A mixed oxide is made up of $Z n^{2 +} A l^{3 +}$ and $O^{2 -}$ Oxide ions are arranged in CCP layers one eight of the tetrahedral holes are occupied by $Z n^{2 +}$ ions and half of the octahedral holes are occupied by $A l^{3 +}$ ions. Find the formula of mixed oxide.

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Solution

Effective number of oxide ions $= 4$ (CCP structure)
Effective numbers of $Z n^{+ 2} = \frac{1}{8} \times$ Tetrahedral voids $= \frac{1}{8} \times 8 = 1$
Effective numbers of $A l^{+ 3} = \frac{1}{2} \times$ Octahedral voids $= \frac{1}{2} \times 4 = 2$
Formula of oxide $= Z n A l_{2} O_{4}$

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Q. Spinel is a important class of oxides consisting of two types of metal ions with the oxide ions arranged in CCP pattern. The normal spinel has one eight of the tetrahedral holes occupied by one type of metal ion and one half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by

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In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z n^{2 +}$ ions and 50% of octahedral holes are occupied by $F e^{3 +}$ ions. The formula of the compound is ?

Q. Spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in CCP pattern. The normal spinel has 1/8 of the tetrahedral holes occupied by one type of metal ion and 1/2 of the octahedral holes occupied by another type of metal ion. Such a spine is formed by

Z n^{2 +}, A l^{3 +}

and

O^{2 -}

with

Z n^{2 +}

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Spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in ccp layers. The normal spinel has one-eighth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by

M g^{2 +}

A l^{3 +}

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The type of holes occupied by

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ions is___________.

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A mixed oxide is made up of Zn2+Al3+ and O2− Oxide ions are arranged in CCP layers one eight of the tetrahedral holes are occupied by Zn2+ ions and half of the octahedral holes are occupied by Al3+ ions. Find the formula of mixed oxide.

Effective number of oxide ions =4 (CCP structure)Effective numbers of Zn+2=18× Tetrahedral voids =18×8=1Effective numbers of Al+3=12× Octahedral voids =12×4=2Formula of oxide =ZnAl2O4

A mixed oxide is made up of $Z n^{2 +} A l^{3 +}$ and $O^{2 -}$ Oxide ions are arranged in CCP layers one eight of the tetrahedral holes are occupied by $Z n^{2 +}$ ions and half of the octahedral holes are occupied by $A l^{3 +}$ ions. Find the formula of mixed oxide.

Effective number of oxide ions $= 4$ (CCP structure)
Effective numbers of $Z n^{+ 2} = \frac{1}{8} \times$ Tetrahedral voids $= \frac{1}{8} \times 8 = 1$
Effective numbers of $A l^{+ 3} = \frac{1}{2} \times$ Octahedral voids $= \frac{1}{2} \times 4 = 2$
Formula of oxide $= Z n A l_{2} O_{4}$