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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