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Polarisability and Fajan's Rule

In normal spi...

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In normal spinel structure there is a closed packed array of O2- ions. The trivalent cations are present in 1) 50% of octahedra Voids 2)75% of octahedral Voids 3)12.5% of tetrahedral Voids 4) 25% of octahedral Voids And What is spinel Structure??

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Q. In a closed packed structure of mixed oxides, the oxide ions are arranged in hcp array. One eight of tetrahedral voids are occupied by divalent cations (A) while one-half of octahedral voids are occupied by trivalent cations (B). What is the formula of the compound?

Q. In a closed packed structure of mixed oxides, the lattice is composed of mixed oxides ions. One-eighth of tetrahedral voids are occupied by divalent cations

(A^{2 +})

while one half of octahedral voids are occupied by trivalent cations

(B^{3 +})

. The formula of mixed oxide is :

Q. In a close-packed structure of mixed oxides, the lattice is composed of oxide ions, one-eighth of tetrahedral voids are occupied by divalent cations

A

while one-half of octahedral voids are occupied by trivalent cations

B

. The formula of the oxide is:

Q. In a compound

X Y_{2} O_{4}

oxide ions are arranged in ccp structure. Cation X are present in octahedral voids and cation Y are equally distributed between octahedral and tetrahedral voids. The fraction of the octahedral voids occupied is:

O^{2 -}

ions are arranged in ccp in a spinel structure.

A^{2 +}

ions occupy one-eighth of tetrahedral voids and

B^{+}

ions occupy half of octahedral voids. The void volume of unit cell is

0.11

. Find the value of positive ions

A

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Polarisability and Fajan's Rule

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