Question

What type of crystal defect is indicated in the diagram
below?
Na⁺ Cl^– Na⁺ Cl^– Na⁺ Cl^– 

(a) Frenkel defect
(b) Schottky defect
(c) interstitial defect
(d) Frenkel and Schottky defects.

Answer 1

(b) : When an atom or ion is missing from its normal lattice site, a lattice vacancy is created. This defect is known as Schottky defect. Here equal number of Na⁺ and Cl^– ions are missing from their regular lattice position in the crystal. So it is Schottky defect.