Which of the following defects is also known as dislocation defect?
(i) Frenkel defect
(ii) Schottky defect
(iii) Non-stoichiometric defect
(iv) Simple interstitial defect
The answer is the option (i).
In Frenkel defect, some cations create a vacancy and occupy interstitial site. That is why it is also called dislocation defect.