F-center
Sign in to savethumb|220px|F-center in an NaCl crystal An F-center or color center or Farbe 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 in a crystal lattice tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored. The greater the number of F centers, the more intense the color of the compound. F centers are a type of color center.
Article
13 sectionsContents
- History
- Occurrences
- Types
- Single vacancy F center
- Complex F center
- F<sub>s</sub> centers
- Fabrication
- Irradiation
- Additive coloring
- Low temperature vapour deposition
- Lasers
- See also
- References
thumb|220px|F-center in an NaCl crystal An F-center or color center or Farbe 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 in a crystal lattice tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored. The greater the number of F centers, the more intense the color of the compound. F centers are a type of color center.
This is used to identify many compounds, especially zinc oxide (yellow).