Frenkel defect does not have any impact on the density of the solid as it involves only the migration of the ions within the crystal, thus preserving both the volume as well as mass.

What happens to density in Frenkel defect?

In Frenkel defect, ions get displaced from their original position and move to interstitial sites. Hence, there is no change in the density of the crystal.

Does density decreases in Frenkel defect?

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal.