InterviewSolution
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InterviewSolution
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both/Vad do not shou。agAaBs showes? |
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Answer» In NaCl, the cation (Na + ) and anion (Cl− ) are of almost similar sizes. The defect shown by these cations and anions is Schottky defect. Whereas Frenkel defect is generally found in ionic crystals where anion is much larger in size then that the cation. Schottky defect arise due to missing of ions from their lattice point and Frenkel defect arise when the missing ions occupy interstitial sites. The radius of AgBr is intermediate hence it shows both Frenkel and Schottky defects.The major defect in AgBr is Frenkel defect. It has ccp lattice. Ag moves from octahedral to tetrahedral sites causing only cations to precipitate. Schottky defect in AgBr is exhibited due to precipitation of both cations and anions.In AgBr, Ag+ ion is small in size and when removed from lattice point they can occupy interstitial sites and hence show both Frenkel and Schottky defects. |
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