Thermodynamic description of the part of Sn-Ti phase diagram is presented using the CALPHAD approach. The thermodynamic parameters of the some phases of system modifying according new experimental phase equilibrium and thermodynamic data. Some phases described as stoichiometric, but another with sublattice models. Ti3Sn, TI5Sn3, TI6Sn5 are modelled with three sublattice modes. Better agreement is obtained by the present optimization. Calculated results are compared with the original experimental data to demonstrate the successfulness of this assessment. The enthalpies of formation of solid phases are calculated and compared by two methods.
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