Question

Frenkel defect does not change the density of the ionic crystal whereas Schottky defect lowers the density of ionic crystal. Give a reason.

Answer 1

This is because in a Frenkel defect, no ions are missing from the crystal lattice site, whereas in the case of a Schottky defect, an equal number of positive and negative ions are missing from the crystal lattice; hence, density decreases.