Abstract
The measurement of electromotive force (EMF) of concentration cells was applied to obtain zinc activity in ternary liquid Sb-Sn-Zn alloys in a Znliq|(KCl-LiCl)eut + ZnCl2|(Sb-Sn-Zn)liq galvanic cell. The measurements were carried out at temperatures from 723 up to 943 K for different Zn concentrations X Zn and for five constant ratios of Sn to Sb mole fractions, which were 1/3, 1, 3, 4 and 9. It was found out, that with increasing Sn concentration in the ternary alloys, the activity of Zn grew reaching the highest values for alloys of ratio Sn/Sb = 9 out of the ternary alloys examined. The observed straight-line changes of EMF matched a EMF = A + B * T equation. The calculated coefficients served to obtain the activities and excess Gibbs free energy for selected temperatures 823 and 923 K.
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