Question

What is Schottky defect? Explain with example.

Hint:

Schottky defects involve the removal of equal numbers of cations and anions, maintaining overall neutrality.

Answer 1

Step 1: Definition of Schottky Defect.
A Schottky defect occurs in ionic crystals when an equal number of cations and anions are missing from the lattice sites, creating vacancies. This type of defect maintains the electrical neutrality of the crystal but leads to a decrease in density because of the missing ions.
Step 2: Example.
In sodium chloride (NaCl), a Schottky defect occurs when one Na⁺ ion and one Cl⁻ ion are removed from their lattice sites, creating two vacancies.