Question

Salt Ab has a zinc blende structure. The radius of $A^{2+}$ and $B^{2-}$ ions are $0.7\mathring{A}$ and $1.8\mathring{A}$ respectively. The edge length of AB unit cell is:

• A. $2.5\mathring{A}$
• B. $\mathrm{5.0.9}\mathring{A}$
• C. $5\mathring{A}$
• D. $5.77\mathring{A}$

Answer 1

The correct option is D $5.77\mathring{A}$

In ZnS like structure

$r_A^{+}+r_B^{-}=\frac{a\sqrt{3}}{4}$

$a=5.77A^0$