The diffusivity of N in γ-Fe was determined at 900 to 1100C by measuring de-nitrogenation in H (using a microbalance), after nitrogenation. The N diffusivities could be described by:

D (cm2/s) = 7.0 x 10-1 exp[-39.5(kcal/mol)/RT]

H.J.Grabke, E.M.Petersen: Scripta Metallurgica, 1978, 12[12], 1111-4