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which is very similar to the rate by Coble, compares well with the lattice diffusion model by Herring, and agrees with experimental results. If the grain size is approximately an order of magnitude larger than the thickness within which diffusion is enhanced, Eq. (12) provides very good agreement with experimental results. If the grain sizes are on the order of the apparent widths of boundaries deducted from measurements, the lattice model should be used.
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Choi et al. (1994) studied this question.
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