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Chemical Properties of Noble Gases

Why the ccp l...

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Why the ccp lattice has 4 oxide ions per unit cell

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Q. Barium titanate has the perovskite structure, i.e., a cubic lattice with

B a^{2 +}

ions at the corners of the unit cell, oxide ions at the face centres and titanium ions at the body centre. The molecular formula of barium titanate is:

B a T i O_{3}

crystallizes in the perovskite structure. This structure may be described as a cubic lattice, with barium ions occupying the corners of the unit cell, oxide ions occupying the face centers and titanium ions occupying the centers of the unit cells.
(a) If titanium is described as occupying holes in the

B a O

lattice, what type of hole does it occupy?
(b) What fraction of the holes of this type does it occupy?
(c) Can you suggest a reason why it has certain holes of this type but not the other of the same type?

Q. In the spinel structure, oxide ions form CCP whereas

{\frac{1}{8}}^{t h}

of the tetrahedral voids are occupied by

A^{2 +}

\frac{1}{2}

of the octahedral voids by

B^{3 +}

cations. If the oxide ions are replaced by

X^{\frac{- 8}{3}}

ions, the number of atomic vacancies per unit cell is :

Q. A solid made up of ions of A and B possessing edge length of unit cell

0.564

nm has four formula units. Among the two ions, the smaller one occupies the interstitial void and the larger ion occupies the space lattice with ccp type of arrangement. One molecule of solid has mass

9.712 \times 10^{- 23}

g. Which defect is solid AB supposed to show?

Q. KF has ccp structure. How many

F^{-}

ions and octahedral voids are there in this unit cell respectively?

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