First measurements of time-dependent nucleation as a function of composition in Na2O · 2CaO · 3SiO2 glasses |
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Authors: | K Lakshmi Narayan K F Kelton |
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Institution: | Department of Physics, Washington University, Box 1105, One Brookings Drive, St. Louis, MO 63130, USA |
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Abstract: | First measurements of the composition dependence of the time-dependent nucleation rate are presented. Nucleation rates of the stoichiometric crystalline phase, Na2O · 2CaO · 3SiO2, from quenched glasses made with different SiO2 concentrations were determined as a function of temperature and glass composition. A strong compositional dependence of the nucleation rates and a weak dependence for the induction times were observed. Using measured values of the liquidus temperatures and growth velocities as a function of glass composition, these data are shown to be consistent with predictions from the classical theory of nucleation, assuming a composition-dependent interfacial energy. |
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