niobium definition

  • noun:
    • A silvery, soft, ductile metallic element that occurs chiefly in columbite-tantalite and is used in steel alloys, arc welding, and superconductivity research. Atomic number 41; atomic weight 92.906; melting point 2,468°C; boiling point 4,927°C; specific gravity 8.57; valence 2, 3, 5. See Table at element.
    • a metallic substance element (icon Nb) with an atomic range 41.
    • The chemical element of atomic quantity 41. Chemical representation Nb. Atomic body weight 92.91. Previously called columbium. See additionally columbium.
    • Chemical symbolization, Nb; atomic fat, 94. A metal of steel-gray shade and brilliant luster.
    • a soft gray ductile metallic factor used in alloys; occurs in niobite; formerly called columbium

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