Question

what is f centre in chemistry

Answer 1

An F-center, FARBE center or color center  is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more unpaired electrons.

Answer 2

a f center chemistry is a type of crystallographic defect in which an anion vacancy in a crystal is a filled by one or more electrons depending on the charge of missing ion in the crystal or mainly due to the reason that when a compound is heated to a high temperature mainly metallic oxide the ion get excited and get displaced from their respective position in their crystal structure but while doing so these ion leave behind some electrons in the vacated spaces this lead the phenomenon of colour compound this is used to identify many compound zinc oxide ( Yellow) electrons in such a vacancy tend to absorb light in the visible spectrum such that a material that is usually transparent becomes a coloured thus the origin of the name f center which organites from the German farbzentrum the translation of this term provide the synonyms of this term provide the synonyms of colour center which can also refers to such effect f center are also paramagnetic and can then be studied by electrons paramagnetic resources technique the greater the number of center the more intense in the colour of the compound