Discussion
Frenkel defect is a defect in solid where :
Answer: D
A Frenkel defect is where a smaller ion is displaced from its lattice site to an interstitial site, creating a vacancy and an interstitial.
The ion (usually the smaller cation, as in AgCl or ZnS) leaves its normal position and squeezes into an interstitial position nearby. The crystal therefore gains a vacancy-interstitial pair, while its composition and density are unchanged and it remains electrically neutral.
When a pair of oppositely charged ions leaves the lattice altogether, creating two vacancies, the defect is a Schottky defect, which lowers the density. Dislocations are line defects, and disclinations are rotational line defects; neither is a point defect like the Frenkel pair.
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