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Which of the following ionic solids exhibits Frenkel defect?

 

Option: 1

LiF


Option: 2

NaCl


Option: 3

CaO


Option: 4

KBr


Answers (1)

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The correct answer is option (a)  LiF . LiF also known as lithium fluoride, exhibits Frenkel defect. Frenkel defect is a type of point defect in ionic solids where a cation is displaced from its regular lattice site to an interstitial site.LiF is an ionic solid in which Li^{+} cations are small in size and can easily move to an interstitial site, leaving behind a vacancy at its original lattice site. NaCl  (sodium chloride), CaO (calcium oxide), and K\: \: Br  (potassium bromide) do not exhibit Frenkel defect as their cations are larger in size and not as easily movable. Hence, the correct answer is option (a) LiF

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