tetragonal symmetry

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• tetragonal system — ▪ crystallography       one of the structural categories to which crystalline solids can be assigned. Crystals in this system are referred to three mutually perpendicular axes, two of which are equal in length. If the atoms or atom groups in the… …   Universalium

• The Tetragonal system — Crystallization Crys tal*li*za tion (kr[i^]s tal*l[i^]*z[=a] sh[u^]n), n. [Cf. F. cristallization.] 1. (Chem. & Min.) The act or process by which a substance in solidifying assumes the form and structure of a crystal, or becomes crystallized; the …   The Collaborative International Dictionary of English

• anatase — /an euh tays , tayz /, n. Mineral. a naturally occurring crystalline form of titanium dioxide, TiO2. Also called octahedrite. [1835 45; < F < Gk anátasis, equiv. to ana ANA + ta (var. s. of teínein to stretch) + sis SIS] * * * ▪ mineral       one …   Universalium

• stannite — /stan uyt/, n. a mineral, iron black to steel gray in color, with a metallic luster, copper iron tin sulfide, Cu2FeSnS4: an ore of tin. Also called tin pyrites. [1850 55; STANN(UM) + ITE1] * * * ▪ mineral       a sulfide mineral, chemical formula …   Universalium

• Crystal system — Diamond crystal structure consists of face centered cubic lattice. In crystallography, the terms crystal system, crystal family, and lattice system each refer to one of several classes of space groups, lattices, point groups, or crystals.… …   Wikipedia

• Crystal structure — In mineralogy and crystallography, crystal structure is a unique arrangement of atoms or molecules in a crystalline liquid or solid. A crystal structure is composed of a pattern, a set of atoms arranged in a particular way, and a lattice… …   Wikipedia

• Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ …   Wikipedia

• Crystal structure of boron-rich metal borides — Two single crystals of YB66 (1 cm diameter) grown by floating zone technique using (100) oriented seeds. In the top crystal, the seed (left from the black line) has same diameter as the crystal. In the bottom crystal (sliced), the seed is much… …   Wikipedia

• Forme cristalline — Cristal de pyrite présentant une forme cristalline pentagonododecaèdrique. Une forme cristalline est un ensemble de faces d un cristal qui sont dans un rapport de symétrie, c est à dire qui sont équivalentes entre elles par l application d… …   Wikipédia en Français

• High-temperature superconductivity — Unsolved problems in physics What causes superconductivity at temperatures above 50 kelvin? High temperature superconductors (abbreviated high Tc or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K… …   Wikipedia

• Magnetocrystalline anisotropy — is the dependence of the internal energy of a ferromagnet on the direction of its magnetization. As a result, certain crystallographic directions are preferred directions, or easy axes, for the magnetization. It is a special case of magnetic… …   Wikipedia