The diffusive behavior of W on 3N-purity polycrystalline specimens was studied by using the multiple-scratch technique at 1600 to 2300C. The results could be described by:

D (cm2/s) = 2.0 x 10-1 exp[-53.2(kcal/mol)/RT]

L.Ho-Yi: Jernkontorets Annaler, 1967, 151, 801-21

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)