Ewald and Reciprocal Lattice
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3.4 Ewald and Reciprocal Lattice
nIn 1921, Ewald developed a method of calculating the sums ofdiffraction intensities from different planes in the lattice by considering what is called the “Reciprocal Lattice”.
nThe reciprocal lattice is obtained by drawing perpendiculars to each plane in the lattice, so that the axes of the reciprocal lattice are perpendicular to those of the crystal lattice.




Importance of reciprocal lattice
nThe reciprocal lattice is useful in defining some of the electronic properties of solids.
nIt turns out that reciprocal lattice is also the site of the Brillouin zones, i.e.-the allowed electron energy bands in the solid.

