Lattice spacingh2 + k2 +12For cubic systemQhkl(c)(a）
2 2 2 2 2 1 a h k l dhkl For cubic system Lattice spacing
Thenumberof moleculesina unit cell,zIn the case of cubic crystal we can use the equatior222(h? + k? + 1?)0sinhkl4aAnd from a we can calculate the volume of a unit cell, Vif the density, p, of the crystals are known, the mass of theunit cell, M, can also be calculated:MP=VFrom a knowledge of the molecular mass, the number ofmolecules in the unit cell can be calculated
The number of molecules in a unit cell, z In the case of cubic crystal we can use the equation ( ) 4 sin 2 2 2 2 2 2 h k l a hkl And from a we can calculate the volume of a unit cell, V. if the density, ρ, of the crystals are known, the mass of the unit cell, M, can also be calculated: V M From a knowledge of the molecular mass, the number of molecules in the unit cell can be calculated