Abstract
The partial vapor pressures of BiI 3 over liquid BiBiI 3 solutions were determined in the temperature range from 400 to 540°C by a modified dew point method. The thermodynamic activities of BiI 3 show strong positive deviations from Raoult's law at high bismuth content and slight negative deviations at high BiI 3 concentrations. The enthalpies of mixing obtained calorimetrically show a tendency to compound formation at high salt contents (negative enthalpy of mixing up to −200 cal/mole) whereas a clearly defined tendency to demixing is expressed in the positive enthalpies of mixing (up to 1700 cal/mole) at high metal concentration. The entropies of mixing show an analogous dependence on the concentration. The heat contents and enthalpies of melting of BiI 3 and of bismuth, which are necessary for the determination of the enthalpies of mixing, were determined too.
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