Abstract
The electromigration in the steady-state mode and anisotropic diffusion of $^{63}\mathrm{Ni}$ in single-crystal $\ensuremath{\beta}$-tin have been measured by a tracer-sectioning technique. For the first time the solubility of Ni in Sn has been observed. The unusual features are extremely rapid mobility, low activation energies, and extraordinary anisotropy of diffusion ($\frac{{D}_{\ensuremath{\parallel}}}{{D}_{\ensuremath{\perp}}}=7\ifmmode\times\else\texttimes\fi{}{10}^{4}$). The strength of the electromigration driving force in the basal plane of Sn shows a surprisingly strong temperature dependence.
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