Hafnium

Hafnium is a silvery coloured, ductile metal which is found in all minerals containing zirconium. The chemistries of the two metals are similar which makes them difficult to separate, and the properties of each are greatly affected by the presence of the other as an impurity. Both zirconium and hafnium are extracted as the pure metal by reducing the tetrahalide with magnesium, the whole process being carried out under argon as both metals readily combine with other gases (e.g. nitrogen). Hafnium will resist corrosion in air due to the formation of an oxide film, although powdered hafnium will burn in air. It is unaffected by alkalis and acids, with the exception of HF. Hafnium can be used to control recrystallisation of tungsten filaments but its main application is as control rod material in nuclear reactors due to its ability to absorb neutrons. The ability of hafnium to absorb neutrons means that it can sometimes be an annoying impurity in zironium metal which is used for nuclear engineering.


Symbol
Hf

Discovered
1923 by D. Coster and G.C. von Hevesey in Copenhagen, Denmark.

Abundance
5.3 ppm of the Earth's crust.

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Atomic number 72 Clip
Atomic / Molecular Weight 178.49 gmol-1Clip
Density 13276 kgm-3Clip
Crystal Structure hcp / bcc at 2050K Clip
Lattice constant 319 fmClip
Melting Point 2503 KClip
Boiling Point 5573 KClip
Specific heat capacity 146 Jkg-1K-1Clip
Thermal conductivity 23 Wm-1K-1Clip
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See also: Periodic Table, Zirconium.

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Subjects: Chemistry