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diffusion coefficient at 300 K is on the order of 10¨C13 m2/s,
and at 200 K on the order of 10¨C17 m2/s. This means that a hydrogen
atom can diffuse over a distance of roughly 1 lm/s at
300 K,and 10 nm/s at 200 K.

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x^2 = 6*D*t  ²Î¿¼G. Gottstein, Physical foundations of materials science, P176, Eq. 5.36.
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