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In antifluorite structure, the negative ions:

Option: 1

Are arranged in ccp
 


Option: 2

Occupy tetrahedral voids


Option: 3

Are arranged in hcp


Option: 4

Occupy octahedral voids


Answers (1)

best_answer

As we have learnt,

 

 

Na2O (Anti-Fluorite Structure)

  • Here negative ions (O2-) occupy CCP while cations Naoccupy all the tetrahedral voids.
  • Here co-ordination number of Na' is four while for O2- it is eight, here number of formula units per unit cell is four and the effective number of Liand O2- ions in a unit cell are 8 and 4 respectively.
    re + ra = √3a/4

-

In antifluorite crystal i.e  Na2O, the anions are arranged in cubic close packing while the cations occupy all the tetrahedral voids.
Therefore, Option(1) is correct

Posted by

seema garhwal

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