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Saturday, 26 March 2016

HEXAGONAL CLOSED PACK STRUCTURE

          Here 12-atoms at each corner and 2-atoms at face centre 3-atoms in middle of crystal. Each atom at corner shared by 6 adjacent unit cells, 2 face centered are shared by another 2 unit cells and 3 atoms in centre so hence,

The Number of atoms per unit cell =2 each face x 1/2 +12 corners x 1/6 + 3 = 6 atoms

EX: Cd, Mg, Ti, Zn 


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