21. Zirconium and niobium alloys used in the nuclear industry are routinely VAR processed. 22. The NbO 2 is subsequently reacted with magnesium vapour to produce niobium metal. 23. The characteristics of niobium electrolytic capacitors and tantalum electrolytic capacitors are roughly comparable. 24. For niobium this behavior was known since the beginning of the 20th century. 25. However, solid polymer niobium electrolytic capacitors do have a life time specification. 26. Niobium is for Niobe, Tantalus'daughter.27. The coin has a silver ring and gold-brown niobium " pill ". 28. It was not until the early 20th century that niobium was first used commercially. 29. Ferroniobium contains between 60 and 70 % niobium . 30. Granitic rocks and also in carbonatite intrusions where it may also contain anomalous niobium .
