Explain about F-Centre in detail. (Atleast 7-8 lines)
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An F-center, FARBE center or color center (from the original German Farbzentrum; Farbe means color, and zentrum center) is a type of crystallographic defect in which an anionic vacancy in a crystal is filled 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 (yellow).
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The anionic sites occupied by the unpaired electron are called f centre or colour centre.
It was initiated by farbenzenter.
F centre imparts colour to the crystals.
NaCl- Yellow
LiCl- Pink
KCl- Violet
It was initiated by farbenzenter.
F centre imparts colour to the crystals.
NaCl- Yellow
LiCl- Pink
KCl- Violet
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