Thermodynamic assessment of the Cd–X (X=Sn, Mn, Fe) systems

The experimental data on phase equilibria and thermodynamic properties of the Cd–X (X=Sn, Mn, Fe) systems in literature was assessed by the means of the CALculation of PHAse Diagram (CALPHAD) method. The solution phases were modeled with the Redlich–Kister polynomial. Gas phase was treated as an ideal gas mixture of species Cd and Mn, Fe and Fe2. In the Cd–Sn system, the (Cd) and β phases show the same structure (hexagonal). However, a distinction between both phases was made as the c/a ratio of β was considerably different from that of the (Cd) structure. A set of self-consistent thermodynamic parameters for Cd–X (X=Sn, Mn, Fe) systems was obtained. Comparisons between the calculated and measured phase diagram as well as the thermodynamic properties show that the experimental information can be satisfactorily accounted for by the present thermodynamic descriptions.