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Question
Draw the unit cell of HCP structure and work out the no. of atoms per unit cell.
Solution
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(6xx1/6)+2(1/2)+3=6`
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