What is the coordination number of the body-centered cubic unit cell?
The coordination number of the body-centered cubic unit cells is 8.
The coordination number 1s the number of nearest atoms surrounding the given atom. The greater the coordination number, the more closely packed will be the structure.
Coordination Number, CN of BCC cell: In the BCC cell, atoms occupying the corner lattice points do not touch each other. However, each corner atom is in contact with the atom at the body center. As there are eight unit cells around each corner of the cell, the atom located at a corner would be simultaneously touched by the eight body-centered atoms of the eight surrounding cells. Thus, the coordination number is 8