Question

Name the crystal defect which lowers the density in an ionic crystal.

Answer 1

Schottky defect reduces the density of an ionic crystal

Answer 2

Point defect is the crystal defect which lowers the density in an ionic crystal.

A Schottky is a point defect in crystal lattice. While in non-ionic compounds it is known as lattice valency defect. Point defect arises when oppositely charged ions leaves their active sites, creating vacancies hence reducing the density