The volume diffusion of Ni in various alloys, at 1193 to 1513K, could be described by:

5wt%Ni:     D (cm2/s) = 1.5 x 10-2 exp[-57.6(kcal/mol)/RT]

10wt%Ni:     D (cm2/s) = 1.9 x 10-2 exp[-58.1(kcal/mol)/RT]

15wt%Ni:     D (cm2/s) = 2.8 x 10-1 exp[-64.6(kcal/mol)/RT]

20wt%Ni:     D (cm2/s) = 8.0 x 10-1 exp[-67.3(kcal/mol)/RT]

It was suggested that vacancy-solute interactions were important.

G.Henry, G.Cizeron: Annales de Chimie, 1978, 3[3], 167-76