Which of the following defects is represented in the given figure?

Impurity defect

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Frenkel defect

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Schottky defect

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Metal excess defect

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Solution

The correct option is C Schottky defect
In the given figure, 2 cations & 2 anions are absent from their lattice sites, (represented with red circles in the figure) creating vacancies.
In ionic crystals, the defect forms when oppositely charged ions leave their lattice sites, creating vacancies. These vacancies are formed in stoichiometric units, to maintain an overall neutral charge in the ionic solid.
So, the given figure represents Schottky defect.
So, option C is correct.

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