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  4. A type of defect observed in stoichiometric compounds is Schottky defect. Schottky defect occur mainly in ionic compounds where

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Q. A type of defect observed in stoichiometric compounds is Schottky defect. Schottky defect occur mainly in ionic compounds where

J & K CETJ & K CET 2017The Solid State

Solution:

The absence of equal number of cations and anions from the lattice sites results in Schottky defect This defect is observed in ionic compounds in which negative and positive ions are of same sizes
e.g., $NaCl, KCl$ etc