Experimental study on gallium activity in the liquid Ga-Bi-Sn alloys using the EMF method with zirconia solid electrolyte

The EMF of galvanic cells with zirconia solid electrolytes was measured to determine the activity of gallium in liquid Ga-Bi-Sn alloys in the temperature range of 1000-1250 K along three pseudo-binary lines of (BiySn1-y)-Ga where y = 0.25, 0.50 and 0.75. A mixture of Ga and Ga2O3 was used as a reference electrode. The activity curves of Ga show positive deviations from ideality in the whole composition range. The excess free energies of mixing for Ga-Bi-Sn alloys have been calculated using the general solution model in the same temperature range and along same pseudo-binary lines. The gallium activities obtained by the EMF method and calculated using the general solution model at 1100 K were compared with literature data.