fcc (face centered cubic): The conventional unit cell consists of 4 atoms in com- parison to the primitive unit cell which consists of only 1 atom. ... Details about the unit cell: There can be two atoms of the same element but with different positions in the unit cell.

Is bcc a primitive cell?

A primitive cell of the bcc lattice is shown in Fig. 11, and the primitive translation vectors are shown in Fig. 12. cells by definition contain only one lattice point, but the conventional bcc cell contains 2 lattice points, and the conventional fcc cell contains 4 lattice points.

Which cell is primitive?

A primitive cell is a unit cell that contains exactly one lattice point. It is the smallest possible cell. If there is a lattice point at the edge of a cell and thus shared with another cell, it is only counted half. Accordingly, a point located on the corner of a cube is shared by 8 cubes and would count with 18 .