tetragon

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tet·ra·gon

, tetragonum (tet'ră-gon, tet'ră-gō'nŭm),
Quadrangle; a figure having four sides.
[tetra- + G. gōnia, angle]
References in periodicals archive ?
The researches on the properties of the coatings at the various levels of preliminary heating of the substrate have shown that the coating with the prevailing content of the tetragonal phase (99%--tetragonal phase, 1%--monoclinic, see Fig.
Vickers' hardness is then expressed as the ratio of the testing load applied to dint area in form of regular tetragonal pyramid with square base and the vertex angle equal to the angle of penetrating body (136[degrees]).
Fruits deflexed (-ascending or divergent), dehiscent (-indehiscent), oblong, subterete or tetragonal (-laterally compressed) in cross section, ovoid in one species, coriaceous.
The promising properties of this ceramics are attributed to the stress-induced phase transformation from tetragonal to monoclinic structures.
These enormous fluids of clay suggest a new plastic hypothesis for the tetragonal structures, solidly collocated on the ground.
CeraPure YTZP (yttria-stabilized tetragonal zirconia polycrystals) provides excellent chemical resistance in chemically corrosive environments, and its flexural strength is nearly double that of traditional ZTA, data from CoorsTek indicates.
5 H2O has a tetragonal structure with layers of NbWO6 slabs made up of Nb/W oxygen octahedra, separated by interlayer water molecules.
Skipping over the technical discussions of the isometric, tetragonal and monoclinic systems, I headed straight to the "Catalogue of American Localities of Minerals," where Dana listed many of our Bay State communities and the geologic treasures they hold.
The mechanism behind it is quite simple: atoms tend to be arranged in several crystallographical configurations having different symmetry groups: higher symmetrical one (referred to as the austenite phase, typically cubic) has higher thermal capacity while lower symmetrical one (called the martensite phase, typically tetragonal, orthorhombic, or monoclinic) has lower thermal capacity and may exist, by symmetry, in several variants (typically 3, 6, or 12, respectively).
Then, he used an approximate solution provided by tetragonal or hexagonal lattices; he calculated the movement of vertices for these lattices.
The second bead is a rare earth stabilized zirconia that is formed into Tetragonal Zirconia Polycrystals (TZP) of specific gravity 6.