What is the difference between Schottky defects and Frenkel defects?

Schottky defects

Frenkel defects

1. It arises due to vacancy at a cation site and at a nearby anion site in an ionic solid.

2. Overall density of the crystal decreases.

3. It arises in ionic solids having high co-ordination number.

4.Example: NaCl, KCl, CsCl etc.

1. It arises when a cation leaves its lattice site and enters in an interstitial site in an ionic solid.

2. There is no change in the overall density.

3. It arieses in ionic solids having large anions and small cations.

Example: ZnS, AgCl, AgI etc

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The Solid State