Abstract
Thermodynamic properties of Pb-Sb alloys containing 20–95 mol % Pb are investigated by the method of measurement of equilibrium emf values in the range T = 723–873 K in a molten mixture of potassium and lead chlorides. The partial and integral thermodynamic characteristics of the system are calculated, and small negative deviations from ideality are revealed. The extremum of integral functions of mixing lies in the region of 0.55 mole fraction of Pb. The system could not be treated as a regular solution since the excess entropy introduces a considerable contribution to deviation from ideality, while the excess Gibbs energy differs considerably from the heat of mixing.
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