Frenkel defects

Frenkel defects:

This defect occurs when an ion occupies an interstitial position among the lattice points. This defect takes place usually in ionic crystals in which the anion is much larger in size than the cation. AgBr is an illustration for this type of defect. One of the Ag+ ion takes up a position in the interstitial space instead of its own suitable site in the lattice as shown in figure below:

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                                                              Figure: Frenkel Defects in a Crystal

The crystal stays neutral as the number of positive ions is similar as the number of negative ions.

 

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