Finite magnesium oxide nanotubes are investigated. Stacks of four parallelsquares, hexagons, octagons, and decagons are constructed and studied by thepseudopotential density functional theory within the local-densityapproximation. Optimized structures are slightly distorted stacks of polygons.These clusters are insulators and the band gap of 8.5 eV is constant over aninvestigated range of the diameters of stacked polygonal rings. Using theL"owdin population analysis a charge transfer towards the oxygen atoms isestimated as 1.4, which indicates that the mixed ionocovalent bonding exists ininvestigated MgO nanotubes.
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