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niobium    音标拼音: [n,ɑɪ'obiəm]
n. 铌

铌

niobium
n 1: a soft grey ductile metallic element used in alloys; occurs
in niobite; formerly called columbium [synonym: {niobium},
{Nb}, {atomic number 41}]

Columbium \Co*lum"bi*um\, n. [NL., fr. Columbia America.]
(Chem.)
A rare element of the vanadium group, first found in a
variety of the mineral columbite occurring in Connecticut,
probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now
more commonly called {niobium}.
[1913 Webster]


niobium \ni*o"bi*um\, n. [NL., fr. L. & E. {Niobe}.] (Chem.)
The chemical element of atomic number 41. Chemical symbol Nb.
Atomic weight 92.91. Previously called {columbium}. See also
{Columbium}.
[1913 Webster]

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  • Niobium - Wikipedia
    Niobium is a chemical element; it has symbol Nb (formerly columbium, Cb) and atomic number 41 It is a light grey, crystalline transition metal Pure niobium has a Mohs hardness rating similar to pure titanium, [8] and it has similar ductility to iron Niobium oxidizes in Earth's atmosphere very slowly, hence its application in jewelry as a hypoallergenic alternative to nickel Niobium is
  • Niobium | Properties, Uses, History of the Chemical Element - Britannica
    Niobium, chemical element, refractory metal of Group 5 (Vb) of the periodic table, used in alloys, tools and dies, and superconductive magnets Niobium is closely associated with tantalum in ores and in properties
  • Niobium - Element information, properties and uses | Periodic Table
    Uses and properties The propeller blades in the icon reflect the use of niobium and its alloys in the aviation industry A silvery metal that is very resistant to corrosion due to a layer of oxide on its surface The main source of this element is the mineral columbite This mineral also contains tantalum and the two elements are mined together
  • Facts About Niobium - Live Science
    Properties, sources and uses of the element niobium, and facts about its unusual history
  • What is Niobium? - Vital Metals
    What is Niobium? Niobium (Nb) is a ductile refractory metal that is highly resistant to heat and wear It is resistant to corrosion owing to the formation of a surface oxide layer Approximately 90% of niobium use is attributed to the steel industry, predominantly as a micro alloy with iron
  • Niobium Facts, Symbol, Discovery, Properties, Uses
    Niobium element information, molecular formula, family, discovery date, what are its physical, chemical, atomic properties (color, density), cost, pictures
  • Niobium and Tantalum Statistics and Information - USGS. gov
    Niobium and columbium are synonymous names for the chemical element with atomic number 41; columbium was the name given in 1801, and niobium (Nb) was the name officially designated by the International Union of Pure and Applied Chemistry in 1950 Niobium in the form of ferroniobium is used worldwide, mostly as an alloying element in steels and in superalloys Appreciable amounts of niobium in
  • Niobium Element Facts - chemicool. com
    Niobium's properties, discovery, videos, images, states, energies, appearance and characteristics
  • Niobium: Properties, Uses, and Applications in Industry and Medicine
    Niobium, identified by its atomic number 41, is a soft, grey, crystalline, ductile transition metal in the periodic table It has notable importance in various industries, including aerospace, electrical, and medical fields
  • Periodic Table of Elements: Los Alamos National Laboratory
    Niobium is a shiny, white, soft, and ductile metal, and takes on a bluish cast when exposed to air at room temperatures for a long time The metal starts to oxidize in air at 200°C, and when processed at even moderate temperatures must be placed in a protective atmosphere





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