Question

describe packaging crystal (sc.Bcc) and what is packaging efficiency
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Answer 1

Answer:

In body-centred cubic unit cell (BCC) has atoms at each corner of the cube and an atom at the centre of the structure. The packing efficiency of the BCC lattice is 68%.

The packing efficiency is the fraction of the crystal (or unit cell) actually occupied by the atoms. It must always be less than 100% because it is impossible to pack spheres (atoms are usually spherical) without having some empty space between them.