Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/56759
Type: Artigo de periódico
Title: MICRO-RAMAN SPECTROSCOPY STUDIES OF THE PHASE SEPARATION MECHANISMS OF TRANSITION-METAL PHOSPHATE GLASSES.
Author: Mazali, IO
Alves, OL
Gimenez, ID
Abstract: MICRO-RAMAN SPECTROSCOPY STUDIES OF THE PHASE SEPARATION MECHANISMS OF TRANSITION-METAL PHOSPHATE GLASSES. Glass-ceramics are prepared by controlled separation of crystal phases in glasses, leading to uniform and dense grain structures. On the other hand, chemical leaching of soluble crystal phases yields porous glass-ceramics with important applications. Here, glass/ceramic interfaces of niobo-, vanado- and titano-phosphate glasses were studied by micro-Raman spectroscopy, whose spatial resolution revealed the multiphase structures. Phase-separation mechanisms were also determined by this technique, revealing that interface composition remained unchanged as the crystallization front advanced for niobo- and vanadophosphate glasses (interface-controlled crystallization). For titanophosphate glasses, phase composition changed continuously with time up to the equilibrium composition, indicating a spinodal-type phase separation.
Subject: Raman spectroscopy
crystallization
phosphate glasses
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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