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1.12 Distinguish between

(i) Hexagonal and monoclinic unit cells

(ii) Face-centred and end-centred unit cells.

Answers (1)

D Devendra Khairwa

(i) Hexagonal and monoclinic unit cells:-

Properties	Hexagonal	Monoclinic
Possible Variation	Primitive	Primitive, End centered
Axial distance	$a=b\neq c$	$a\neq b\neq c$
Axial angles	$\alpha =\beta =90^{\circ}$ $\gamma =120^{\circ}$	$\alpha =\gamma =90^{\circ}$ $\beta \neq 90^{\circ}$
Examples	Graphite, ZnO	Monoclinic sulphur

(ii) Face-centred and end-centred unit cells:-

A face-centred unit cell contains atoms at all the corners and at the centre of all the faces, whereas in end - centred unit cell one pair of opposite faces contains atoms apart from atoms at all the corners.
The total number of atoms in a unit cell differs by 1.

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