In the cubic close packing, the unit cell has

Question

In the cubic close packing, the unit cell has (A) 4 tetrahedral voids each of which is shared by four adjacent unit cells (B) 4 tetrahedral voids within the unit cell (C) 8 tetrahedral voids each of which is shared by four adjacent unit cells (D) 8 tetrahedral voids within the unit cells

Tardigrade Admin · Accepted Answer

Cubic close packing is also called face centred cubic. No. of atoms per unit cell in ccp (or fcc) = 4 ∴ No. of tetrahedral voids = 2 × 4 = 8

Q. In the cubic close packing, the unit cell has

$4$ tetrahedral voids each of which is shared by four adjacent unit cells

$4$ tetrahedral voids within the unit cell

$8$ tetrahedral voids each of which is shared by four adjacent unit cells

$8$ tetrahedral voids within the unit cells

Cubic close packing is also called face centred cubic.
No. of atoms per unit cell in $cc p$ (or $f cc) = 4$
$∴$ No. of tetrahedral voids $= 2 \times 4 = 8$

Q. In the cubic close packing, the unit cell has

4 tetrahedral voids each of which is shared by four adjacent unit cells

4 tetrahedral voids within the unit cell

8 tetrahedral voids each of which is shared by four adjacent unit cells

8 tetrahedral voids within the unit cells

Cubic close packing is also called face centred cubic. No. of atoms per unit cell in ccp (or fcc)=4 ∴ No. of tetrahedral voids =2×4=8

$4$ tetrahedral voids each of which is shared by four adjacent unit cells

$4$ tetrahedral voids within the unit cell

$8$ tetrahedral voids each of which is shared by four adjacent unit cells

$8$ tetrahedral voids within the unit cells

Cubic close packing is also called face centred cubic.
No. of atoms per unit cell in $cc p$ (or $f cc) = 4$
$∴$ No. of tetrahedral voids $= 2 \times 4 = 8$