Question

Frenkel defect is observed in:

• A. $MgC{l}_2$
• B. $AgCl$
• C. $ZnS$
• D. $AgI$

Answer 1

Answer: (B), (C), (D)

The correct options are
B $AgCl$
C $ZnS$
D $AgI$

Frenkel defect is the 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.

Frenkel defect is exhibited in ionic compounds in which the radius ratio is low. The cations and anions differ much in their sizes and the ions have low co-ordination numbers. Examples are ZnS, AgBr, AgI, AgCl.