Rate of Self-Diffusion in Tin Crystals

Abstract

IN non-cubic crystals the rate of self-diffusion can be expected to depend on the crystallographic direction parallel to which the diffusion is measured. Although the determination of this anisotropy is of interest for the theory of diffusion, experiments have so far only been carried out on bismuth¹ and zinc² crystals. The measurements made on zinc are not of high accuracy and their evaluation is open to doubt. The relation between the diffusion coefficient measured in a direction at an angle 0 to the principal axis and the diffusion coefficients parallel (D_c) and at right angles (D_α) to this axis is .