The PbX (X=S,Se,Te) system has been thermodynamically assessed. The individual binaries of the PbX system have been assessed using a two-sublattice model to describe the intrinsic carriers of the system. The 2SL model has been used to model the pseudobinaries and pseudoternary in this system as well. Na doping in the individual PbX compounds has also been taken into account using experimental and DFT data.
