Estudo por espectroscopia micro-Raman dos mecanismos de separação de fase em vidros fosfatos de metais de transição

Micro-Raman spectroscopy studies of the phase separation mechanisms of transition-metal phosphate glasses

dc.creatorMazali, Italo Odone
dc.creatorAlves, Oswaldo Luiz
dc.creatorGimenez, Iara de Fátima
dc.date2009-01-01
dc.date2015-12-03T13:30:54Z
dc.date2015-12-03T13:30:54Z
dc.date.accessioned2018-03-29T01:24:54Z
dc.date.available2018-03-29T01:24:54Z
dc.identifierQuímica Nova. Sociedade Brasileira de Química, v. 32, n. 7, p. 1956-1960, 2009.
dc.identifier0100-4042
dc.identifierS0100-40422009000700045
dc.identifier10.1590/S0100-40422009000700045
dc.identifierhttp://dx.doi.org/10.1590/S0100-40422009000700045
dc.identifierhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000700045
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/23861
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/202480
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1302713
dc.descriptionGlass-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.
dc.description1956
dc.description1960
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languagept
dc.publisherSociedade Brasileira de Química
dc.relationQuímica Nova
dc.rightsaberto
dc.sourceSciELO
dc.subjectRaman spectroscopy
dc.subjectcrystallization
dc.subjectphosphate glasses
dc.titleEstudo por espectroscopia micro-Raman dos mecanismos de separação de fase em vidros fosfatos de metais de transição
dc.titleMicro-Raman spectroscopy studies of the phase separation mechanisms of transition-metal phosphate glasses
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución