The non-linear enhancement of solvent diffusion by Sn was measured (table 210) at 1330 to 1470K, using 59Co rather than  a Ni tracer. By using a suitable model, vacancy-impurity binding free enthalpies of about –0.20eV were estimated from the enhancement factors.

F.Faupel, C.Kostler, K.Bierbaum, T.Hehenkamp: Journal of Physics F, 1988, 18[2], 205-12

Figure 36

Interdiffusion in Ni-Pd

(a: 1200C, b: 1100C, c: 1050C, d: 1000C, e: 900C)