The chronopotentiometric method was used to study the reaction, UIV + e → UIII, in molten 50 or 38.2mol%AlCl3 mixtures. At 250 to 400C (table 139), the activation energy for diffusion in the 50mol%AlCl3 mixture was calculated to be 5.4kcal/mol, while that for the 38.2mol%AlCl3 mixture was 4.1kcal/mol.

Electrochemical Behaviour of U(IV) in NaCl-AlCl3 Melts. L.Martinot, T.Gerard, G.Duyckaerts: Inorganic and Nuclear Chemistry Letters, 1973, 9, 657-65