CBSE Class 12-science Answered
AgBr shows both Frenkel and Schottky defects because the radius ratio for AgBr is intermediate.
Ions have Schottky defects when their anions and cations are both absent from the crystal lattice.
In AgBr, the Ag+ ions and corresponding Br̶̶‒ ions are absent from the crystal lattice causing Schottky defects.
However, Ag+ ions are exceptionally mobile and they have a tendency to move about inside the lattice. So they complement the Schottky defects with Frenkel defects with the Ag+ ions trapped in interstitial spaces. Because of the similar size of Ag+ ions and Br‒ ions and the small size of Ag+ ions and the fact that Ag+ ions have a property to be mobile, both Schottky and Frenkel defects occur.
Concepts related to crystalline and amorphous solids ...This video deals with the concepts related to crystalline and amorphous sol...
More on crystalline and amorphous solidsThis video explains important concepts related to crystalline and amorphous...
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