منابع مشابه
Crystallography of Dodecagonal Quasicrystals
A detailed model structure of dodecagonal quasicrystals is proposed which applies to both dodecagonal Ni-Cr and V-Ni or V-Si-Ni. This model structure can be represented as the restriction of a 5d periodic structure to a 3d subspace, which is identified with physical space. The point group and the space group of the 5d periodic structure are determined. The latter is non-symmorphic, containing a...
متن کاملCrystallography of quasicrystals ; application to icosahedral symmetry
2014 Crystallographic concepts are extended to quasicrystalline structures and applied to icosahedral quasicrystals. 2-dimensional N fold rotational symmetries are shown to be compatible with Bravais lattices in (at least) ~ (N) dimensions, where ~ (N) is the Euler number, while for 3-dimensional icosahedral symmetry the minimal dimension is 6. The case of icosahedral crystallography is worked ...
متن کاملQuasicrystals
The discretely diffracting aperiodic crystals termed quasicrystals, discovered at NBS in the early 1980s, have led to much interdisciplinary activity involving mainly materials science, physics, mathematics, and crystallography. It led to a new understanding of how atoms can arrange themselves, the role of periodicity in nature, and has created a new branch of crystallography.
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 کاملQuasicrystals pdf
In contrast to periodic crystals, quasicrystals exhibit a long range order in spite. The diffraction pattern of quasicrystals shows a dense set of Bragg peaks with.It is argued that the prevailing definition of quasicrystals, requiring them to. Restrict the definition of quasicrystals by requiring that they possess an axis.Abstract. It is argued that the definition of quasicrystals should not i...
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ژورنال
عنوان ژورنال: Bulletin of the Japan Institute of Metals
سال: 1990
ISSN: 0021-4426,1884-5835
DOI: 10.2320/materia1962.29.816