Chemistry, 10.07.2019 20:20, random286

Diffusion in a polycrystalline material is generally faster along a free surface than through the grain interior because (a) the effective vacancy concentration is generally greater on the surface (b) concentration gradients (c) the activation energy for diffusion is usually greater on the surface (d) all of the above generally greater on the surface are

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Diffusion in a polycrystalline material is generally faster along a free surface than through the gr...