The structure of a mixed oxide is cubic close packed $(ccp)$. The cubic unit cell of the mixed oxide is composed of oxide ions. One-fourth of the tetrahedral voids are occupied by divalent metal $A$ and the octahedral voids are occupied by a monovalent metal $B$. The formula of the oxide is
- A$ABO_2$
- B$A_2BO_2$
- C$A_2B_3O_4$
- D$AB_2O_2$
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