The bulk diffusion of 63Ni at 88 to 220C was reported (tables 225 to 227). Due to the low solubility of Ni in Pb, Fick’s solution corresponding to the boundary condition - of a constant solute concentration at the surface - was used. The differing behaviors of the Ni depth profile concentration in pure Pb and saturated Pb-Ni solid solutions suggested a strong Ni-Ni interaction, leading to the formation of less mobile dimers near to the surface of pure Pb. The Decker model for the diminution of Au diffusivity in Pb-Au solid solutions yielded an enthalpy of 9.5kcal/mol and an entropy of 0.9k for Ni-Ni substitutional dimers.

H.Amenzou-Badrour, G.Moya, J.Bernardini: Acta Metallurgica, 1988, 36[3], 767-74

Table 226

Diffusivities, DPbNi, in Pure Pb

Table 227

Diffusivities, PbPbNiNi in Pb-Ni

Saturated Solid Solutions