Abstract
The heat contents (H T − H 298K) of Sc5Si3 and ScSi in the Sc–Si system were measured by drop calorimetry method from 400 to 1,200 °C in the present work. Based on the critically reviewed thermodynamic properties and phase diagram data from the literature and the present work, the Sc–Si system was assessed by means of the CALPHAD (CALculation of PHAse Diagram) approach. The Gibbs energies of solution phases, Liquid, (αSc), (βSc), and (Si), were modeled by the Redlich–Kister polynomial. All the intermetallic compounds, Sc5Si3, ScSi, αSc3Si5, and βSc3Si5, were described as stoichiometric phases. Finally, a set of self-consistent thermodynamic parameters for the Sc–Si system was obtained. The calculated phase diagram and thermodynamic properties agree well with the available experimental data.
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