The correct statement regarding defects in crystalling solids.

Options

A. Frenkel defect is a dislocation defect
B. Frenkel defect is found in halides of alkaline metals
C. Schottky defects have no effect on the density of crystalline solids
D. Frenkel defects decrease the density of crystalline solids.

Answer

1

Explanation

Frankel defect is shown by ionic solid in which there is a large different in the size of ions (and hence the coordination number is low).for example `ZnS,AgCl,AgBr` and `Agl` due to small size of `Zn^(2+)` and `Ag^(+)` ions.
In defect the smaller ion (usually cation) is dislocated from its normal site to an interstitial site.This creates a vacancy defect at its origin site and are interstitial defect at its new location.Therfore Frenkel defect is also called dislocation defect. it does not change the density of the solid.