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  • The Ca2+ and F- are located in CaF2 crystal respectively at face centred cubic lattice points and inOption: 1

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

As we have learnt,

 

CaF2 (Fluorite Structure)
  • Here Ca2+ occupies CCP and F- ions occupy all the tetrahedral voids.
  • Here coordination number of Ca2+ is 8 while for F- it is four and the effective number of Ca2+ and F- ions in a unit cell are 4 and 8 respectively, here the number of formula units per unit cell is four.
    re + ra = √3a/4

-

In  CaF_2 crystal  Ca^{2+} occupy all corners and face centre of the cube whereas F^- occupy all tetrahedral
voids.

Therefore, Option(1) is correct

Posted by

himanshu.meshram

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