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Types of Unit Cell

The spinel st...

Question

The spinel structure $(A B_{2} O_{4})$ consists of an fcc array of $O^{2 -}$ ions in which the

A

cation occupies one-eighth of the tetrahedral holes and the

B

cations occupy half of the octahedral holes

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A

cation occupies one-fourth of the tetrahedral holes and the

B

cations occupy half of the octahedral holes

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A

cation occupies one-eighth of the octahedral holes and the

B

cations occupy one-fourth of the tetrahedral holes

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A

cation occupies one-fourth of the octahedral holes and the

B

cations occupy one fourth of the tetrahedral holes

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Solution

The correct option is A $A$ cation occupies one-eighth of the tetrahedral holes and the $B$ cations occupy half of the octahedral holes
In case of spinel, $O^{2 -}$ ions occupy the FCC array, $A^{2 +}$ occupies one-eighth of tetrahedral voids and the $B^{3 +}$ cations occupy the half of the octahedral voids.

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Similar questions

A B_{2} O_{4}

O^{2 -}

\frac{1}{8}

A^{2 +}

\frac{1}{2}

B^{3 +}

A B_{2} O_{4}

O^{2 -}

A^{2 +}

B^{3 +}

Z n^{2 +}

A l^{3 +}

O^{2 -}

Z n^{2 +}

O^{2 -}

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