Question

What type of crystal defect is indicated in the diagram given below?

• A. Both Frenkel and Schottky defects
• B. Schottky defect
• C. Interstitial defect
• D. Frenkel defect

Answer 1

The correct option is B Schottky defect

The schottky defect is a defect which is produced when one cation and anion are missing from their respective positions leaving behind a pair of holes. The crystal as a whole remains neutral because the number of missing positive ions (cations) and negative ions (anions) is the same.
Frenkel defect is a defect which is created when an ion leaves its appropriate site in the lattice and occupies an interstitial site. A hole or vacancy is thus produced in the lattice.