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In AO2  the  metal ions form of face centred cubic lattice the oxide ions occupy the tetrahedral sites the metal ions occupying the faces and corners of the unit cells the total number of metal ions and oxide ions per unit cell is Ans = 12 ??
Asked by ntg432000 | 13 Feb, 2019, 06:33: PM
answered-by-expert Expert Answer
Here the balls coloured with red are The Metal Ions.
 
So, the number of Metal atoms per unit cell = 8 cross times 1 over 8 plus 6 cross times 1 third space equals space 4
 
Number of Oxide ions = 8 (4 in each tertahetdral site).
 
So, Total No. of ions = 12 per unit cell.
 
Eg. CaF2 , BaF2 Structures
Answered by Sumit Chakrapani | 15 Feb, 2019, 02:02: AM

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