Question

Expression for concentration of frenkel defects in physics

Answer 1

A Frenkel defect is a type of defect in crystalline solids wherein an atom is displaced from its lattice position to an interstitial site, creating a vacancy at the original site and an interstitial defect at the new location within the same element without any changes in chemical properties.[1]. This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site. It creates a vacancy defect, at its original site and an interstitial defect at its new location. Frenkel defect is also called dislocation defect. It does not change density of the solid. Frenkel defect is shown by ionic substances in which there is large difference in size of ions, for example, ZnS, AgCl, AgBr and AgI due to small size of zinc ion with charge +2 and silver ions with charges +1.