Lead-Cadmium Fluorogermanate Glasses and Transparent Glass-Ceramics. Spectroscopy and Structure-Reference-Cited by-同舟云学术

Lead-Cadmium Fluorogermanate Glasses and Transparent Glass-Ceramics. Spectroscopy and Structure

Published:2006-05 Issue: Volume:514-516 Page:1299-1304
ISSN:1662-9752
Container-title:Materials Science Forum
language:
Short-container-title:MSF

Author:

Ribeiro Sidney José Lima¹,Messaddeq Younes¹,Bueno L.A.²,Dexpert-Ghys J.³,Gouveia-Neto A.S.⁴,Tambelli C.C.⁵,Donoso J.P.⁶,Magon C.⁶

Affiliation:

1. UNESP

2. Area de Ciencias Agro-Ambientais e Alimentos

3. CEMES

4. Universidade Federal de Pernambuco

5. Instituto de Fisica-USP,

6. Universidade de São Paula

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.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

https://www.scientific.net/MSF.514-516.1299.pdf

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