Abstract
The Pd–Sb binary system has been thermodynamically assessed by means of CALPHAD approach. The Redlich–Kister polynomial was used to describe the solution phases, liquid (L) and fcc. The non-stoichiometric compound Pd 3Sb and Pd 5Sb 3 were described by a two-sublattice model (Pd,Sb) 3Sb and (Pd,Sb) 5(Pd,Sb) 3. The six intermetallic compounds, Pd 8Sb 3, Pd 20Sb 7, Pd 5Sb 2, Pd 2Sb, PdSb and PdSb 2, were treated as stoichiometric phases. The parameters of the Gibbs energy expressions were optimized according to all the available experimental information of both the equilibrium data and the thermodynamic results. A set of self-consistent thermodynamic parameters of the Pd–Sb system has been obtained. The calculations agree well with the respective experimental data.
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