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dc.contributor.authorMessaddeq, S. H.-
dc.contributor.authorMastelaro, V. R.-
dc.contributor.authorLi, M. S.-
dc.contributor.authorTabackniks, M.-
dc.contributor.authorLezal, D.-
dc.contributor.authorRamos, A.-
dc.contributor.authorMessaddeq, Younes-
dc.identifier.citationApplied Surface Science. Amsterdam: Elsevier B.V., v. 205, n. 1-4, p. 143-150, 2003.-
dc.description.abstractIrreversible photoexpansion and photobleaching effect has been observed in amorphous Ga10Ge25S65 glass when its surface was exposed to light with energy greater than the band gap, 3.52 eV. The magnitude of the expansion of GaGeS glasses depends on the exposure conditions. Extended X-ray absorption fine structure (EXAFS) spectroscopy and Rutherford backscattering spectrometry (RBS) have been used to identify the chemical nature of the glass samples before and after illumination. The quantitative analysis of the EXAFS data leads to a two-shell model of 0.5 oxygen atoms at 2.01 Angstrom and 3.6 sulfur atoms at a 2.20 Angstrom. RBS technique demonstrated that chemical composition of the glass surface after irradiation is oxygen rich. The existence of Ge-O bonds in the glass after illumination was also confirmed by infrared measurements. (C) 2002 Elsevier B.V. B.V. All rights reserved.en
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectchalcogenide glassespt
dc.titleThe influence of oxygen in the photoexpansion of GaGeS glassesen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionAcad Sci Czech Republ-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil-
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315 São Paulo, Brazil-
dc.description.affiliationAcad Sci Czech Republ, Lab Inorgan Mat IIC, Prague 6, Czech Republic-
dc.description.affiliationICT, Prague 6, Czech Republic-
dc.description.affiliationLNLS, Campinas, SP, Brazil-
dc.description.affiliationUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofApplied Surface Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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