Abstract
The surface energy and entropy of liquid Ga–Bi and Ga–Pb alloys have beenstudied by means of surface light scattering measurements at various compositionsand temperatures between the respective eutectic and monotectic points. Analysisof these results using the Gibbs adsorption equation gives evidence for wettingand prewetting transitions in these alloys completely consistent with a tetra-pointwetting scenario (Dietrich S and Schick M 1997 Surf. Sci. 382 178). Surfacefreezing transitions are observed for conditions near the liquidus curves. In viewof their viscoelastic properties and their relation with the wetting filmcharacteristics, we suggest a simple explanation for the observed surface freezingphenomena in terms of nucleation of strongly undercooled wetting films.
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