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In
the Body Centered Cubic (BCC) unit cell there is one host atom (lattice
point) at each corner of the cube and one host atom in the center of the
cube: Z = 2. Each corner atom touches the central atom along the
body diagonal of the cube, and it is easy to show by that the unit cell
edge, an irrational number, is about 2.3r. Thus, the corner atoms do not
touch one another.
The packing efficiency in this lattice can be shown to be about 68%, much
higher than the packing efficiency in a simple cubic lattice.
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