Question

what are non stoichiometric point defects explain with a diagram the formation of f centres​

Answer 1

Answer:

An F-center, Farbe center or color 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.

Explanation:

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Answer 2

The answer is as follows:

Nonstoichiometric point defects are defined as defects that come into being when there is a difference in the ratio of the atoms (number of atoms) to the ratio of the number of cations to the number of anions from their original value in their chemical formula.

• The stoichiometry of the compound is thus changed, It does not affect the crystal shape despite this change.
• In the formation of an f center, the vacancy of the anion in the crystal lattice is taken up by more than one unpaired electron.
• The electrons are present due to electrons being released from sodium atoms for the formation of NaCl on the crystal.
• The F-centre can be categorized as a crystallographic defect. It is also termed as Fabre center or color center.

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