quasicrystal


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qua·si·crys·tal

 (kwā′zī-krĭs′təl, kwä′zē-)
n.
A structural form of matter that is less orderly than a crystal and more orderly than a glass.

qua′si·crys′tal·line adj.

qua•si•crys•tal

(ˌkweɪ zaɪˈcrys tl, ˌkweɪ saɪ-, ˌkwɑ si-, -zi-)
n.
a form of solid matter whose atoms are arranged like those of a crystal but assume patterns that do not exactly repeat themselves.
[1985–90]
References in periodicals archive ?
The rock has been designated as a (https://www.ancient-origins.net/news-science-space/meteorite-found-siberia-contains-naturally-impossible-crystal-00495) quasicrystal because of its unique structural properties.
At the high-temperature limit of 858[degrees]C, the diffusivity does not prevent the supply of Al and O, thus, the surface film establishes a stoichiometric condition, which favors crystallization, correspondingly, and the oxidation of the clean pentagonal surface of [Al.sub.63][Cu.sub.25][Fe.sub.12] quasicrystal leads to the growth of an amorphous oxide layer, very fine film type.
A one-dimensional hexagonal piezoelectric quasicrystal medium of a point group 6 mm which is initially in a reference undisturbed stress-free state is studied here.
Analysis of an endlessly single-mode penrose-tiling photonic quasicrystal fiber.
For example, atomic crystals can have various irregularities, such as defects and edge dislocations, and also quasicrystal structures, which have long-range orientational order but no translational symmetry [12,13].
The quasicrystal analyzed in [17] has decagonal symmetry and in this case [R] should have the form [18, 26-28],
The comparison between subliminally perceived quantal maps and previous cortical maps stored in synaptic networks occurs by quantal non-local quasicrystal tiling effect which mediates the activation and deactivation of synapses through contraction and growth of dendritic spines.
1-CS-coke sample; 2-Nc-the average lattice number in a quasicrystal [d.sub.(002)] CS (1) [nm] Lc [nm] La [nm] Nc (2) G MC1 0.43 1.4 1.3 3.5 79 MC2 0.40 1.5 1.2 3.7 81 MC3 0.39 1.7 1.2 4.4 91 MC4 0.41 1.6 1.0 3.9 86 Tab.
The fifteenth century is not scientifically hollow either: for example, one finds a host of intricate design patterns in Islamic architecture of the period that exhibit surprisingly advanced decagonal quasicrystal geometry--a concept discovered by Western mathematicians and physicists only in the 1970s and 1980s.
Some of the coatings are listed as follow: hydroxyapatite coating (Lin et al, 2001; Chu et al, 2001; pfaff et al, 1993), bioceramics (Hench, 1991; Lugscheider et al, 2001), sol-gel coatings (Chai et al, 2001), quasicrystal thin films (Symko et al, 2001), functionally graded materials coatings (Khor & Wang, 2001), graded coatings (Park & Condrate, 1999), composite coatings (Wang et al, 2000; Breme et al, 2000) and biomimetic coatings (Li et al, 2001; Li et al, 2002).