Self-diffusion studies at extended diffusion anneal times and impurity (phenanthrene) diffusion studies in melt-grown anthracene crystals have shown evidence for a fast subgrain-boundary-diffusion process in addition to a much slower lattice diffusion. Subgrain boundary diffusion is faster by a factor of 106−107, the activation energy being 25% to 66% the value for lattice diffusion. Phenanthrene diffusion is very similar to self-diffusion in terms of diffusivity magnitude and activation energy. Diffusion anisotropy is more marked for phenanthrene diffusion, diffusivity perpendicular to the ac plane being greater than that perpendicular to the ab plane.
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Reucroft et al. (1966) studied this question.
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