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dc.contributor.authorZiemath, E. C.-
dc.contributor.authorAegerter, M. A.-
dc.contributor.authorMelo, F. E A-
dc.contributor.authorMoreira, J. E.-
dc.contributor.authorMendes Filho, J.-
dc.contributor.authorDantas, M. S S-
dc.contributor.authorPimenta, M. A.-
dc.identifier.citationJournal of Non-Crystalline Solids, v. 194, n. 1-2, p. 41-47, 1996.-
dc.description.abstractPre-resonant Raman effect of chromate ion, CrO2- 4, was observed in a metasilicate glass with molar composition 2Na2O · 1CaO · 3SiO2 containing 1.0 wt% of Cr2O3. Raman spectra were measured by the conventional 90° scattering geometry and by the microprobe Raman spectroscopic techniques. The presence of chromate ions in the glass is favoured by the glass composition and oxidizing conditions during the glass melting, and they are responsible for optical absorption bands at 370 and 250 nm. Raman spectrum of the undoped glass presents bands at 625, 860 and 980 cm-1, and the presence of chromate ions gives rise to additional bands at 365, 850 and a shoulder at 890 cm-1. An enhancement of the 850 cm-1 Raman band is observed with decreasing laser exciting wavelength. The exciting frequency dependence of the intensity of this band is discussed in terms of theoretical models given in the literature.en
dc.titlePre-resonant Raman effect of CrO2- 4 in a metasilicate glassen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionDepartamento de Física-
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)-
dc.description.affiliationDepartamento de Física IGCE UNESP, Caixa Postal 178, 13500-970 Rio Claro (SP)-
dc.description.affiliationInst. de Fis. de São Carlos USP, Caixa Postal 369, 13560-970 São Carlos (SP)-
dc.description.affiliationDepartamento de Física Campus do PICI, Caixa Postal 6030, 60455-970 Fortaleza (CE)-
dc.description.affiliationDepartamento de Física ICEX UFMG, Caixa Postal 702, 30161-970 Belo Horizonte (MG)-
dc.description.affiliationUnespDepartamento de Física IGCE UNESP, Caixa Postal 178, 13500-970 Rio Claro (SP)-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Non-Crystalline Solids-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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