Frenkel defect: an ion leaves its site and occupies an interstitial position

1. A.
   Schottky defect
2. B.
   Frenkel defect
3. C.
   Substitutional impurity defect
4. D.
   Interstitial impurity defect

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1. A.
   It arises due to an equal number of actions and anions are missing from their regular poisons in the crystal lattice.
2. B.
   It arises when an ion of an ionic compound is missing from its regular site and occupies an interstitial position.
3. C.
   After the defect density of substance decreases.
4. D.
   In this, electrical neutrality of the compound is not maintained.

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