Question

In zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
For this type of structure, radius ratio, $\frac{r_{+}}{r_{-}}$ should be in the range of

• A. $0.225-0.414$
• B. $0.155-0.225$
• C. $0.414-0.732$
• D. $0.732-1$

Answer 1

Answer: (A)

$0.225-0.414$

For tetrahedral voids $0.225<\frac{r_{+}}{r_{-}}<0.414$