Question

If N is the number of spheres in the unit cell, then total no. of octahedral voids is the cell is

• A. $N$
• B. $2N$
• C. $\frac{N}{2}$
• D. $4N$

Answer 1

The correct option is A

$N$

Total number of octahedral voids is equal to the Z_eff of any unit cell. If N is the Z_eff, which is the number of spheres (by spheres we mean effective spheres), the number of octahedral voids is N.