A capillary reservoir method was used to study diffusion in eutectic melts, with 213U as a tracer and with U concentrations of 1wt% (table 80). The data for UCl4, at temperatures ranging from 370 to 607C, could be described by:

D (cm2/s) = 1.13 x 10-3 exp[-6.3(kcal/mol)/RT]

Diffusion of U-233 in Eutectic LiCl-KCl Melts. E.Geldner, O.Knacke, F.Müller: Zeitschrift für Anorganische und Allgemeine Chemie, 1970, 372[1], 14-20