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Thermodynamic properties of liquid copper-rich Cu-Pb alloys

On the basis of measurements of the vaporization rate of dilute Pb solutions in liquid copper by the K n u d s e n effusion method and supplementary literature data concerning the position of the liquidus curve in the Cu-Pb system together with pointwise data on the vapour pressure of lead in the range of temperatures between 907 to 1132 K, the temperature dependence of vapour pressure of lead in the range of temperatures between 907 to 1524 K and thermodynamic activities of the components of the binary system for temperatures between 1361 and 1524 K and Pb contents from 0.083 to 4.048 mole % were determined. The results made it possible to calculate standard enthalpy of Pb sublimation and molar enthalpy of mixing for dilute lead solutions in liquid copper, and also to estimate the temperature dependence of the activity coefficient of lead in the state of infinite dilution and the first-order interaction parameter e Pb Pb . The results were evaluated by comparison with the available literature data.