Thermodynamic evaluation of the germanium-tellurium system

In order to optimize the binary Ge-Te system available experimental data we re critically compiled from the literature. The cubic high-temperature beta -phase and the rhomboedric room-temperature alpha-phase were described by a two-sublattice model with one kind of defect (vacancies on germanium sites ). The room-temperature orthorhombic gamma-phase was treated as a stoichiom etric compound. as there is a lack of information about its solubility. The liquid phase as modelled by the the associate model with one kind of assoc iate, namely 'GeTe'. A set of thermodynamic parameters was obtained and the calculated phase diagram is presented.