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Hf
Hafnium
Atomic no.:
72
Atom. weight: 178.49
Density: 13.31
Class:
refractory metal
Melting point: 2227°C
Boiling point: 4602°C
Colour: Array
   
Discoverer: Dirk Coster and György K. von Hevesy
Place: Copenhagen, Denmark
Year: 1923

Discovered in 1923 by D. Coster and G.C. von Hevesey in Copenhagen, Denmark. Hafnium is a silvery colored, 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). The abundance of hafnium in the earth's crust is 5.3 ppm. 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 recrystallization 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.

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smart-elements - Acrylic Element cube - Hafnium Hf - 50mm

Acrylic Element cube - Hafnium Hf - 50mm

Amount: 1 St.
Purity :99.9%


1 pcs.: 68.00 € - tax free

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smart-elements - Big Hafnium melted nugget, ~ 19.78g, 99,9% purity!

Big Hafnium melted nugget, ~ 19.78g, 99,9% purity!

Amount: 1 St. / 1 pc.
Purity :99,9% min.


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smart-elements - Big Hafnium melted nugget, ~ 19.43g, 99,9% purity!

Big Hafnium melted nugget, ~ 19.43g, 99,9% purity!

Amount: 1 St. / 1 pc.
Purity :99,9% min.


1 pcs.: 89.00 € - tax free

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smart-elements - Mini-Hafnium Crystal Bar - 33.0g very shiny and clear!

Mini-Hafnium Crystal Bar - 33.0g very shiny and clear!

Amount: 33.0g
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 28.54g very shiny and clear!

Mini-Hafnium Crystal Bar - 28.54g very shiny and clear!

Amount: 28.54g
Purity :99.9%


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smart-elements - Big Hafnium melted nugget, ~ 19.20g, with oxide colors

Big Hafnium melted nugget, ~ 19.20g, with oxide colors

Amount: 19g
Purity :99,9% min.


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smart-elements - High purity hafnium metal rod >42mm length - 11.5mm diameter

High purity hafnium metal rod >42mm length - 11.5mm diameter

Amount: 57.4g
Purity :>99.9%


1 pcs.: 338.00 € - tax free

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smart-elements - Mini-Hafnium Crystal Bar - 31.12g very shiny and clear!

Mini-Hafnium Crystal Bar - 31.12g very shiny and clear!

Amount: 31.12g
Purity :99.9%


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smart-elements - High purity Hafnium disc  99.95% - Ø200mm x 6mm - 2640 grams

High purity Hafnium disc 99.95% - Ø200mm x 6mm - 2640 grams

Amount: 2640g
Purity :99,95%


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smart-elements - Mini-Hafnium Crystal Bar - 30.11g very shiny and clear!

Mini-Hafnium Crystal Bar - 30.11g very shiny and clear!

Amount: 30.11g
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 28.68g very shiny and clear!

Mini-Hafnium Crystal Bar - 28.68g very shiny and clear!

Amount: 28.68g
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 31.16g very shiny and clear!

Mini-Hafnium Crystal Bar - 31.16g very shiny and clear!

Amount: 31.16g
Purity :99.9%


1 pcs.: SOLD!

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smart-elements - Acrylic Element-block Hafnium Hf - 50mm

Acrylic Element-block Hafnium Hf - 50mm

Amount: 1 St.
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 27.58g very shiny and clear!

Mini-Hafnium Crystal Bar - 27.58g very shiny and clear!

Amount: 27.58g
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 34.97g very shiny and clear!

Mini-Hafnium Crystal Bar - 34.97g very shiny and clear!

Amount: 34.97g
Purity :99.9%


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