Asked by Himanshu Tripathi | 2nd Oct, 2013, 06:15: PM

Expert Answer:

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. This is 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 in the structure.

Answered by  | 3rd Oct, 2013, 09:06: AM

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