Monday 22 April 2013

Distinguish between (i)Hexagonal and monoclinic unit cells (ii) Face−centred and end−centred unit cells.



Distinguish between
(i)Hexagonal and monoclinic unit cells
(ii) Face−centred and end−centred unit cells.
Solution:
(i) Hexagonal unit cell

Hexagonal unit cell 
For a hexagonal unit cell,
Monoclinic unit cell
For a monoclinic cell,
Monoclinic unit cell  





(ii) Face−centred unit cell
A face−centred unit cell has one constituent particle which is present at each corner and one at the centre of each face.
End−centred unit cell
A end−centred unit cell has one particles at each corners and one at the centre of any
two opposite faces.

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