Lead-cadmium fluorogermanate glasses and transparent glassceramics. Spectroscopy and structure
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
01/12/2006
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Resumo |
In 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. |
Formato |
1299-1304 |
Identificador |
http://dx.doi.org/10.4028/www.scientific.net/MSF.514-516.1299 Materials Science Forum, v. 514-516, n. PART 2, p. 1299-1304, 2006. 0255-5476 http://hdl.handle.net/11449/69304 10.4028/www.scientific.net/MSF.514-516.1299 WOS:000238056400259 2-s2.0-37849037250 |
Idioma(s) |
eng |
Relação |
Materials Science Forum |
Direitos |
closedAccess |
Palavras-Chave | #19F NMR #Europium #Glass ceramics #Ionic conduction #Lanthanides #Oxyfluoride glasses #Vibronic spectrum #Cadmium #Glass transition #Relaxation processes |
Tipo |
info:eu-repo/semantics/conferencePaper |