dc.contributorUniversidade Federal Rural de Pernambuco (UFRPE)
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:31:36Z
dc.date.available2014-05-20T15:31:36Z
dc.date.created2014-05-20T15:31:36Z
dc.date.issued2008-04-09
dc.identifierJournal of Physics-condensed Matter. Bristol: Iop Publishing Ltd, v. 20, n. 14, p. 7, 2008.
dc.identifier0953-8984
dc.identifierhttp://hdl.handle.net/11449/40695
dc.identifier10.1088/0953-8984/20/14/145201
dc.identifierWOS:000254175100003
dc.identifier2998503841917815
dc.identifier6446047463034654
dc.identifier0000-0003-3286-9440
dc.description.abstractTransparent oxyfluoride glasses and beta-PbF(2) nanocrystals containing glass-ceramics were prepared with varying Eu(3+) content (0.3, 0.4, 0.5 and 0.6%). The effect of Eu(3+) content on the preparation of glass-ceramics was investigated. From differential scanning calorimetry, the T(x)-T(g)(T(x)-temperature of the onset of crystallization; T(g)-glass transition temperature) parameter for glasses has shown slight variation, and an exothermic peak near T(g) called the ceramization temperature (T(c)) has been observed. Heat treatments were performed at this temperature to obtain transparent glass-ceramics containing beta-PbF(2) nanocrystals, identified by x-ray diffraction. Heat treatments for different periods of time were performed and were observed to be very important in the control of the crystal size and of the crystallization rate. Based upon the absorption spectra, the scattering level due to the presence of beta-PbF(2) nanocrystals in the glass-ceramics was observed to be similar to that for the mother glasses. Detailed analysis of emission spectra and decay time measurements led to the identification of Eu(3+) ions as the beta-PbF(2) crystalline phase. Excitation spectra at 70 K show the interaction of Eu(3+) ions with the fluorogermanate network.
dc.languageeng
dc.publisherIop Publishing Ltd
dc.relationJournal of Physics: Condensed Matter
dc.relation2.617
dc.relation0,875
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.titleStructural and spectroscopic study of oxyfluoride glasses and glass-ceramics using europium ion as a structural probe
dc.typeArtículos de revistas


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