Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc-Si system

作者：Qin A; Liu D; Chen C; Liu S; Du Y; Wang M; Nash P

来源：Journal of Thermal Analysis and Calorimetry, 2015, 119(2): 1315-1321.

DOI：10.1007/s10973-014-4216-2

• Calorimetry
• CALPHAD
• Heat content
• Phase diagram
• Sc-Si

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.

• 单位
  Illinois Institute of Technology; United States