lattice constant

In crystallography, the lattice constant refers to the geometrical constants that define a crystal lattice. Specifically, it is the distance between identical points at the corners of a unit cell, or the angle between two edges of the cell. These constants, along with the relative lengths of the unit cell's edges and the angles between them, determine which of the seven crystal systems the solid belongs to. The arrangement of atoms, molecules, or ions in a crystal forms a space lattice, which can be divided into identical blocks called unit cells. The crystallographic axes, chosen as the intersecting edges of a unit cell, have lengths that are the lattice constants.1234