THE THERMODYNAMIC ACTIVITIES OF SILVER IN LIQUID SILVER COPPER GERMANIUM ALLOYS

The time-of-flight mass spectrometer was used to determine the thermod ynamic activities of silver of ternary Ag-Cu-Ge liquid alloys at 1416 K. The ion intensities of silver for 119 different compositions in the system Ag-Cu-Ge were measured. The mole fractions ranged from 0.105 t o 1.000 for silver, 0.018 to 0.735 for copper, and 0.048 to 0.690 for germanium. The activities of copper and germanium in the liquid Ag-Cu- Ge alloys were calculated by the Gibbs-Duhem integration of activities of silver. The thermodynamic activities of liquid Ag-Cu-Ge alloys sho w regular solution behavior at 1416 K.