The diffusive behavior of 186Re was studied at 2100 to 2400C. The results could be described by:

D (cm2/s) = 1.95 x 101 exp[-141(kcal/mol)/RT]

L.N.Larikov, V.M.Tyshkevich, L.F.Chorna: Ukrayinskyi Fizychnyi Zhurnal, 1967, 12[6], 983-7