Frenkel defect is present in which of the following?

Key Idea Frenkel defect is generally found in ionic crystals where anion is much larger in size than the cation. It is also known as dislocation defect. Frenkel defect is present in AgBr. This defect arises when the smaller ion (usually cation) is dislocated from its normal site. It creates a vacancy defect at its original site and an interstitial defect at its new location. $\text{ e.g. } \mathrm{AgBr}, \mathrm{AgCl}, \mathrm{AgI}, \mathrm{ZnS}$$\text{. }$