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Hf
Hafnium

History
 
This is one of the metal that was open only in the 20 st century. Its properties are similar to properties of zirconium, and still not found  different reactions. If the zirconium was discovered in the 17 century, the hafnium only in 1911 by Georges Urben, although they obtained the metal was not very clean. Scientists from the Institute for Theoretical Physics in Copenhagen Coster and Heveshi were able to prove the existence of the metal by using spectral analysis and gave him the title of hafnium, in honor of Copenhagen (Latin Hafnia). That was in 1923.
 
Nowadays

First, kinship hafnium with zirconium does not attach particular importance. But in the 20 century, it became clear that the zirconium cross-section electron capture is 0,19 bar, and a hafnium is 120. Therefore, its contents alloys of atomic industry must not exceed 0.01%. The rods in nuclear reactors are made of hafnium. It is added to alloy steel, as well as hafnium was enough against corrosion to hot water. It makes heatproof  alloys.

Date ASIA EUROPE USA
26/12/2009 878.73 878.73 878.73
19/12/2009 878.73 878.73 878.73
12/12/2009 878.78 878.78 878.78
05/12/2009 878.87 878.87 878.87
28/11/2009 891.17 891.17 891.17
21/11/2009 878.76 878.76 878.76
14/11/2009 890.91 890.91 890.91
07/11/2009 904.97 904.97 904.97
31/10/2009 883 883 883
24/10/2009 900.58 900.58 900.58
17/10/2009 878.89 878.89 878.89
10/10/2009 878.95 878.95 878.95
02/10/2009 878.95 878.95 878.95
25/09/2009 878.84 878.84 878.84
18/09/2009 879.93 879.93 879.93
12/09/2009 878.61 878.61 878.61
05/09/2009 883 883 883
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