What is the difference between Schottky and Frenkel defects.
A Frenkel defect is form of interstitial defect when an atom or ion leaves its place in the lattice (leaving a vacancy), and lodges nearby in the crystal (becoming an interstitial). The number of interstitials formed will equal the number of vacancies formed and the density remains the same.
Schottky defects: is a vacancy defect , it decreases the density and equal numbers of cations and anions are missing from the lattice.