Non steady-state O diffusion in the specimen was produced by applying a potential between the reference and specimen electrodes, and was monitored by measuring time-dependent potentials and currents. The results for 850 to 1400C could be described by:

D (cm2/s) = 4.9 x 10-2 exp[-39.1(kcal/mol)/RT]

J.W.Park, C.J.Altstetter: Metallurgical Transactions A, 1987, 18[1], 43-50