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  2. Quasicrystal - Wikipedia

    en.wikipedia.org/wiki/Quasicrystal

    Classical theory of crystals reduces crystals to point lattices where each point is the center of mass of one of the identical units of the crystal. The structure of crystals can be analyzed by defining an associated group. Quasicrystals, on the other hand, are composed of more than one type of unit, so, instead of lattices, quasilattices must ...

  3. Quasi-crystals (supramolecular) - Wikipedia

    en.wikipedia.org/wiki/Quasi-crystals_(supra...

    Quasi-crystals are supramolecular aggregates exhibiting both crystalline (solid) properties as well as amorphous, liquid-like properties.. Self-organized structures termed "quasi-crystals" were originally described in 1978 by the Israeli scientist Valeri A. Krongauz of the Weizmann Institute of Science, in the Nature paper, Quasi-crystals from irradiated photochromic dyes in an applied ...

  4. Quasicrystals and Geometry - Wikipedia

    en.wikipedia.org/wiki/Quasicrystals_and_Geometry

    The book is divided into two parts. The first part covers the history of crystallography, the use of X-ray diffraction to study crystal structures through the Bragg peaks formed on their diffraction patterns, and the discovery in the early 1980s of quasicrystals, materials that form Bragg peaks in patterns with five-way symmetry, impossible for a repeating crystal structure.

  5. Crystallographic point group - Wikipedia

    en.wikipedia.org/wiki/Crystallographic_point_group

    Each crystallographic point group defines the (geometric) crystal class of the crystal. The point group of a crystal determines, among other things, the directional variation of physical properties that arise from its structure, including optical properties such as birefringency , or electro-optical features such as the Pockels effect .

  6. Quasicrystals Were Once Impossible. Scientists Just Built the ...

    www.aol.com/quasicrystals-were-once-impossible...

    Quasicrystal are structures that were once thought impossible—and scientists just built the biggest one ever in the lab.

  7. List of quasiparticles - Wikipedia

    en.wikipedia.org/wiki/List_of_quasiparticles

    crystal lattice Phoniton: A theoretical quasiparticle which is a hybridization of a localized, long-living phonon and a matter excitation [15] phonon Phonon: Vibrational modes in a crystal lattice associated with atomic shifts crystal lattice Phonon polariton: A coupling between phonon and photons. optical phonon, photon Plasmariton

  8. Dihedral group - Wikipedia

    en.wikipedia.org/wiki/Dihedral_group

    In mathematics, a dihedral group is the group of symmetries of a regular polygon, [1] [2] which includes rotations and reflections. Dihedral groups are among the simplest examples of finite groups, and they play an important role in group theory, geometry, and chemistry. [3] The notation for the dihedral group differs in geometry and abstract ...

  9. Category:Quasicrystals - Wikipedia

    en.wikipedia.org/wiki/Category:Quasicrystals

    In other projects Wikidata item; Appearance. move to sidebar hide. Help Pages in category "Quasicrystals" The following 7 pages are in this category, out of 7 total. ...

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