Abstract
The thermodynamic activities of mercury in liquid Hg-Tl and Hg-Pb alloys were determined at 284 ° and 423 °C by a vapor pressure comparison method. A thermodynamic analysis of the results, using known enthalpies of mixing, yielded values of excess entropies which are either positive or negative in the system mercury-lead in the entire concentration region. A systematic analysis of thermodynamic data of all binary mercury systems investigated to date led to the conclusion that in addition to the chemical bonding conditions an atomic misfit in the liquid alloys dependent on the difference in atomic radii of the alloy components has an appreciable effect on the enthalpies of mixing. An analogous misfit contribution to excess entropy could not be shown. It is probably cancelled out by the effect of the individual bonding conditions on the Δ S ex values in the mercury systems under consideration.
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