Question

Cations are present in the interstitial sites in _________.

• A. Schottky defect
• B. Frenkel defect
• C. Vacancy defect
• D. Metal deficiency defect

Answer 1

The correct option is B Frenkel defect

$\text{Analyzing the Options}$

Option (A):

Frenkel defect is a defect, where a cation is missing from the normal lattice position and is occupying an interstitial site. It generally occurs in Ionic solids where the anion is larger than the cation.

Option (B)

In Schottky defects, the number of missing cations and anions are equal to maintain electrical neutrality in the crystal and thus decrease density.

Option (C)

Vacancy defect occurs when an atom is missing from one of the lattice sites.

Option (D)

Metal deficiency defects occurs when the positive ion is missing from its lattice site and the extra negative charge is balanced by some nearby metal ion acquiring two charges instead of one.