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