Which of the following point defects are shown by AgBr (s) crystals ?
(a) Schottky defect
(b) Frenkel defect
( c) metal ecxess defect
(d) Metal deficiency defect

Options

A. Schottky defect
B. Frenkel defect
C. Metal excess defect
D. metal deficiency defect

Answer

A

Explanation

AgBr shows both Schottky as well as Frenkel defect. In AgBr, both `Ag^(+)` and `Br^(-)` ions are absent from the lattice causing Schottky defect. However `Ag^(+)` ions are mobile so they have a tendency to move aside the lattice and trapped in interstitial site hence, cause F frendkel defect.