The diffusion O was studied, under various O partial pressures in Ar, at 973 to 1073K. The results could be described by:

PO2 = 10-11Pa:     D (cm2/s) = 2.49 x 103 exp[-39.5(kcal/mol)/RT]

PO2 = 105Pa:     D (cm2/s) = 1.71 x 100 exp[-6(kcal/mol)/RT]

K.Yoshihara, K.Nii: Journal of the Japan Institute of Metals, 1978, 42[5], 492-8