Sentence Examples


  • Chemically related to vanadium are the two elements tantalum and columbium or niobium.
  • Tantalum has in recent years been turned to economic service, being employed, in the same manner as tungsten, for the production of the filaments employed in incandescent electric lighting.
  • It is usually found associated with tantalum, the chief minerals containing these two elements being tantalite, columbite, fergusonite and yttrotantalite; it is also a constituent of pyrochlor, euxenite and samarskite.
  • It is then dissolved in hydrofluoric acid and heated in order to expel silicon fluoride; finally the columbium, tantalum and titanium fluorides are separated by the different solubilities of their double fluorides (C. Marignac, Ann.
  • Columbium pentoxide (columbic acid), Cb205, is obtained from columbite, after the removal of tantalum (see above).

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