Question

what is frenkel defect​

Answer 1

A Frenkel defect or dislocation defect is a type of defect in crystalline solids named after its discoverer Yakov Frenkel. 

Answer 2

A Frenkel defect or dislocation defect is a type of point defect in crystalline solids named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location.