Abstract
Electromotive forces of the liquid alloys of Mg+Pb and Mg+Sn against pure liquid Mg were measured using galvanic cells of the type in the temperature range 700 to 900 °C. The activities and the relative partial molar properties of Mg and Pb in the system Mg+Pb and of Mg and Sn in the system Mg+Sn and the relative integral molar properties of the liquid alloys of Mg+Pb and Mg+Sn at 800 °C were determined from the measured values of the electromotive force. Gibbs energies, enthalpies, and entropies of formation for solid Mg 2Pb and Mg 2Sn were calculated using the relevant results from this investigation and from the established equilibrium phase diagrams of Mg+Pb and Mg+Sn. The activity coefficients of Mg and Pb in Mg+Pb and of Mg and Sn in Mg+Sn, were found to agree qualitatively with those calculated from the application of the quasi-idealsolution model to the melts assuming the formation of Mg 2Pb, MgPb and Mg 2Sn, MgSn in the respective systems.
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