Silver bromide crystal has

AgBr shows both Frenkel and Schottky defects because the radius ratio for AgBr is intermediate.

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.