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The appearance of colour in solid alkali metal halides is generally due to :

  • Option 1)

    Schottky defect

  • Option 2)

    Frenkel defect

  • Option 3)

    Interstitial position

  • Option 4)

    F-centres

 

Answers (1)

best_answer

As we have learned

No. of atoms(z) for face centered unit cell -

Lattice points: at corners and face centers of unit cell.

For face centered cubic (FCC), z=4.

- wherein

 

 

One to excitation of free electrons in f- centre , When light in visible spectrum is incident on the crystal , coloration is observed 


Option 1)

Schottky defect

Option 2)

Frenkel defect

Option 3)

Interstitial position

Option 4)

F-centres

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SudhirSol

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