THERMODYNAMIC ACTIVITY IN LIQUID GA-SN ALLOYS STUDIED BY EMF METHOD

The E.M.F. of a galvanic cell with the zirconia solid electrolyte was measured to determine the activities of gallium at 1000-1200 K in the entire composition range of liquid Oa-Sn alloys, and some thermodynami c functions were derived from the results. The fell used was as follow s: (-)W\Ga, Ga2O3\ZrO2(+ Y2O3)\Ga-Sn(I), Ga2O3/W(+). The activities of gallium in liquid Ga-Sn alloys at 1000 and 1200 K showed moderately p ositive deviations from Raoult's law in the whole composition range. T he results were used to obtain the tin activity, the activity coeffici ent of gallium at infinitely dilute solution of tin, and the concentra tion fluctuation in long wavelength limit in the liquid alloys.