In interstitial defect, since constituent particles occupy interstitial site then why there is an increase in density?
Interstitial Defects: - Sometime in the formation of lattice structure some of the atoms occupy interstitial site, the defect arising because of this is called Interstitial Defects.
In interstitial defect, some atoms occupy sites at which; generally there is no atom in the crystal structure. Because of the interstitial defects, the number of atoms becomes larger than the number of lattice sites.
Increase in number of atoms increases the density of substance, i.e. interstitial defects increase the density of substance.
The vacancy defects and interstitial defects are found only in non-ionic compounds. Such defects found in ionic compounds are known as Frenkel Defects and Schottky Defects.