Question

In $AgCl$, the $A{g}^{+}$ ions are displaced from their lattice position to an interstitial position. Such a defect is called:

• A. Schottky defect
• B. Frenkel defect
• C. Colour centre
• D. None of these

Answer 1

The correct option is B Frenkel defect

The Frenkel Defect (also known as the Frenkel pair/disorder) is a defect in the lattice crystal where an atom or ion occupies a normally vacant site other than its own. As a result the atom or ion leaves its own lattice site vacant.
Since there is big difference in the size of the anion and the cation in AgCl, Frenkel Defect is common here.