Thermodynamic assessment of the La-Mg system

A thermodynamic modeling and optimization of the La-Mg system is carried out by means of the CALPHAD method taking into account the latest experimental results. The liquid, bcc-La, fcc-La, dhcp-La and hcp-Mg solutions are modeled as substitutional solutions (La, Mg) using the Redlich-Kister formalism. The LaMg, LaMg₂, La₅Mg₄₁, La₂Mg₁₇ and LaMg₁₂ phases are treated as stoichiometric compounds, and the non-stoichiometry of LaMg₃ is described as (La,Mg)_0.25Mg_0.75. The results are in good agreement with the set of experimental data which were carefully discussed and selected.