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Frenkel defects involving anions is foun...

Frenkel defects involving anions is found in

A

`CaF_(2)`

B

`NaCl`

C

`AgBr`

D

Both (2) and (3)

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1
Atoms (or ions) which occupy the normal vacant interstitial positions in a crystal are called interstitials.The important factor for determining the formation of interstitals is the size of the atoms, since they are accommodated into the voids.
In adddition to two basic types of point defects (Schottky and interstitial), another hybrid type of defect can arise from a combination of the two, In a Frenkel defect ,an ion (usually cation) leaves its position in the lattice and occupies an interstitial void.
In`Agcl` and `AgBr`, Frenkel defect involves cations while in `CaF_(2)` Frenkel defect involves anions `(F^(-))` is smaller than `Ca^(2+)`
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