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Question

In a closed packed structure of mixed oxides, the oxide ions are arranged in hcp array. One eight of tetrahedral voids are occupied by divalent cations (A) while one-half of octahedral voids are occupied by trivalent cations (B). What is the formula of the compound?

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Solution

Effective no. of oxide ions, Zo2e=6
Effective number of A=18×12(Tetrahedral voids) =32
Effective number of B=12×6=3
Formula of compound =A32B3O6=AB2O4

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