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crystalline boron

См. также в других словарях:

  • Boron — (pronEng|ˈbɔərɒn) is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element on… …   Wikipedia

  • Boron trioxide — Other …   Wikipedia

  • boron — boronic /boh ron ik, baw , beuh /, adj. /bawr on, bohr /, n. Chem. a nonmetallic element occurring naturally only in combination, as in borax or boric acid, and obtained in either an amorphous or a crystalline form when reduced from its compounds …   Universalium

  • Boron nitride — IUPAC name Boron nitride Identifiers …   Wikipedia

  • boron carbide — n. a black, crystalline compound of boron and carbon, B4C, almost as hard as diamond: used as an abrasive and in control rods for nuclear reactors: see MOHS SCALE (sense 2) …   English World dictionary

  • boron — ► NOUN ▪ a non metallic chemical element which can be prepared as a brown powder or (if pure) a black crystalline semiconductor. DERIVATIVES boride noun. ORIGIN from BORAX(Cf. ↑borax) …   English terms dictionary

  • boron carbide — Chem. a black, crystalline, extremely hard, water insoluble solid, B4C, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory. * * * ▪ chemical compound       (B4C), crystalline compound of boron and carbon. It is… …   Universalium

  • boron nitride — noun : any binary compound of boron and nitrogen; especially : a fluffy white crystalline powder BN made in various ways (as by the reaction of ammonia and fused boric oxide) and used chiefly as a lubricant and electric insulator * * * Chem. a… …   Useful english dictionary

  • boron carbide — noun : any binary compound of boron and carbon; especially : a refractory shiny black crystalline solid B4C ranking next to the diamond in hardness made usually by heating boric oxide and coke in an electric furnace and used chiefly as powdered… …   Useful english dictionary

  • Boron triiodide — chembox new ImageFileL1=Boron triiodide 3D balls.png ImageSizeL1=120px ImageFileR1=Boron triiodide 3D vdW.png ImageSizeR1=120px IUPACName=triiodoborane OtherNames= Reference= [RubberBible86th] Section1=Chembox Identifiers CASNo=13517 10 7 PubChem …   Wikipedia

  • boron nitride — Chem. a white powder, BN, formed by heating boron in nitrogen. In its ordinary form, it has a structure of stacked layers of hexagonal rings, very similar to that of graphite, and is used as a refractory electrical insulator. Cf. Borazon. * * * ▪ …   Universalium

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