It was found that the Ge diffusivity at between 1150 and 1350C could be described by:

D(cm2/s) = 6.26 x 105exp[-5.28(eV)/kT]

D.A.Petrov, Y.M.Shaskov, I.P.Akimchenko: Vosprosy Met. Fiz. Poluprovodnikov, 1957, 130