The diffusive behavior of W in 3N5-purity material was studied at 1100 to 2400K. The results could be described by:

D (cm2/s) = 4.1 x 10-3 exp[-9.0(kcal/g-atom)/RT]

R.Frauenfelder: Journal of Vacuum Science and Technology, 1996, 6[3], 388-97

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)