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F - centres are - (a) The electrons trapped in anionic vacancies (b) The electrons trapped in cation vaccancies (c) Non equivalent sites of stoichiometric compounds (d) All of the above.

F - centres are -

(a) The electrons trapped in anionic vacancies
(b) The electrons trapped in cation vaccancies
(c) Non equivalent sites of stoichiometric compounds
(d) All of the above.

Grade:12

1 Answers

Raheema Javed
156 Points
9 years ago
The correct answer is (a) The electrons trapped in anionic vaccancies.
An F-center, Farbe center or color center (from the original German Farbzentrum; Farbe means color, and zentrum center) is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more electrons. Electrons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored. This is used to identify many compounds, especially zinc oxide (yellow).

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