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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 - Hafnium diboride HfB2   5 grams - 99.5%

Hafnium diboride HfB2 5 grams - 99.5%

Amount: 5g
Purity :~99.5%


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smart-elements - Mini-Hafnium Crystal Bar - 156.1g very shiny and clear!

Mini-Hafnium Crystal Bar - 156.1g very shiny and clear!

Amount: 156.1g
Purity :min. 99.9%


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smart-elements - 5 grams Hafnium beads in ampoule - 99.93% purity

5 grams Hafnium beads in ampoule - 99.93% purity

Amount: 1 St. / 1 pc.
Purity :99.93%


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smart-elements - High purity Hafnium disc Ø 1 inch x 1mm - 99.9% purity

High purity Hafnium disc Ø 1 inch x 1mm - 99.9% purity

Amount: 1 St. /1 pc.
Purity :>99.9%


1 pcs.: 23.00 € - tax free
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>9 pcs.: 21.00 €

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smart-elements - Very nice Hafnium Crystal Bar - 228g 99.9% purity

Very nice Hafnium Crystal Bar - 228g 99.9% purity

Amount: 228g
Purity :min. 99.9%


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smart-elements - High purity Hafnium metal bead -  2.69 grams 99.93%

High purity Hafnium metal bead - 2.69 grams 99.93%

Amount: 2.69g
Purity :99.93%


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smart-elements - High purity Hafnium metal bead -  2.98 grams 99.93%

High purity Hafnium metal bead - 2.98 grams 99.93%

Amount: 2.98g
Purity :99.93%


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smart-elements - high purity hafnium turning - 99.9% purity! 11.60g

high purity hafnium turning - 99.9% purity! 11.60g

Amount: 11.60g
Purity :99.9%


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smart-elements - high purity hafnium turning - 99.9% purity! 15.74g

high purity hafnium turning - 99.9% purity! 15.74g

Amount: 15.74g
Purity :99.9%


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smart-elements - 4 pc. Hafnium discs Ø 1/2 inch x 1mm - 99.9% purity

4 pc. Hafnium discs Ø 1/2 inch x 1mm - 99.9% purity

Amount: 4 St. / 4 pcs.
Purity :>99.9%


1 pcs.: 24.00 € - tax free
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smart-elements - Acrylic Element cube - Hafnium Hf - 50mm

Acrylic Element cube - Hafnium Hf - 50mm

Amount: 1 St.
Purity :99.9%


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smart-elements - High purity Hafnium disc Ø 7/8 inch x 1mm - 99.9% purity

High purity Hafnium disc Ø 7/8 inch x 1mm - 99.9% purity

Amount: 1 St. /1 pc.
Purity :>99.9%


1 pcs.: 17.00 € - tax free
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smart-elements - High purity Hafnium disc Ø 5/8 inch x 1mm - 99.9% purity

High purity Hafnium disc Ø 5/8 inch x 1mm - 99.9% purity

Amount: 1 St. /1 pc.
Purity :>99.9%


1 pcs.: 9.00 € - tax free
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smart-elements - High purity Hafnium metal bead - brushed surface 3.35 grams

High purity Hafnium metal bead - brushed surface 3.35 grams

Amount: 3.56g
Purity :99.9%


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smart-elements - Mini-Hafnium Crystal Bar - 36.08g very shiny and clear!

Mini-Hafnium Crystal Bar - 36.08g very shiny and clear!

Amount: 36.08g
Purity :99.9%


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