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Which of the following compound is likely to show both Frenkel and Schottky defects in its crystalline form?

1. CsCl
2. AgBr
3. ZnS
4. KBr

Correct answer: AgBr

Solution

AgBr is the classic ionic solid exhibiting both Frenkel defect (the small Ag+ ion moves to an interstitial site) and Schottky defect (cation-anion vacancy pairs). CsCl and KBr show essentially Schottky defects, and ZnS shows Frenkel defects.

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