In normal spinel structure there is a closed packed array of O2– ions. The trivalent cations are present in:-


(1) 75% of octahedral voids
(2) 50% of octahedral voids
(3) 12.5% of tetrahedral voids
(4) 25% of octahedral void

Dear User,
In normal spinel structure, A2+ occupy 1/8th of the tetrahedral voids and B3+ occupy 1/2 i.e. 50% of the octahedral voids.
Therefore, the correct answer is (2) 50%of octahedral voids.

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