Thermodynamic Activity of Liquid Zn–Cd Alloys Studied by EMF Method with Zirconia Solid Electrolyte

Abstract

The E.M.F. of the galvanic cell with zirconia solid electrolytes was measured to determine the activities of zinc at 800-900 K over the entire composition range of liquid Zn-Cd alloys, and some thermodynamic functions were derived from the results. The cell used was as follows: (-) W|Zn, Zno|Zro 2 (+Y 2 O 3 )|Zn-Cd(l), ZnO|W (+). The activities of zinc in the alloys at 800 and 900 K show moderately positive deviations from Raoult's law over the whole composition range. They are compared with the literature data. The results were used to calculate the concentration fluctuations in long wavelength limit in the liquid alloys.