The diffusive behavior of 99Mo was studied. The results could be described by:

polycrystalline (2100-2400C):     D (cm2/s) = 3.7 x 10-3 exp[-110.0(kcal/mol)/RT]

monocrystalline (2000-2400C):     D (cm2/s) = 5.0 x 10-2 exp[-121.0(kcal/mol)/RT]

V.D.Lyubimov, P.V.Geld, G.P.Shveikin, Y.A.Sutina: Izvestiya Akademii Nauk SSSR, 1967, 2, 84-7

The best linear fits to the solute diffusion data ([5] to [25]) yield:

H (sd): Ln[Do] = 1.49E – 21 (R2 = 0.87); W(sd): Ln[Do] = 0.33E – 16.1 (R2 = 0.63)