The effect of O upon the surface self-diffusion coefficient was studied by using the grain boundary grooving method. The data for an O partial pressure of 10-11Pa, at 973 to 1073K, were described by:

D (cm2/s) = 2.49 x 103 exp[-39.5(kcal/mol)/RT]

The data for an O partial pressure of 105Pa, at 973 to 1073K, were described by:

D (cm2/s) = 1.71 x 101 exp[-25.2(kcal/mol)/RT]

K.Yoshihara, K.Nii: Transactions of the Japan Institute of Metals, 1979, 20[9], 533-42