Ribeiro, Sidney José Lima [UNESP]Messaddeq, Younes [UNESP]Bueno, L. A.Dexpert-Ghys, J.Gouveia-Neto, A. S.Tambelli, C. C.Donoso, J. P.Magon, C.2014-05-272014-05-272006-12-01Materials Science Forum, v. 514-516, n. PART 2, p. 1299-1304, 2006.0255-5476http://hdl.handle.net/11449/69304In Lead-cadmium fluorogermanate glasses (PbF2-CdF 2-PbGeO3) the addition of metal fluorides to the base PbGeO3 glass leads to a decrease of the glass transition temperature (Tg) and to an enhancement of the ionic conductivity properties. Based on different spectroscopic techniques (19F NMR, Ge K-edge X-ryas absorption and Raman scattering) an heterogeneous glass structure is proposed at the molecular scale, which can be described by fluoride rich regions permeating the metagermanate chains. The temperature dependence of the 19F NMR lineshapes and relaxation times exhibits the qualitative and quantitative features associated with the high fluoride mobility in these systems. Eu 3+ emission and vibronic spectra are used to follow the crystallization process leading to transparent glass ceramics.1299-1304eng19F NMREuropiumGlass ceramicsIonic conductionLanthanidesOxyfluoride glassesVibronic spectrumCadmiumGlass transitionRelaxation processesTrabalho apresentado em evento10.4028/www.scientific.net/MSF.514-516.1299WOS:000238056400259Acesso aberto2-s2.0-37849037250644604746303465429985038419178150000-0003-3286-9440