Optimization of the Na-Tl System

The Na-Tl system was thermodynamically optimized by using Lukas's software. The liquid phase, the hcp and the bcc solid solution of Tl are described by Redlich-Kister polynomials with three terms for enthalpy and entropy each. For the phase Na-Tl the Wagner-Schottky model was chosen with antistructure atoms on the Na as well as on the Tl sublattice. The remaining phases, Na6Tl, Na2Tl and NaTl2 are treated as stoichiometric phases.