The diffusivity of 30Si in the bulk of high-purity β-type polycrystalline material was determined at 2283 to 2547K. The data could be described by:

D (cm2/s) = 8.36 x 107 exp[-9.45(eV)/kT]

M.H.Hon, R.F.Davis, D.E.Newbury: Journal of Materials Science, 1980, 15[8], 2073-80