Name the parameters that characterize a unit cell.

The six parameters that characterise a unit cell are as follows. 

(i) Its dimensions along the three edges, a, b, and c These edges may or may not be equal.

 (ii) Angles between the edges These are the angle α (between edges b and c), β (between edges a and c), and γ (between edges a and b). 

A unit cell is characterized by following six parameters: 

(i) The dimensions of the unit cell along the three edges. These are represented by a, b and c. The edges may or may not be mutually perpendicular. 

(ii) The angles between the edges. These are represented by α, β and γ. The angle α is. between b and c, β is between a and c and γ is between a and b.