5.6 - volume In general Q volume> Q grain boundary> Q...

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RT Q o e D D - = In this equation Q is the activation energy of diffusion and will depend on the diffusion mechanism – whether it is vacancy migration or random walk. It will also depend on the crystal lattice of the solvent. Both Q and D o are constants that will depend on the system of diffusion (solute and solvent) and the path of diffusion (surface, grain boundary,
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Unformatted text preview: volume). In general: Q volume > Q grain boundary > Q surface D o volume < D o grain boundary < D o surface Usually the volume diffusion dominates, however, for fine grained materials Q grain boundary will dominate and for powders Q surface will....
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