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Information × Registration Number 0209U006416, 0105U009078 , R & D reports Title The symmetry-topological preconditions of the structure of crystalline materials of variable composition and their one-particle spectra. popup.stage_title Head Bercha Daria Mikhajlovna, Nebola Ivan Ivanovich, Registration Date 12-02-2009 Organization Uzhgorod National University popup.description2 Generalization of the elementary bands concept for the wide variety of the complex crystalline structures (high symmetry crystals, crystals with many atoms in the elementary cells, structures with transition metals atoms and spatially inhomogeneous systems) has been carried out and established it's fundamental character for prediction and obtaining of the information about the topology and possible evolution of the energy spectra and chemical bonding in dependence on composition change on the basis of general data about the crystal, solid solution and superlattice. In the framework of the superspatial symmetry concept the calculations of the phonon spectra dispersions of the crystal structures with (2ах2ах2а), (2ах2ах4с) and (4ах4ах4а) natural superlattices in the АВС and А В systems and also in quasifuleren wireframe structure and hexagonal crystals where carried out. The transformation of these spectra in dependence with the compositional and force variations has been investigated. Product Description popup.authors popup.nrat_date 2020-04-02 Close