![]() Solid State Chemistry: An Introduction (3rd ed.). Washington, DC: American Chemical Society. Teaching General Chemistry: A Materials Science Companion (3rd ed.). For one-component crystals (those that contain only one type of particle), the packing fraction is represented mathematically by APF=NparticleVparticleVunitcell See also References The radius of the spheres is taken to be the maximum value such that the atoms do not overlap. In atomic systems, by convention, the APF is determined by assuming that atoms are rigid spheres. It is a dimensionless quantity and always less than unity. In crystallography, atomic packing factor (APF), packing efficiency or packing fraction is the fraction of volume in a crystal structure that is occupied by constituent particles. What is the atomic packing factor of hcp?74. FCC has a packing factor of 0.74 and BCC is 0.68 so FCC has higher packing efficiency. ![]()
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