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Question

Fe3O4 has inverse spinel structure. What is not true about this solid?

A
Fe3+ ions are equally distributed between octahedral and tetrahedral voids
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B
Tetrahedral voids are equally distributed between Fe2+ and Fe3+
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C
Number of O2 >Fe3+ > Fe2+
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D
Coordination number of Fe3+ = 8 throughout the unit cell
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Solution

The correct option is D Coordination number of Fe3+ = 8 throughout the unit cell
Fe3O4 has inverse spinel structure.
O2 ions forms FCC unit cell.
Fe3+ occupies 18(TV)= One Fe+3
Fe2+ occupies 14(OV)= One Fe+2
Fe3+ occupies 14(OV)= One Fe+3

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