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  Structure Exercises     9 of 18
The reciprocal lattice of a 3-D real lattice is constructed in the same way as for 2-D lattices, with the addition of a third unit vector, c*, which is defined:

  c* points in a direction perpendicular to a and b.

Have a go imageAn orthorhombic unit cell is shown opposite in both its real and reciprocal space representations. Change the size of the real cell by dragging the white lattice points, and observe the effect on the reciprocal lattice cell.

Questions imageIn the lattice shown above, the reciprocal vectors are parallel to their corresponding real vectors. This is only true for the unit cells of certain crystal systems, which are they?



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