Useful Quasicrystals by Jean-Marie DuBois PDF

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8 and suppose it is drawn with its five vertices around a vertex (A) on a two-dimensional lattice. The distance from the central node to the vertices is taken as the shortest distance between neighbouring lattice sites, for instance the minimum interspacing distance between atoms. If A and B are two lattice sites, then B is, as well as A, a central node for another pentagon. Therefore, D is also a lattice node. The distance C-D between two neighbouring lattice sites is smaller than A-B. Thus, A-B that we considered as the smallest pair distance is not such a distance.

Ishimasa et al. H. Kuo and his students in Beijing, China. Over the years, the family of quasicrystals of various compositions increased rapidly but its first members shared some serious disease. They were not stable and returned to a normal crystalline state after heating at moderate temperature. Also, the diffraction lines were after all rather broad, like the ones observed with highly faulted crystals of very small size. These data led to the idea that quasicrystals were intermediate between crystals and amorphous materials, probably a state worth of nothing, neither good enough for fundamental science (too complicated and too disordered) nor for applications (too metastable).

18. It was designed for the first time in 1912 by Max von Laue (1879-1960) who was looking for a measure of the wavelength of X-rays discovered about two decades earlier by Rontgen (1845-1923) in Wurtzburg, Germany. The distance between atoms was not exactly known by von Laue but could nevertheless be anticipated with fairly good accuracy from the crystal density, assuming atoms were arranged as in a simple Bravais lattice. e. about one or a few angstroms. This experiment was successful indeed and in the meantime proved the wave nature of X-rays.

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