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HELP, In solid state physics !! can some explain why this pic In 2D, this IS a unit cell but in 3D, it is NOT?
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- ?Lv 75 years agoFavorite Answer
The pattern is clearly 2 dimensional. It exists only in one plane. Suppose it exists in the xy plane - it does not extend in the z direction.
To be 3D, the pattern must extend in all 3 dimensions of space, i.e. it must exist in the x, y and z directions like this:
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