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Consider UC (unit cell) for a cubic ionic lattice containing 4 oxide ions - what is the avg oxidation state for Fe ions in this lattice?

The four oxide ions create a -8 charge that must be counteracted by the iron ions. In a FCC unit cell, there are 3 total Fe ions per UC; therefore each ion must have a +8/3rds oxidation state.

Is this correct?

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    $\begingroup$ It's mixed oxide - average ox state is 8/3, but one center has +2 and two have +3. $\endgroup$ – Mithoron Dec 9 '15 at 21:58
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    $\begingroup$ Fe oxides are, in fact, notorious (famous?) for having mixed oxidation states. $\endgroup$ – Geoff Hutchison Dec 9 '15 at 22:10

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