Schottky Defect Vs Frenkel Defect

Schottky Defect	Frenkel Defect
It is produced because of missing atoms or ions from their normal crystal sites.	It is produced when some atoms or ions are displaced from their normal sites and occupy interstitial sites.
The presence of Schottky defect lowers the density of the crystal.	It does not affect the density of the crystal.
It is generally shown by ionic solids having high co-ordination number and in which cations and anions are of equal sizes e.g., NaCl, CsCl.	It is generally exhibited by ionic solids having low co-ordination number and in which anions are larger in size than cations e.g., AgCl, ZnS.