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F centre in an ionic crystal are

  • Option 1)

    Lattice site containing electrons

  • Option 2)

    Interstitial site containing electrons

  • Option 3)

    Lattice sites that are vacant

  • Option 4)

    Interstitial sites containing electrons

 

Answers (1)

best_answer

In metal excess defect some anions are missing from their correct lattice site leaving behind their electron. And the location of electron is known as F-Centre. 

 

Metal excess defect -

In this defect some anions are missing from their crystal lattice site leaving behind their electron. and the location of electron is known as F - centre. F - centre electrons are responsible for conductivity and paramagnetic behaviour .

Crystal behaves as n - type semiconductor.

 

- wherein

on heating these crystals give characteristics colour which is due to F - centre.

ex:

NaCl - Yellow

KCl - Violet

LiCl - Pink

 

 


Option 1)

Lattice site containing electrons

This is correct

Option 2)

Interstitial site containing electrons

This is incorrect

Option 3)

Lattice sites that are vacant

This is incorrect

Option 4)

Interstitial sites containing electrons

This is incorrect

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