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Which kind of crystal defect involves cations occupying interstitial positions?

1. Schottky defect
2. Vacancy defect
3. Frenkel defect
4. Metal deficiency defect

Correct answer: Frenkel defect

Solution

The Frenkel defect occurs when cations are displaced from their normal lattice positions to interstitial sites, creating a vacancy where the cation was originally located. This type of defect is characterized by the presence of both a vacancy and an interstitial ion.

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