Why is Frenkel defect not found in pure alkali metal halides ?

why is Frenkel defects not found in pure alkali metal halides ?

why is Frenkel defects not found in pure alkali metal halides ?

Why is the Frenkel defect not found in pure alkali metal halides?

Why is Frankel defect is not found in pure alkali metal halide?

Why Frenkel defects are not found in pure alkali metal halides?

Even crystals prepared with great care contains certain irregularities called crystal defects. Why is fenkel defects not found in alkali metal halides ?

Why is Frenkel defect not found in alkali metal halides?

Why is Frenkel defect not found in alkali metal halides?

Frenkel defects are not found in alkali metal halides.