A very interested approach. Worth checking out as a different perspective on both dislocation defects and waves.
In crystals one of the more common defects is that of the dislocation. This is where there is an irregularity in the crystal structure such as the two demonstrated here.
An edge dislocation (also by Wikityke)
Both of these would be defined as line defects as as whole rows of atoms have been put out of place in these structures. The line of dislocation, more clearly existing and drawn in blue for the edge dislocation is where the displacement is most severe. These defects can act to either strenghen or weaken the crystal in which they exist.
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