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Thermodynamic evaluation and optimization of the Ca−Si system

  • Section I: Basic and Applied Research
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Abstract

All available phase equilibria and thermodynamic data for the Ca−Si system were collected and critically evaluated. In a first step, the thermodynamic properties of Ca(g) were obtained from experimental vapor pressure data over pure Ca. The new vapor pressure of calcium over pure solid and liquid was used as a new reference to model the thermodynamic properties of the intermediate stoichiometric Ca−Si compounds together with other thermodynamic and phase diagram data found in the literature (liquidus temperatures, heat capacities, pressures of Ca, and heats of reaction). Optimization was performed to obtain the parameters of one set of model equations for the different solid and liquid phases to best reproduce all the experimental data simultaneously. In this way, the data are rendered self-consistent, discrepancies among the data are identified, and extrapolations and interpolations can be performed. For the liquid phase, the Modified Quasichemical Model in the Pair Approximation for short-range ordering was used.

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  1. Centre for Research in Computational Thermochemistry (CRCT), Ecole Polytechnique, Succursale Downtown, CP 6079, H3C 3A7, Montreal, Quebec, Canada

    Matthias Heyrman & Patrice Chartrand

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  1. Matthias Heyrman
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  2. Patrice Chartrand
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Heyrman, M., Chartrand, P. Thermodynamic evaluation and optimization of the Ca−Si system. JPED 27, 220–230 (2006). https://doi.org/10.1361/154770306X109755

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  • DOI: https://doi.org/10.1361/154770306X109755

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