Draw the unit cell of HCP structure and work out the no. of atoms per unit cell.

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teamques10 ★ 66k

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written 6.0 years ago by

teamques10 ★ 66k

Each corner atom is shared by 6 neighbouring unit cells. Hence each corner carriers (1/6)th of an atom as shown:-

Each face centre carriers ½ atom. In the middle layer there are three atoms. Hence total number of atoms/unit cells are

$ n=2(6×1/6)+2(1/2)+3=6 $

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