Explain the following term with a suitable example:
$(ii)$ Frenkel defect

(N/A) $(ii)$ Frenkel defect: Ionic solids containing large differences in the sizes of ions show this type of defect.
When the smaller ion (usually cation) is dislocated from its normal lattice site to an interstitial site,a Frenkel defect is created.
It creates a vacancy defect at its original site as well as an interstitial defect at the new site.
Frenkel defect is also known as dislocation defect.
Ionic solids such as $AgCl$,$AgBr$,$AgI$,and $ZnS$ show this type of defect.