Diffusion vs migration in solid state

Oxygenne
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I do not understand the difference between diffusion and migration is case of anion/cations.
Thank you!
 
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Migration is a special case of diffusion, that is ,migration have polarity (from side to another) just as in case of PN junction , electrons diffuse in one direction and holes in the other.

In case of anions and cations , Polarity exists , so the accompanied motion is migration from +ve to -ve and vice versa
 

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