What are F-centres???
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F-center, Farbe center or color 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. Wikipedia
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is a type of crystallograpehic defact in which an ananios vacancy in a crystall lattice in occupied by one or more unparied electrons
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