A solid crystal is composed of X, Y and Z atoms. Z atoms (radius 200 pm) form cubic closed packed structure where as X (radius 50 pm) and Y (radius 100 pm) occupy respective voids. Assume all the voids are occupied.
rxrz=50200=0.25
Which is in b/w 0.225 – 0.414
∴ ‘X’ atoms are in tetrahedral voids