Polycrystalline samples were implanted with 40keV 15N ions, to doses of 1.8 x 1020 or 1.2 x 1021/m2, and annealed at 500 to 700C. The depth profiles were deduced from the broadening of the (p, α-γ) resonance. It was found that the results could be described by:

D (cm2/s) = 5.6 x 10-1 exp[-2.50(eV)/kT]

A.Anttila, J.Räisänen, J.Keinonen: Journal of the Less Common Metals, 1984, 96, 257-62