Linked from
The 10 pages that link to Lattice parameter, each with the reason it gives.
Unit cellRelated: These six measurements distinguish unit-cell shapes and define lattice dimensions.
Rock salt structureRelated: The cubic cell’s edge length sets the scale of interionic separations.
Tetragonal crystal systemRelated: The tetragonal parameters satisfy a = b ≠ c and α = β = γ = 90°.
Triclinic crystal systemRelated: All six parameters may vary independently in a triclinic cell.
Atomic packing factorRelated: Cell dimensions connect atomic radius to the volume used in the ratio.