Abstract
Time and temperature dependences of the nucleation rate of Li 2O · 2SiO 2 and 2Na 20 · CaO · 3SiO 2 crystals in glasses of the same composition have been studied by a “development” method. It has been found that nucleation kinetics are satisfactorily described by classical nucleation theory. A new phenomenon observed is the strong influence of preliminary isothermal exposure of a glass on nonstationary nucleation taking place at temperature higher than that of the preliminary heat treatment. The phenomenon is ascribed to heterophase fluctuations during the preliminary heat treatment.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have