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F-center

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F (fromGermanFarbe, fromFarbzentrum) +center.

F-center (pluralF-centers)

1. (crystallography) A type ofpoint defect incrystals where ananion (negativeion)vacancy in thelattice traps one or moreelectrons, creating a localized site that absorbs specific wavelengths of light, thereby coloring the typically transparent material (e.g. theyellowing ofNaCl due to trapped electrons in missingchloride sites);defects that form due toirradiation (e.g.X-rays), heat, oralkali metal vapor treatment and can be removed by annealing.

   Hyponym:point defect

   Synonyms:Farbe center,color center.

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