Paper Title:
Lead-Cadmium Fluorogermanate Glasses and Transparent Glass-Ceramics. Spectroscopy and Structure
  Abstract

In Lead-cadmium fluorogermanate glasses (PbF2-CdF2-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. Eu3+ emission and vibronic spectra are used to follow the crystallization process leading to transparent glass ceramics.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
1299-1304
DOI
10.4028/www.scientific.net/MSF.514-516.1299
Citation
S. J. L. Ribeiro, Y. Messaddeq, L.A. Bueno, J. Dexpert-Ghys, A.S. Gouveia-Neto, C.C. Tambelli, J.P. Donoso, C. Magon, "Lead-Cadmium Fluorogermanate Glasses and Transparent Glass-Ceramics. Spectroscopy and Structure", Materials Science Forum, Vols. 514-516, pp. 1299-1304, 2006
Online since
May 2006
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