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

written 6.5 years ago by teamques10 ★ 69k

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engineering physics

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written 6.5 years ago by teamques10 ★ 69k

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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