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Abstract
We extend the previously proposed variational cellular method to three-dimensional periodic structures with an arbitrary number of atoms per unit cell. The method is used to determine the energy bands of diamond and silicon. The calculations were carried out within the framework of the spherical-cellular-potential approximation with the unit cell partitioned into four space-filling polyhedra. The results obtained are in fairly good agreement with orthogonalized-plane-wave calculations and with observed photoemission and optical data.
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