Question

Which type of 'defect' has the presence of cations in the interstitial sites ?
(1) Vacancy defect
(2) Frenkel defect
(3) Metal deficiency defect
(4) Schottky defect

Answer 1

Answer: (2) Frenkel defect 

In Frenkel defect, some of ion (usually cation due to their small size) missing from their correct position and occupies position in interstitial.

Frenkel defect result in arrangement of cation at interstitial site