Thermochemical characteristics of interaction of calcium with gadolinium chlorides in melts

To prepare gadolinium by thermal reduction the enthalpies ΔH1133 of calcium interaction with gadolinium chloride in the melt and in solution with KCl, constituting -187.8 and -166.0 kJ/mol GdCl3 respectively, are determined. With the temperature increase ΔH values decrease. Formation enthalpies of solutions at 890 deg C by gadolinium chlorides with calcium and potassium chlorides which for infinitely diluted solutions constitute 48.0 kJ/mol CaCl2 and -54.0 kJ/mol KCl are determined. With the increase of CaCl2 concentration in solution to equimolar composition ΔH values decrease to 9.2 kJ/mol CaCl2, and in the system with KCl of the composition (GdCl3+3KCl) - to -25.0 kJ/mol KCl. Effect of CaCl2 and KCl on the main process procedure is considered