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The Caesium Chloride Structure
CsCl structure is basically a simple cubic lattice with 2 atom basis, where one atom is attached to the lattice point and the other at ( a/2 , a/2, a/2) from it. Both caesium and chlorine have approximately the similar atomic radii. Chlorine ion occupies the SC lattice point with the Cs ion occupying the body centre of the cube since (a/2, a/2, a/2 ) shows the body centre of a cube of side a. Therefore each caesium ion has eight nearest chlorine atoms and the structure resembles that of a body centre of the atom.
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