Thermodynamic properties of alloys of praseodymium with the gallium-indium eutectic melt

Equilibrium potentials of Pr-In alloys containing 8.7–12.1 mol % Pr and alloys of Pr with In-Ga eutectic saturated by praseodymium up to 6.71 mol % Pr are measured by the emf method between 573–1073 K in the (Li-K-Cs)Cleut based salt melt. Metallic praseodymium is used as the reference electrode when studying the Pr-In system, and the two-phase praseodymium-indium alloy L + PrIn3 with the known thermodynamic properties having no phase transitions in the studied temperature range is used as the reference electrode when studying the Pr-In-Ga system. Partial thermodynamic properties and activity of praseodymium in alloys with indium and the Ga-In eutectic mixture are calculated.