Which point defect lowers the density of crystal ?

Which point defect does not lowers density of a crystal.

What is the effect of presence of Schottky defects on the density of the crystal?

Ionic lattic has two major points defects ,(1) Schottky (2) Frenkel defects . Schottkly defects occurs due to the cations - anion pair's missing from the lattice sites . Frenkel defects occurs when smaller ion leaves from its lattic site and fits into an intersitial space.which defect decrease density of the crystal ?

Statement : Due to Frenkel defect the density of the crystalline solid remains same. Explanation : In Frenkel defect, no cations or anions leave the lattice.

Define point defects.

Examine the given defective crystal? Answer the following questions: How is the density of the crystal affected by this defect?