Which among the following statements is true about Schottky defect?

• Correct answer
  A

  In this defect cation an anion are lacking in stoichiometric proportion
• B

  Formation of metal ally 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 replace by different cation

Solution

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.

Hence, the correct answer is option: 'A'.