Abstract
Thermodynamic modelling of the Pb–Yb binary system was carried out with the help of the CALPHAD method. The liquid phase has been described with the association solution model with ‘ Pb 1Y b 2’ as an associated complex. The solution phases BCC_A2 and FCC_A1 were modelled with the sublattice formalism. The α PbYb_LT and β PbYb_HT Pb sub-stoichiometric intermetallic compounds, which have a homogeneity range, were treated with the formula (Pb,Y b) 0.5(Y b) 0.5 by a two-sublattice model with Pb and Yb on the first sublattice and Yb on the second one. Pb 3Y b, Pb 3Y b 5 and PbY b 2 have been treated as stoichiometric compounds. The calculations based on the thermodynamic modelling are in good agreement with the phase diagram data and experimental thermodynamic values.
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