Question

Frenkel defect is found in crystals in which the radius ratio is:

• A. low
• B. $1.3$
• C. $1.5$
• D. slightly less than unity

Answer 1

The correct option is A low

Frenkel defect is exhibited in ionic compounds in which the radius ratio is low. The cations and anions differ much in their sizes and the ions have low co-ordination numbers. However, in Schottky defect the size of cation and anion

are almost same, ex- KCl, AgBr.

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