How many lattice points are there in one unit cell of each of the following lattices ? (i) face centred cubic ,(ii) face centred tetragonal ,(iii) body centred cubic.

How many lattice points are there in one unit cell of each of the foll

1.	How many lattice points are there in one unit cell of each of the following lattices ? (i) face centred cubic ,(ii) face centred tetragonal ,(iii) body centred cubic.
Answer» Solution :Lattice points in face centred cubic or face centred TETRAGONAL =8 (at corners) + 6 ( at face centres ) =14. However , PARTICLES PER unit cell =`8xx1/8+6xx1/2=4` Lattice points in body centred cube =8 (at corners ) + 1 ( at body centre) =9 However, particles per unit cell =`8xx1/8+1=2`