Question

Schottky defect defines imperfection in the lattice structure of a
A) Solid
B) Liquid
C) Gas
D) Plasma

Answer 1

Hint: Schottky defect, Frankel defect are the defects that arise due to removal of cation and anion and removal of cation from the crystals which causes vacant sites. Thus these defects are crystal defects.

Complete Step by Step Answer:
A solid always forms a crystal structure. A gas, a liquid or plasma can’t form crystal structure. As the schottky defect is a crystal defect thus it arises in solid.

Additional Information: In Schottky defect the equal number of anions and cations are removed from the crystal lattice to produce vacancy in the crystal which in turns causes defect in the crystal. In this defect at first one cation is removed from the crystal solid. Now to maintain the neutrality of the crystal lattice an anion is also removed from the crystal lattice. The major characteristic of Schottky defect are:
- In this defect there is a very small difference in size between cation and anion.
- In this defect both the Cation and anion leave the solid crystal.
- Atoms or the ions move out of the crystal permanently in this defect.
- Here generally two vacancies are formed, one for cation and another one for the anion.
- The density of the solid decreases.
Thus the correct option is C.

Note: Schottky defect is temperature dependent. It is directly proportional with temperature. If the temperature of the crystal solid increases the schottky defect increases.