The boiling-point method was used to determine the vapor pressure of cadmium over ternary liquid alloys with silver and copper at concentration ratios of 0.5 and 2.0 at T= 873-1273 K. Partial and integral ther-modynamic characteristics of temperature vs. concentration were obtained for the vapor and condensed phases. The system is characterized by a negative departure from law of ideal solutions. Using data on the boundary systems Ag-Cd and Cu-Cd, the component vapor-pressure functions were extrapolated to the high-temperature region to obtain the liquid-vapor transformation boundaries of the Ag-Cu-Cd system. The region of vapor-alloy coexistence has an upper limit at a relatively small zone where liquid silver-copper-cadmium solutions exist.
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