BE Production Engineering Semester 1 (FE First Year)University of Mumbai
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# Draw the unit cell of HCP structure and work out the no. of atoms per unit cell. - BE Production Engineering Semester 1 (FE First Year) - Applied Physics 1

ConceptStudy of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

#### 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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#### APPEARS IN

Solution Draw the unit cell of HCP structure and work out the no. of atoms per unit cell. Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;.
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