A compound is formed by \(A\) (cations), \(B\) (cations) and \(O\) (anions). Atoms of \(O\) form a ccp lattice. Atoms of \(A\) occupy \(50\%\) of octahedral voids and atoms of \(B\) occupy \(25\%\) of tetrahedral voids. What is the molecular formula of the compound?
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For a ccp (fcc) lattice containing \(N\) particles:
\[
\text{Octahedral voids}=N
\]
\[
\text{Tetrahedral voids}=2N
\]
Always calculate the number of ions occupying the voids and then reduce the ratio to obtain the empirical formula.