Answer to Question #53304 in Inorganic Chemistry for manisha

Question #53304
Why is frenkel defect not found in pure alkali metal halides?
Expert's answer
The frenkel defect is favoured by a large difference in size between the positive and negative ions. The metal cations are generally smaller than the anions which occupy the vacant lattice site or hole. In case of pure alkali halides, the frenkel defect is not common because the alkali metal cannot fit into the interstitial vacant positions due to their large sizes.

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