Question

Which among the following statements is true about Schottky defect ?

• A. In this defect cation and anion are lacking in stoichiometric proportion
• B. Formation of metal alloy is example of this defect
• C. In this cation or anion moves from regular site to place between lattice site
• D. In this regular cation is replaced by different cation

Answer 1

Answer: (A)

In Schottky defect, cation and anion are lacking in stoichiometric proportion. It is basically a vacancy defect in ionic solids. In order to maintain electrical neutrality, the number of missing cations and anions are equal. This defect can easily be illustrated by the following figure.