Question

why a cubic lattice has end centred unit cell​

Answer 1

➠ AnSwer :-

• In order to have end centered closed packing structure unit cell must possess vectors a≠b≠c, which is absent in case of cubic unit cell due to this cubic unit cell cannot possess end-centred closed packing.
• The highest symmetry possible for an end centered unit cell is tetragonal.
• Also, each atom located on the centre of the unit cell is shared by two adjacent unit cells.
• Therefore only half atom belongs to a single unit cell.
• In end-centred cubic unit cell, 8 atoms are located on 8 corners of the cube and 1 atom each is present on two opposite faces of the cube.