Abstract
AbstractMeasurements were made of the rates of crystal growth in a series of glasses with 74% SiO2, 16% Na2O, and 10% (CaO + MgO), the MgO replacing the CaO in 2% steps; and in a series of glasses with 17% Na2O, 12% CaO, and 71% (SiO2+ Al2O3), the alumina replacing the silica in 2% steps up to 8% Al2O3. A study was also made of the rate of crystal solution in the series with variable alumina. The results are explained qualitatively by considering the viscosity and crystallization temperature changes of the glasses as the composition varied.The substitution of MgO for CaO to the composition with the minimum liquidus decreased the maximum rate of crystal growth of cristobalite (primary phase) and devitrite (secondary phase) and further substitutions increased the rate of crystal growth of diopside and Na2O·2MgO·6SiO2. Substitution of Al2O3 for SiO2, decreased the maximum rate of crystal growth of devitrite, and substitutions of more than 4% of Al2O3 increased the rate of crystal growth of wollastonite.
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