The electrochemical properties of Np, dissolved in LiCl-KCl eutectic, were investigated using cyclic voltammetry and chronopotentiometry. At 400 to 550C, the diffusion coefficients of Np3+ and Np4+ were of similar magnitude and were described by:

D(cm2/s) = 9.47 x 10-4exp[-23600/RT]

and

D(cm2/s) = 2.14 x 10-4exp[-14100/RT]

respectively.

P.Masset, C.Apostolidis, R.J.M.Konings, R.Malmbeck, J.Rebizant, J.Serp, J.P.Glatz: Journal of Electroanalytical Chemistry, 2007, 603[2], 166-74