Microscopic models of quasicrystals
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Comparison of HREM images and contrast simulations for dodecagonal Ni-Cr quasicrystals
2014 Since high-resolution electron micrographs of dodecagonal Ni-Cr quasicrystals are similar in contrast to those of several closely related periodic phases, it has been argued that dodecagonal quasicrystals can be described as a decoration of a dodecagonal quasiperiodic tiling with the same structural units as occur in these periodic phases. In order to corroborate this hypothesis, electron ...
متن کاملRhombellanic Crystals and Quasicrystals
Design of some crystal and quasicrystal networks, based on rhombellane tiling,is presented. [1,1,1]Propellane,is a synthesized organic molecule; its hydrogenated form, the bicyclo[1.1.1]pentane,may be represented by the complete bipartite graph K2,3 which is the smallest rhombellane. Topology of translational and radial structures involving rhombellanes is described in terms of vertex symbol, c...
متن کاملPhonons in models for icosahedral quasicrystals : low frequency behaviour and inelastic scattering properties
A detailed study of the low frequency behaviour of the phonon spectrum for 3dimensional tiling models of icosahedral quasicrystals is presented, in commensurate approxima-
متن کاملAtomic Dynamics in Decagonal Al-Ni-Co Quasicrystals
The atomic dynamics of decagonal Al-Ni-Co quasicrystals is investigated by molecular dynamics simulations. The model structures used consist of an alternating stacking of two layers, which are decorations of a hexagon-boat-star tiling. Apart from small relaxations, these model structures are essentially stable up to the melting point. Above two thirds of the melting temperature, a large fractio...
متن کاملThermodynamically Stable One-Component Metallic Quasicrystals
Classical density-functional theory is employed to study finite-temperature trends in the relative stabilities of one-component quasicrystals interacting via effective metallic pair potentials derived from pseudopotential theory. Comparing the free energies of several periodic crystals and rational approximant models of quasicrystals over a range of pseudopotential parameters, thermodynamically...
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تاریخ انتشار 2013