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Cubic crystals
There are three types of cubic crystals namely simple cubic (sc), body centred cube (bcc) and face centred cube (fcc).
1) Simple cubic crystal (SCC)
This is the simplest of the three. A unit cell of SCC is shown in fig. There is one atom or molecule at each of the eight corners of the cube. Since each corner is shared by eight surrounding cubes hence one eighth of the atom at each corner is shared by one cube and as such there are eight such one eighth parts of atoms.
2) Body centred cube (BCC)
In this case one atom at each of the eight corners and one atom is present at the centre of the cube.
3) Face centred cube
There is one atom at each of the eight corners and one atom at the centre of each of six faces of the cube. Since each face is shared by two cubes hence half atom at each face belongs to one cube.
Hence we find that SCC is a primitive cell but bcc and fcc are non primitive cells.
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