Body Centred Cubic Unit Cell: The body-centered cubic (BCC) unit cell is a type of unit cell that is characterized by a simple cubic lattice with an additional atom located at the center of the cube. A body-centered cubic unit cell contains one lattice point or one atom at each of its corners, and an additional atom at the center of the cube. Therefore, the number of atoms in a body-centered cubic unit cell is equal to two
The edge length (a) of a body centred cubic unit cell can be determined using the relationship between the lattice constant (a) and the atomic radius (r) of the atoms in the crystal. In a body-centered cubic unit cell, the distance between two adjacent lattice points (or the edge length of the unit cell) is equal to 4√3 times the atomic radius. Therefore, the edge length (a) of a body-centered cubic unit cell can be expressed as:
a = 4√3∙r
The coordination number of the atoms in a body-centered cubic lattice is equal to eight, as each atom is in contact with eight neighboring atoms. The packing fraction of a body-centered cubic lattice is relatively high, at around 0.68, meaning that there is relatively little empty space in the lattice.
Some of the key properties of the body centred cubic unit cell are:
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