Diffusion of gallium along small-angle grain boundaries in germanium

Abstract

Diffusion profiles of gallium in germanium containing a small-angle symmetric tilt boundary have been determined as a function of temperature and misorientation angle. The observed diffusion tails cannot be described in terms of the phono-monological pipe diffusion or grain-boundary diffusion models. The results may be understood by diffusion along a second phase, containing Ge, which forms around the dislocations, and in which the solubility of gallium is about 10² 10³ times that in the unperturbed germanium matrix.