Question

Voids vs Interstitial Site?

Answer 1

Since the spheres touch each other only at one point, there must be some empty space between them. This empty space (hole or void) is called a triangular site. Similarly, it is observed that when a sphere in the second layer is placed upon three other touching spheres a tetrahedral arrangement of spheres is produced.

Answer 2

Voids literally mean gaps between the constituent particles. Voids in solid states mean the vacant space between the constituent particles in a closed packed structure.Interstitial defect. Interstitials defects are a variety of crystallographic defects where atoms assume a normally unoccupied site in the crystal structure. In interstitial defects three or more atoms may share one lattice site, thereby increasing its total energy.