Austrian Mint

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COSMOLOGY Kosmologie Niobium Silver Bimetallic Coin 25€ Euro Austria 2015


Hot on the heals of our trailblazing 2014 coin, featuring two shades of niobium on both sides, comes our stunning 2015 offering, Cosmology. As ever, our innovative Silver Niobium series explores fittingly high-tech themes. This time, Cosmology brilliantly deploys its contrasting blue and yellow niobium hues to bring outer space just a little bit closer to home.

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Niobium, formerly columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. The name comes from Greek mythology: Niobe, daughter of Tantalus since it is so similar to tantalum.
Niobium has physical and chemical properties similar to those of the element tantalum, and the two are therefore difficult to distinguish. The English chemist Charles Hatchett reported a new element similar to tantalum in 1801 and named it columbium. In 1809, the English chemist William Hyde Wollaston wrongly concluded that tantalum and columbium were identical. The German chemist Heinrich Rose determined in 1846 that tantalum ores contain a second element, which he named niobium. In 1864 and 1865, a series of scientific findings clarified that niobium and columbium were the same element (as distinguished from tantalum), and for a century both names were used interchangeably. Niobium was officially adopted as the name of the element in 1949, but the name columbium remains in current use in metallurgy in the United States.
It was not until the early 20th century that niobium was first used commercially. Brazil is the leading producer of niobium and ferroniobium, an alloy of niobium and iron. Niobium is used mostly in alloys, the largest part in special steel such as that used in gas pipelines. Although these alloys contain a maximum of 0.1%, the small percentage of niobium enhances the strength of the steel. The temperature stability of niobium-containing superalloys is important for its use in jet and rocket engines. Niobium is used in various superconducting materials. These superconducting alloys, also containing titanium and tin, are widely used in the superconducting magnets of MRI scanners. Other applications of niobium include its use in welding, nuclear industries, electronics, optics, numismatics, and jewelry. In the last two applications, niobium's low toxicity and ability to be colored by anodization are particular advantages.

  • CountryAustria
  • Year2015
  • Face Value25 Euro
  • MetalSilver
  • Fineness (purity)900/1000
  • Weight (g)16.50
  • Diameter (mm)34
  • QualityBU - Brilliant Uncirculated
  • Mintage (pcs)65.000
  • Certificate (COA)Yes
  • Presentation case (box)Yes

On its obverse, Cosmology features an illustration of the universe in its niobium core, complete with stars, the planet Saturn and its rings, and the Rosetta space probe, the first ever spacecraft to orbit a comet. On the coin’s reverse, the planets in orbit encircle the European Extremely Large Telescope, which is currently under construction by the European Southern Observatory in the Atacama Desert of Chile and is due for completion in 2022. The telescope will enable us to look deeper than ever into the solar system, the galaxy and the universe, concepts illustrated on the coin’s outer silver rings. It may not answer the question: Are we alone in the universe? But it will certainly make a major contribution to the search for extra-terrestrial life.