Question

what is F-centre.???????​

Answer 1

Answer:

An F-center, Farbe center or color center (from the original German Farbzentrum, where Farbe means color and zentrum means center) is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired 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....

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Answer 2

☃️ $\tt\underline\pink{ F-centre }$ :- The free electrons trapped in the anion vacancies are called F-centres.

• F-centre stands for Farfenzenter centre.
• F-centre imparts color to the crystal.