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Which defect does the following diagram represent?

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Which defect does the following diagram represent?

(a) Vacancy defect

(b) Schottky defect

(c) Frankel defect

(d) Interstitial defect

I have been asked this question in an interview for internship.

The doubt is from Crystal Defects in division Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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The correct option is (d) Interstitial defect

Explanation: Interstitial defects occur when an atom occupies an empty position in a crystal lattice. Self-interstitial effects occur due to their own atoms, while others occur due to a foreign substance.

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