Abstract
Activity and partial free energy of mixing of tin in the molten Pb-Sn-Ag system were determined at 1073 K along three pseudobinary lines of fixedX Ag/X Pb ratios by the electromotive force method. The cell employed was Sn(l), SnO2(s)/Calcia stabilized zirconia/Sn(alloy), SnO2(s). Excess integral free energy of mixing (F ter E ) and the activities of lead and silver were calculated by the Darken’s method. The values when extrapolated toX Sn=0 agreed reasonably well with the literature data on the Pb-Ag binary. Error analysis revealed that the inconsistencies in the reported data arose as a result of the uncertainties inherently present in the integration and differentiation steps. A crosscheck onF ter E corroborated the above observation.F ter E were also calculated from the data on the bounding binaries by the method of Olson and Toop. Except in the silver-rich corner the predicted values were within 50 calories of those obtained from the experimental data.
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