MEASUREMENT OF THE STANDARD POTENTIAL OF THE CE CE3+ COUPLE IN (LITHIUM-CHLORIDE PLUS POTASSIUM-CHLORIDE) EUTECTIC MELT/

The standard electrochemical potential of the Ce/Ce3+ couple in fused (lithium chloride + potassium chloride) eutectic was measured as a fun ction of temperature in the range 673 K to 773 K by a high-temperature galvanic cell technique using the reversible concentration cell: Ta,C e parallel to x(CeCl3) + (1-x)(0.59 LiCl + 0.41 KCl)/y(AgCl) + (1-y)(0 .59 LiCl + 0.41 KCl)parallel to Ag,Ta. The molar Gibbs free energy of formation of CeCl3 and the activity coefficient of CeCl3 at infinite d ilution of CeCl3 in the (lithium chloride + potassium chloride) eutect ic melt were calculated from the e.m.f. results and auxiliary informat ion from the literature. The results obtained agree satisfactorily wit h the reported values. (C) 1996 Academic Press Limited