Question

The size of an octahedral void formed in a closed packed lattice as compared to tetrahedral void is:

• A. equal
• B. smaller
• C. larger
• D. not definite

Answer 1

The correct option is C larger

The size of an octahedral void formed in a closed packed lattice as compared to tetrahedral void is larger.

This is apparent from the radius ratio. It is the ratio of the radius (r) of the atom or ion which can exactly fit in the octahedral void formed by spheres of radius R.

For tetrahedral voids, the radius ratio is $0.225$

For octahedral voids, the radius ratio is $0.414$

Hence, the correct option is $\text{C}$