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  • I need help with The Ca2+ and F- are located in CaF2 crystal respectively at face centred cubic lattice points and in

The Ca2+ and F- are located in CaF2 crystal respectively at face centred cubic lattice points and in

  • Option 1)

    Tetrahedral voids

  • Option 2)

    Half of tetrahedral voids

  • Option 3)

    Octahedral voids

  • Option 4)

    Half of octahedral voids

 

Answers (1)

best_answer

In CaF2 crystal Ca2+ occupy all corners and face centre of the cube whereas F- occupy all tetrahedral voids.

 

 

Fluoride structure -

{Ca^{2+}} arrange in CCP

{F^{-}} found in all tetrahedral voids

Edge length = \frac{4}{\sqrt{3}} (r_{Ca^{2+}} + r_{F^{-}})

Coordination Number = 8 : 4

 

- wherein

Number of {Ca^{2+}} = 4

Number of {F^{-}} = 8

Number of CaF_{2} molecule per unit cell = 4

Ex :  SrF_{2} , BaF_{2} , MgCl_{2}

 

 


Option 1)

Tetrahedral voids

This is correct

Option 2)

Half of tetrahedral voids

This is incorrect

Option 3)

Octahedral voids

This is incorrect

Option 4)

Half of octahedral voids

This is incorrect

Posted by

prateek

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