Which point defect lowers the density of a crystal?

Which point defect lowers the density of crystal ?

Which point defect decreases the density of crystals ?

Which point defect does not lowers density of a crystal.

Which point defect may lower the density of an ionic crystal?

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

Schottky defect lowers the density of ionic crystals while frenkel defects does not .

Schottky defect lowers the density of the crystal but Frenkel defect does not. Discuss.

Schottky defect lowers the density of ionic crystals while Frenkel defect does not. Why?

Schottky defect lowers the density of ionic crystals while Frenkel defect does not. Discuss.