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

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.

Abstract licence: CC BY-NC

3 more references, whose wording the paper’s licence keeps private.

A person counts once a day per paper. We keep no cookie and no address: a reader is a hash that changes every day. Any month under five reads shows no number.