Abstract
A metastable liquid miscibility gap was shown to exist in the Na2O·CaO·SiO2 system. Nucleation rates were measured at a number of undercoolings for a composition at the edge of this gap. Accurate measurements were possible due to the extremely slow approach to equilibrium because of the high viscosities (>1010 P) of the liquid at the nucleation temperatures. The Lumsden-solution model and experimental miscibility-gap data were used to calculate volume free energies driving the separation at the various undercoolings. Measuring the variation of solubility temperature with particle size of the separating phase a value of 4.6 ergs cm−2 was obtained for the interfacial energy. An activation energy for diffusion of 94.5 kcal mole−1 was obtained from measured growth and miscibility-gap data. At most of the seven undercoolings the agreement between measured and calculated homogeneous nucleation rates when using the Lumsden model was excellent.
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