The isotope effect for the diffusion of Na+ in Harshaw NaCl crystals was measured at 589 to 796C. The diffusion coefficients of Na+ in NaCl were described by:

D(cm2/s) = 7.7 exp[-2.04(eV)/kT]

S.J.Rothman, N.L.Peterson, A.L.Laskar, L.C.Robinson: Journal of Physics and Chemistry of Solids, 1972, 33[5], 1061-9