The activity of zinc was measured in a series of liquid alloys in the three
ternary systems, Ag-Sn-Zn [94Kar], Au-Sn-Zn [96Kar] and Cu-Sn-Zn [97Pen],
with an emf (electromotive force) method. From these measurements and the s
lope of the emf vs. temperature (dE/dT) all thermodynamic properties were d
erived. The experimental values were compared with calculated results. For
these calculations four different models were applied and the thermodynamic
data of the binary systems, obtained from the literature, were used.