Nucleation and crystal growth in Na2O · 2 CaO · 3 SiO2 glass: a DTA study |
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Authors: | A Marotta S Saiello F Branda A Buri |
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Institution: | Instituto di Chimica, Facoltà d''Ingegneria, Napoli Italy |
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Abstract: | The non-isothermal devitrification of Na2O · 2 CaO · 3 SiO2 glass has been studied by differential thermal analysis in order to evaluate, from DTA curves, the temperature of maximum nucleation rate, Tm, and the activation energy values, Ec, for crystal growth.The temperature, Tm=580°C, is very close to the glass transition temperature, Tg=570°C, and the value of Ec=78 Kcal mole?1 for the surface crystal growth is nearly the same as the value Ec=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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