On the basis of nature of ionic solids compare Frenkel defect with Schottky defect :

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Solution

Frenkel defect
Schottky defect
Cation moves to an interstitial site.
Equal number of cationic and anionic vacancies are present.
It is observed in cations and anions having different size. It is observed in cations and anions having similar size.
The density of crystal is not affected.
The density of crystal decreases.
It is observed in ZnS, AgBr, AgI, AgCl etc.
It is observed in alkali halides (NaCl, CsCl) etc.

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Frenkel defect	Schottky defect
Cation moves to an interstitial site.	Equal number of cationic and anionic vacancies are present.
It is observed in cations and anions having different size.	It is observed in cations and anions having similar size.
The density of crystal is not affected.	The density of crystal decreases.
It is observed in ZnS, AgBr, AgI, AgCl etc.	It is observed in alkali halides (NaCl, CsCl) etc.