EFFECT OF PT DOPING ON NUCLEATION AND CRYSTALLIZATION IN LI2O-CENTER-DOT-2SIO(2) GLASS - EXPERIMENTAL MEASUREMENTS AND COMPUTER MODELING

Heterogeneous nucleation and its effects on the crystallization of lit hium disilicate glass containing small amounts of Pt are investigated. Measurements of the nucleation frequencies and induction times with a nd without Pt are shown to be consistent with predictions based on the classical nucleation theory. A realistic computer model for the trans formation is presented. Computed differential thermal analysis data (s uch as crystallization rates as a function of time and temperature) ar e shown to be in good agreement with experimental results. This modeli ng provides a new, more quantitative method for analyzing calorimetric data.