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Thermodynamic study of Na2O-SiO2 melts at 1300° and 1400 °C

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Abstract

The vapor pressures of Na above stirred Na2O-SiO2 melts in equilibrium with graphite and CO were determined at 1300° and 1400 °C using the transpiration technique. Compositions studied ranged from about 60 mole pct SiO2 to close to SiO2 saturation. Activities of components Na2O and SiO2 were calculated from the data. Log aNa2O (pure liquid as standard state) varies from about −8.7 and −8.5 at silica saturation to −6.3 and −6.1 at 40 mole pct Na2O at 1300° and 1400 °C, and the molar Gibbs energy of mixing, ΔG m, at the disilicate composition (XNa2O = 0.33) at each of these temperatures is −83.0 and −85.4 kJ, respectively. The Toop and Samis, Yokokawa and Niwa, and Lin and Pelton solution models for binary silicates were applied to the ΔG m data at 1350 °C and parameters for the models were estimated to give best fits. All three models show good correspondence with the measured ΔG m curve. The capabilities of the models in predicting activity data in this system have been compared.

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Authors and Affiliations

  1. Homer Research Laboratory, Bethlehem Steel Corporation, 18016, Bethlehem, PA

    D. N. Rego

  2. Cabot Research and Development, P.O. Box 1462, 19603, Reading, PA

    G. K. Sigworth

  3. Metallurgical Engineering and Materials Science, Carnegie-Mellon University, 15213, Schenley Park, Pittsburgh, PA

    W. O. Philbrook (Emeritus Professor)

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  1. D. N. Rego
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  2. G. K. Sigworth
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  3. W. O. Philbrook
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D. N. Rego, Formerly Graduate Student at Carnegie-Mellon University,

G.K. Sigworth, Formerly with Carnegie-Mellon University,

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Rego, D.N., Sigworth, G.K. & Philbrook, W.O. Thermodynamic study of Na2O-SiO2 melts at 1300° and 1400 °C. Metall Trans B 16, 313–323 (1985). https://doi.org/10.1007/BF02679722

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  • DOI: https://doi.org/10.1007/BF02679722

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