Explain Schottky defect.

Explanation

(i) Schottky defect arises due to the missing of equal number of cations and anions from the crystal lattice.
(ii) This effect does not change the stoichiometry of the crystal.
(iii) Ionic solids in which the cation and anion are of almost of similar size show shottky defect. Ex `:` NaCl.
(iv) Presence of large number of schottky defects in a crystal, lower its density.