How much space is filled in cubic close packing?

Answer:

Cubic close packing is highly efficient and 74% space in the crystal is filled.

Cubic closed packing (CCP)

  • The unit cell consists of four layers of atoms in a cubic close-packed arrangement of atoms.
  • The layers at the top and bottom contain six atoms at the hexagon corners and one atom at the middle of each hexagon.
  • The packing quality is the proportion of the atoms directly occupied by the crystal.
  • It must often be less than 100 percent, since spheres can not be filled without any empty space between them.

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