Question

In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is known as____________.

• A. Interstitial defect
• B. Valency defect
• C. Frenkel defect
• D. Schottky defect

Answer 1

Answer: (C)

Frenkel defect

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.
The electroneutrality of the crystal is maintained since the number of positive and negative ions is the same. Since positive ions are small in size, they usually leave their positions in the lattice and occupy interstitial positions.