In a compound, nitrogen atoms (N) make cubic close packed lattice and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N?
Let the no. of atoms per unit cell be n. For ccp lattice the value of n is 4
Number of tetrahedral voids generated
We know that only one-third of tetrahedral voids are occupied by metal M.
Number of metal atoms
Thus formula is