Abstract
The molar volumes VM and the thermal expansion coefficients alpha p of liquid Hg-In and Hg-Sn alloys were measured as detailed functions of composition in the range of dilute solute (In or Sn) concentration (below 15 at.% In and 10 at.% Sn). The excess molar volume Delta VM for each kind of alloy decreases monotonically with increasing concentration of solute (In or Sn) atoms. On the other hand, the concentration dependences of alpha p differ; a slight hump exists at a few at.% In for liquid Hg-In alloys, while no anomalous behaviour of alpha p is found for liquid Hg-Sn alloys. These results are closely related to the fact that there is a minimum in the curve of the thermoelectric power Q plotted against concentration for Hg-In but not for Hg-Sn, and appear to show the importance of higher-order correlation effects in liquid Hg-In alloys. It is also pointed out that similar anomalies can be found in the literature values of the partial molar excess entropy of solute component in liquid Hg-In and Hg-Tl systems.