The diffusive behavior of Al in 6N-purity material was studied at 85 to 209C. The results could be described by:

D (cm2/s) = 1.76 x 10-1 exp[-1.31(eV)/kT]

T.E.Volin, R.W.Balluffi: Physica Status Solidi, 1968, 25[1], 163-73