Calculate the number of atoms in fcc unit cell.

 Calculate the number of atoms in fcc unit cell.

Number of atoms in face-centred cubic (fcc)

unit cell :

In this unit cell, there are 8 atoms at 8 corners and 6 atoms at 6 face centres. Each corner contributes 1/8th atom to the unit cell, hence due to 8 corners,

Number of atoms 

=18×8=1.

Each face centre contributes half of the atom to the unit cell, hence due to 6 face centres, Number of atoms 

=12×6=3.

∴

 Total number of atoms present in fee unit cell = 1 + 3 = 4.

Hence the volume of the unit cell is equal to the volume of four atoms.

Face centered unit cell

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