#frenkel defect

A Frenkel defect ( 2 ) is point defect wherein a single atom creates both a vacancy and an interstitial by moving from a lattice site to an interstitial site within a crystal. It is a neutral defect that does not effect the number of atoms in a crystal, thereby allowing the density to remain the same as well.

Frenkel defects are most common in ionic solids that have large size differences between the anions and cations, such as AgBr or AgI.