THERMODYNAMIC STUDY OF THE SILVER-RICH AG-CU SOLID-SOLUTION

Using a zirconia solid electrolyte and separate gas chambers around the electrodes, a reproducible EMF as a function of temperature was obtained with following cell. -Pt\Cu, Cu2O\ZrO2-electrolyte\Ag-Cu, Cu2O\Pt+ The EMF for several compositions of Ag-Cu alloys in the solid solution was measured. The thermodynamic activities of both components as well as the partial and integral molar quantities were determined. All activities showed a large positive deviation from Raoult's law, this implies a demixing tendency in this system. The maximum solubility of Cu in solid Ag at 1053 K was determined as 13.0(+/- 0.5) mol% by extrapolation.