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Type: Artigo de periódico
Title: Estudo por espectroscopia micro-Raman dos mecanismos de separação de fase em vidros fosfatos de metais de transição
Title Alternative: Micro-Raman spectroscopy studies of the phase separation mechanisms of transition-metal phosphate glasses
Author: Mazali, Italo Odone
Alves, Oswaldo Luiz
Gimenez, Iara de Fátima
Abstract: 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
phosphate glasses
Editor: Sociedade Brasileira de Química
Citation: Química Nova. Sociedade Brasileira de Química, v. 32, n. 7, p. 1956-1960, 2009.
Rights: aberto
Identifier DOI: 10.1590/S0100-40422009000700045
Date Issue: 1-Jan-2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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