Everything about F-center totally explained
An
F-Center is a type of
crystallographic defect in which an
anionic vacancy in a
crystal is filled by one or more
electrons, depending on the charge of the missing
ion in the crystal. Electrons in such a vacancy tend to light in the visible spectrum, such that a material that's usually
transparent becomes colored. Thus the origin of the name, F-center, which originates from the German
Farbzentrum. The translation of this term also provides the synonym
color center, which can also refer to such defects.F-centers are often paramagnetic and can then be studied by
electron paramagnetic resonance techniques. The greater the number of F-centers, the more intense is the color of the compound. F-centers can be created say by passing sodium vapours over NaCl, when Cl
- ions combine with the metal ions producing non-stoichiometric defects within the lattice. The electrons released in this process diffuse to occupy the vacant places. Also
ionizing radiation can produce F-centers.
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