Chemical element Niobium - реферат по английскому языку

 

Тезисы:

  • Brazil is the leading producer of niobium and ferroniobium, an alloy of niobium and iron.
  • Niobium is used in various superconducting materials.
  • The fluorides of niobium can be used after its separation from tantalum.
  • Niobium sulfide as well as a few interstitial compounds of niobium with silicon are also known.
  • The free element is not found in nature, but it does occur in minerals.
  • With this method niobium with a relatively high purity can be obtained.
  • The ferroniobium contains between 60 and 70% of niobium.
  • Without addition of iron oxide, aluminothermic process is used for the production of niobium.
  • Niobium precipitates a hardening ?''-phase within the grain structure of the superalloy.
  • The alloys contain up to 6.5% niobium.
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