1.20 What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
1.20 What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
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1 Answer
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1.20 ZnS shows Frenkel Defect.
AgBr shows Frenkel Defect and Schottky Defect. Frenkel Defect: It is a kind of defect in crystalline solids in which atoms are displaced from their lattice position
to interstitial site creating vacancy at the lattice point. It usually occurs in ionic solid with large difference in size
of ions.
Schottky Defect: This defect occurs when oppositely charged ions leave their lattice site creating vacancies in
such a way that electrical neutrality of crystal is maintained. It is generally seen in highly ionic compounds where
difference in size of cation and anion is small.
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