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boron powder

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  • Boron nitride — IUPAC name Boron nitride Identifiers …   Wikipedia

  • 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 — ► 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 — [bôr′än΄] n. [< earlier boracium (< BORAX) + on, as in (CARB)ON: so named by DAVY Sir Humphry, who isolated it (1808)] a nonmetallic chemical element occurring only in combination, as with sodium and oxygen in borax, and produced in the… …   English World dictionary

  • 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 — 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 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

  • Boron carbide — Chembox new Name = Boron carbide ImageFile = ImageSize = ImageName = Boron carbide IUPACName = Boron carbide OtherNames = Tetrabor B4 C B4C Black Diamond Section1 = Chembox Identifiers CASNo = 12069 32 8 Section2 = Chembox Properties Formula =… …   Wikipedia

  • 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 — A nonmetallic trivalent element, atomic no. 5, atomic wt. 10.811; occurs as a hard crystalline mass or as a brown powder, and forms borates and boric acid. A nutritional need has been reported for pregnant women. [Pers. Burah] * * * bo·ron bō(ə)r …   Medical dictionary

  • boron — [ bɔ:rɒn] noun the chemical element of atomic number 5, a non metal which can be isolated as a brown, amorphous powder or (if pure) a black crystalline semiconductor. (Symbol: B) Origin C19: from borax, on the pattern of carbon (which it… …   English new terms dictionary

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