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Why AgBr shows both Frenkel and Schotcky defects? |
| Ions have Schottky defects when their anions and cations are both absent from the crystal lattice. In AgBr, the Ag+ ions (and corresponding Br- ions) are absent from the crystal lattice causing Schottky defects. However, Ag+ ions are exceptionally mobile and they have a tendency to move about inside the lattice. So they complement the Schottky defects with Frenkel defects with the Ag+ ions trapped in interstitial spaces.Because of the similar size of Ag+ ions and Br- ions and the small size of Ag+ ions and the fact that Ag+ ions have a property to be mobile, both Schottky and Frenkel defects occur. |
