It was found that data for 1125 to 1312C could be described by:

D (cm2/s) = 2.56 x 100 exp[-3.88(eV)/kT]

P.S.Raju, N.R.K.Rao, E.V.K.Rao: Indian Journal of Pure and Applied Physics, 1964, 2[11], 353-5