Abstract
The non-isothermal devitrification of Na 2O · 2 CaO · 3 SiO 2 glass has been studied by differential thermal analysis in order to evaluate, from DTA curves, the temperature of maximum nucleation rate, T m, and the activation energy values, E c, for crystal growth. The temperature, T m=580°C, is very close to the glass transition temperature, T g=570°C, and the value of E c=78 Kcal mole −1 for the surface crystal growth is nearly the same as the value E c=89 kcal mole −1 for the bulk crystal growth; both are consistent with the activation energy for viscous flow. It is also pointed out that the nucleation rate—temperature curve and the crystallization rate—temperature curve are partially overlapped.
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