Self-diffusion in tungsten single crystals has been measured over the temperature range 1700-3400 K (encompassing a range of nine orders of magnitude in the diffusion coefficient D). The plot of lnD vs 1/T is curved, and can be fitted by a sum of two exponentials, D=0.04exp(-5.4₅eVkT)+46exp(-6.9×eV/kT) cm² sec^-1, the first of which probably represents diffusion by single vacancies.
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Mundy et al. (1978) studied this question.
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