1.

Define f-centre and how it is formed in lattice of crystal

Answer»

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. ... Cl− vacancies are generated, because of the excess of NA+.



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