 4LaF(2), 3AlF(3)) was investigated using X-ray photoelectron spectroscopy (XPS), grazing-incidence small angle X-ray scattering (GISAXS), X-ray reflectivity (XRR) and scanning electron microscopy (SEM). After a short exposure period (25 min) of the glass surface to deionized water the XPS data indicate an increase of the oxygen content accompanied by a decrease of fluorine concentration. The analysis of the chemical bonding structure identified the predominant surface reaction products as zirconium hydroxyfluoride and oxyfluoride species. The second most abundant glass component, bariumfluoride, remains almost unaffected by oxygen, while sodium fluoride is completely removed from the attacked surface region. The detected structural and compositional changes are related to the selective dissolution of the glass components leading to the formation of a new surface phase. This process is accompanied by a visible surface roughening caused by reprecipitated species, observed by SEM. The modification of the glass surface is responsible for an increase of the GISAXS intensity. The scattering was attributed to nanovoids formed at the surface region of the glass with an average size of 2.4 +/- 0.05 nm. (C) 2004 Elsevier B.V. All rights reserved.en
dc.format.extent38-43-
dc.language.isoeng-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.titleStudy on the initial stages of water corrosion of fluorozirconate glassesen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv Bourgogne-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUniv Bourgogne, LRRS, F-21004 Dijon, France-
dc.description.affiliationUSP, Inst Fis, BR-09500900 São Paulo, Brazil-
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.identifier.doi10.1016/j.jnoncrysol.2004.08.123-
dc.identifier.wosWOS:000225563300008-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Non-Crystalline Solids-
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