The Solid State - Result Question 38
####38. Schottky defect in crystals is observed when
[1998]
(a) an ion leaves its normal site and occupies an interstitial site
(b) unequal number of cations and anions are missing from the lattice
(c) density of the crystal is increased
(d) equal number of cations and anions are missing from the lattice
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Solution:
- (d) If in an ionic crystal of the type $A^{+} . B^{-}$, equal number of cations and anions are missing from their lattice sites so that the electrical neutrality is maintained. The defect is called Schottky defect.
