A thermodynamic description of the Pd–Si–C system

The Pd–Si–C system was critically assessed by means of the CALPHAD technique. The solution phases (liquid, face-centered cubic, graphite and diamond) were modeled with the Redlich–Kister equation. The compounds Pd21Si4, αPd2Si and βPd2Si, which have a homogeneity range, were treated as the formulae (Pd, Si)21Si4, α(Pd, Si)2Si and β(Pd, Si)2Si by a 2-sublattice model with Pd and Si on the first sublattice, Si on the second one, respectively. The intermetallic compounds, Pd5Si, Pd3Si, Pd9Si2, Pd14Si3, PdSi, Pd39Si20, Pd19Si10, Pd15Si4 in the Pd–Si system and SiC in the Si–C system were treated as stoichiometric compounds. A set of self-consistent thermodynamic parameters of the Pd–Si–C system was obtained.