How many lattice points are there in one unit cell of each of the following lattice?
a. Face-centred cubic
b. Face-centred tetragonal
c. Body-centred

Explanation

In face centered tetragonal unit cell
Number of face centered atoms per unit cell
= 6 face centered atoms `xx (1)/(2)` atom per unit cell
`= 6 xx (1)/(2) = 3 ` atoms
`therefore` Total no. of lattice points = 1 + 3 = 4