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Why agbr shows both frenkel & …

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Why agbr shows both frenkel & Schottky defect

Posted by Vishal Khandelwal 3 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Student Of The Year 3 years, 11 months ago

Due to precipitation of both ion. Since Ag+ ion is small in size they leave own lattice site and occupied interstitial site, so it show both defect. Or, the size of cation and anion are intermediate.

Yogita Ingle 3 years, 11 months ago

The radius ratio for AgBr is intermediate. Thus, it shows both frenkel and schottky defects.

The major defect in AgBr is the Frenkel defect. It has a rock salt structure i.e. CCP lattice of Br with atoms of Ag occupying all octahedral holes. Ag moves from octahedral to tetrahedral sites causing only cations to precipitate.

Schottky defect arise due to missing of ions from their lattice point and frenkel arise when the missing ions occupy interstitial sites.

in AgBr, Ag⁺ ion is small in size and when removed from lattice point they can occupy interstitial site and therefore show both frenkel and schottky defect. SCHOTTKY Defect in AgBr is exhibited due to precipitation of both Cations and Anions.

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