Abstract

The thermodynamic properties of low-level Pr dissolved in liquid Bi were determined by means of the electromotive force (EMF) measurement method using a cell consisting of molten chloride and liquid Bi at temperature ranging from 810K to 1110K. A considerable increase of the activity coefficient with temperature was observed. The molar excess formation free energy, the excess enthalpy change, and the excess entropy change of Pr dissolved in Bi have been deduced. The heat of formation of liquid Pr–Bi alloys (ΔHPr–BiM) was deduced from the measured activity coefficient at varied concentrations. There is a linear dependence of experimental ΔHPr–BiM on the Pr concentrations.

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