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WHY AgBr SHOWS BOTH FRENKEIL & SCHOTKY DEFECTS

Schotky defects happen when two opposite charged ions are absent from their own regular crystal lattice .In AgBr ,the Ag + ions and the corresponding Br- ions  are absent from the crystal lattice which causes the Schotky defect.
Frenkel defect is due to the shifting of one ion from its normal position to interstitial position causing a vacancy in the original position.Here the Ag+ions are exceptionally mobile and they have a tendency to move about inside the crystal lattice .This favors Frenkel defect .


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