The self-diffusion of potassium in a molten LiF-NaF-KF (46.5:11.5:42.0mol%) eutectic mixture was measured by using the capillary reservoir technique and the tracer, 42K. The self-diffusion at 491 to 613C was described by:

D(m2/s) = 2.05 x 10-7 exp[-32.0(kJ/mol)/RT]

N.Umesaki, N.Iwamoto, Y.Tsunawaki, H.Ohno, K.Furukawa: Journal of the Chemical Society - Faraday Transactions 1, 1981, 77[1], 169-75