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Relation Between r and a

The number of...

Question

The number of octahedral voids in bcc lattice
(1) 0
(2) 1
(3) 2
(4) 3

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Solution

option (1)
0
octahedral voids are present in CCP and HCP crystals but not in BCC crystals.

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Q. The distance between an octahedral and tetrahedral void in bcc lattice will be
(1)sqr root 3 a
(2)sqr root 3a/2
(3)sqr root3a/3
(4)sqr root 3a/ 4

Q. In a compound, oxides ions form fcc lattice, whereas

\frac{1}{4} t h

of tetrahedral voids are occupied by cations

A^{2 +}

\frac{1}{8} t h

of octahedral voids are occupied by cations

B^{3 +}

ions. The simplest formula of the compound is

Q. Oxide ion forming a fcc lattice in which

F e^{2 +}

ions are occupying

1 / 8^{t h}

of tetrahedral void and

F e^{3 +}

ions are occupying

\frac{1}{2}

of the octahedral void. What will be the formula of the compound?

Q. Which of the following is correct for a 3-D hexagonal closed packing lattice ?
Here

Z_{e f f} = Total number of atoms in hcp lattice O_{v} = Total number of octahedral voids T_{v} = Total number of tetrahedral voids

What is the number of octahedral voids in the BCC Unit cell?

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