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{{Electronic structure methods}}
The '''empty lattice approximation''' is a theoretical [[electronic band structure]] model in which the ''potential'' is defined not more precisely than ''periodic'' and ''weak''. It can be noted that if an empty irregular lattice occurs the potential may not be periodic. The empty lattice approximation describes a number of properties of energy dispersion relations of non-interacting [[Free electron model|free electrons]] that move through a [[crystal structure|crystal lattice]]. The energy of the electrons in the "empty lattice" is the same as the energy of free electrons. The model is useful because it clearly illustrates a number of the sometimes very complex features of energy dispersion relations in solids which are fundamental to all electronic band structures.
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