Polycrystalline samples of α-phase material, having O contents of up to 2.35at%, were prepared. The Fe diffusivity was measured by using 59Fe radiotracer and serial sectioning methods at 875 to 1125K. It was found that the results could be described by:

0.74at%O:     D (cm2/s) = 3.1 x 10-2 exp[-33.1(kcal/mol)/RT]

1.52at%O:     D (cm2/s) = 2.1 x 10-2 exp[-32.1(kcal/mol)/RT]

2.35at%O:     D (cm2/s) = 2.3 x 10-2 exp[-32.5(kcal/mol)/RT]

H.Nakajima, M.Ohno, S.Yamaguchi, M.Koiwa: Scripta Metallurgica, 1988, 22[9], 1455-8