Relationships were derived for the calculation of surface diffusion coefficients from macroscopic mass transfer data. By applying these relationships to experimental results on the coalescence of dispersed drops of Au on the (100) surfaces of monocrystalline NaCl, a value of 10-16cm2/s was obtained for the surface heterodiffusion coefficient of Au on NaCl at 280C. For temperatures ranging from 240 to 500C, the data could be described by:

D (cm2/s) = 10-11 exp[-14(kcal/mol)/RT]

Y.E.Geguzin, Y.S.Kaganovskii, V.V.Slyozov: Journal of the Physics and Chemistry of Solids, 1969, 30[5], 1173-80 and Y.E.Geguzin, Y.S.Kaganovskii, V.V.Kalinin: Fizika Tverdogo Tela, 1969, 11[1], 250-2