Calculate Crystal Structure Efficiency
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Calculate APF for common crystal structures.
Calculate APF for any unit cell configuration.
Atomic Packing Factor (APF) is the ratio of the volume occupied by atoms to the total volume of the unit cell. It measures how efficiently atoms are packed in a crystal structure.
APF = (Volume of atoms in unit cell) / (Total volume of unit cell)
Standard APF values:
APF depends on:
APF is important in:
APF = (n × Va) / Vc
where n = number of atoms, Va = atomic volume, Vc = cell volume
Va = (4/3)πr³
where r = atomic radius
Vc = a³ (cubic)
where a = cell edge length