Abstract
The Gallium-Erbium binary system was studied using the CALPHAD method (calculation of the phase diagram) and on the basis of phase diagrams, thermodynamic properties and experimental parameters. The Ga-Er binary system contains six intermetallic compounds: Ga6Er, Ga3Er, Ga2Er, Ga5Er3, GaEr and Ga3Er5. All these phases have been treated as stoichiometric compounds. The liquid phase has been described with the association solution model with “Ga1Er1” as associated complex. Our calculated results are in good agreement with the equilibria between phase and the experimental thermodyanmic parameters drawn from the literature. Our optimizations allowed us to reproduce the phase diagram, and to calculate for the first time the enthalpies of formation and the entropies of formation of the liquid phase and the intermetallic compounds.
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