Question
Distinguish between:
- Hexagonal and monoclinic unit cells.
- Face-centred and end-centred unit cells.
| Hexagonal unit cell | Monoclinic unit cell |
| a=b≠c | a≠b≠c |
| α = β = 90° | α = γ = 90° |
| γ = 120° | β ≠ 90° |
| Face-centred unit cell | End-centred unit cell |
| A Face-centred unit cell the constituent particles are present at the corners and one at the centre of each face. | An End-centred unit cell contains particles at the corners and one at the centre of any two opposite faces. |
| Total no of particles in a face centered unit cell= 4 | Total no. of particles in an end centered unit cell = 2 |
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