Everybody is familiar with the experience that a drop of ink slowly dissolves in water or smoke spreads out in air. The reason for these phenomena is the motion of the molecules in a liquid or a gas. Although less obvious, atoms in a solid are also capable of leaving their lattice sites by thermal activation and to move through the crystal. This is referred to as solid state diffusion.
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Professor Dr. Günter Gottstein
- Springer Berlin Heidelberg
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