Detailed nucleation, growth and overall crystallisation data has been obtained for a Li2O.2SiO2 glass treated at 500 degrees C. It was shown that apparant "induction" periods of 1 to 3 hours, detected in single-stage treatments, are mostly due to the time required for growth of the critical nuclei to sizes detectable by optical microscopy. As the "induction" times determined by three distinct kinetic parameters are similar, it can be concluded that, any metastable phase that might nucleate in the early crystallisation stages has no significant influence on the overall crystallisation kinetics.
Origin
Federal University Of Sao Carlos, Brazil
Journal Title
Proc Of Xvi Icg, Beijing, China Vol7 1995 60-65
Sector
Special Glass
Class
S 1471