Thermodynamic investigations of Sn–Zn–Ga liquid solutions

Activity of zinc in liquid Sn–Zn–Ga alloys has been measured by electrochemical technique based on molten salt electrolyte galvanic cell in the temperature range 723–823 K along three pseudo-binary lines of Znx(SnyGa1−y)1−x where y = 0.75, 0.50 and 0.25. The excess molar free energy, enthalpy and entropy have been computed by the Darkenʹs treatment of the ternary solutions using published data of the relevant binary solutions and ternary system investigated. Slope–intercept method has been used to compute the partial molar quantities. The activities of tin and gallium are computed from the partial molar excess free energies of three components at 750 K. The activities of all the three components show positive deviation from the Raoultʹs law. Thermodynamic properties of Sn–Ga binary system have been predicted at 750 K from the ternary data and compared with those published in the literature.