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Atomic Packing Factor (crystallography )

significance of atomic packing factor. what is atomic packing factor? what is APF of simple cubic crystal? what is a unit cell? why we need atomic packing factor? how to calculate atomic packing factor. watch for detail explanation 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. It is a dimensionless quantity and always less than unity. In atomic systems, by convention, the APF is determined by assuming that atoms are rigid spheres. The radius of the spheres is taken to be the maximum value such that the atoms do not overlap. For one-component crystals (those that contain only one type of particle), the packing fraction is represented APF=Nnumber of atoms V volume of atom/Vunit cell Unit cell is building block of crystal structure, unit cell combines to form the whole crystall structure. their are many types of unit cell for example simple cubic, face centered cubic, body centered cubic, tetragonal,hexagonal,hexagonal closed packed etc Atomic packing factor of simple cubic crystal is the simplest to calculate. Hashtags #atomicpackingfactor #crystallography #unitcell #cellvloume #volumeofatom