Abstract
With the help of a simple, high-temperature calorimeter the integral enthalpies of mixing of liquid gallium-mercury alloys were determined. The maximum value for the enthalpy of mixing is 370 cal/g-atom. The values obtained lead, on the basis of an evaluation of the phase equilibria of the system gallium-mercury, to negative excess entropies in spite of the strong de-mixing tendency that was present. Further, the thermodynamic activities of liquid gallium-zinc alloys were determined using a comparative vapour pressure method. The results of the activity measurements and a thermodynamic evaluation of phase equilibria of the system gallium-zinc made a comprehensive thermodynamic analysis of this system possible. The excess entropies were positive; the maximum value is 0.3 cal/g-atom °K. The influences of differences in atomic radii, and the forces of chemical interaction, on the thermodynamic characteristics of liquid alloys are discussed and the exceptional position of the mercury systems of binary alloys with B metals, which arises from exceptional bonding relationships, is pointed out.
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