Question

When an electron occupies the empty space of negatively charged ions, then the
defect in crystal is
(A)
Frenkel defect
(B)
Schottky defect
(D)
None of these
(C)
F-centre​

Answer 1

The correct answer is (C)F centre.

F -centre defect.

• It is a type of non stoichiometric defect known as a F centre or Farbe centre occurs when one or more unpaired electrons get trapped in the anionic vacancies in a crystal lattice.
• Ionic crystals with F centre exhibit paramagnetic behaviour because free, unpaired electrons in anionic vacancies undergo spin in a certain direction that generates magnetic  moment.
• F centre defect are found in alkyl halides for example; Pottasium chloride(KCl) and sodium chloride(NaCl).

Non stochiometric defect

The sort of point defect known as a non-stoichiometric defect occurs when anion and cation proportions are not equal, and there are also a lot of positive and negative charges present.

To learn more about F centre, refer these links.

https://brainly.in/question/3702335

https://brainly.in/question/34506413

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