In the spinel structure, oxide ions form CCP whereas 18th of the tetra – InterviewSolution

1.	In the spinel structure, oxide ions form CCP whereas 18th of the tetrahedral voids are occupied by A2+ cations and 12 of the octahedral voids by B3+ cations. If the oxide ions are replaced by X−83 ions, the number of atomic vacancies per unit cell is :
Answer» In the spinel structure, oxide ions form CCP whereas ${\frac{1}{8}}^{t h}$ of the tetrahedral voids are occupied by $A^{2 +}$ cations and $\frac{1}{2}$ of the octahedral voids by $B^{3 +}$ cations. If the oxide ions are replaced by $X^{\frac{- 8}{3}}$ ions, the number of atomic vacancies per unit cell is :

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