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EEJ MAIN Chemistry QUESTION #7139
Question 1
Which of the following crystal defects occurs when an ion is displaced from its regular lattice site to an interstitial position?
  • Schottky defect
  • Frenkel defect✔️
  • Metal deficiency defect
  • Vacancy defect
Correct Answer Explanation
The Frenkel defect is a dislocation defect where an ion (usually the smaller cation) leaves its original lattice site and occupies an interstitial space. This creates a vacancy at the original site but does not change the overall density of the crystal.