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Nichel ( Ni )

Informazioni sul Materiale

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Cristallo singolo Crogiolo Filo Filo isolato Foglio Microfoglio Pezzo grezzo Polvere Rete
Schiuma Sfera Sputtering Target Tondino Tubo
Schiuma Sfera Sputtering Target Tondino Tubo

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General Description:  

Discovered by A.F. Cronstedt in 1751 in Stockholm, Sweden.

Nickel is a silver-white metal which occurs mainly in the sulphide and arsenic ores. It is extracted by roasting to NiO and then reducing using carbon. Pure nickel is manufactured by the Mond process, in which impure nickel is reacted with carbon monoxide (CO) to produce Ni(CO)4, which is then decomposed at 200C to yield 99.99% Ni. Nickel has an abundance of 80 ppm in the earth's crust.

Pure nickel is malleable and ductile, and is resistant to corrosion in air or water, and hence is used as a protective coating. It is readily soluble in dilute acids, but is unaffected by alkalis. Applications for nickel include its use as a constituent of various alloy types; for example, Nichrome (an alloy used for resistance heating elements), Monel (corrosion resistant material), Permalloy (an alloy with high magnetic permeability at low field strength and low hysteresis loss), stainless steel, cupro-nickel, nickel silver, etc. It is also used in coinage, as a protective coating and within food and chemical handling plants.

Nickel is classed as a carcinogen and is also an allergen to some individuals. It is found in many dietary constituents and, as such, is difficult to avoid.

   

Atomic Properties

Atomic number 28
Atomic radius - Goldschmidt ( nm ) 0,125
Atomic weight ( amu ) 58,69
Crystal structure Face centred cubic
Electronic structure Ar 3d8 4s2
Ionisation potential No. eV
1 7.63
2 18.2
3 35.2
4 54.9
5 75.5
6 108
Natural isotope distribution Mass No. %
58 68.27
60 26.10
61 1.13
62 3.59
64 0.91
Photo-electric work function ( eV ) 4,9
Thermal neutron absorption cross-section ( Barns ) 4,54
Valences shown 0, 1, 2, 3

Electrical Properties

Electrical resistivity @20C ( µOhmcm ) 6,9
Temperature coefficient @0-100C ( K-1 ) 0,0068
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) -1,48

Mechanical Properties

Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa )     177,3
Hardness - Brinell 100 190
Izod toughness ( J m-1 ) 160 160
Poisson's ratio     0,312
Tensile modulus ( GPa )     199,5
Tensile strength ( MPa ) 400 660
Yield strength ( MPa ) 150 480

Physical Properties

Boiling point ( C ) 2732
Density @20C ( g cm-3 ) 8,9
Melting point ( C ) 1453

Thermal Properties

Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 13,3
Latent heat of evaporation ( J g-1 ) 6378
Latent heat of fusion ( J g-1 ) 292
Specific heat @25C ( J K-1 kg-1 ) 444
Thermal conductivity @0-100C ( W m-1 K-1 ) 90,9

Buy Nichel on-line

Standard products are available in these forms
Cristallo singolo Crogiolo Filo Filo isolato Foglio Microfoglio Pezzo grezzo Polvere Rete
Cristallo singolo Crogiolo Filo Filo isolato Foglio Microfoglio Pezzo grezzo Polvere Rete
Schiuma Sfera Sputtering Target Tondino Tubo
Schiuma Sfera Sputtering Target Tondino Tubo

Choose a form to search our on-line catalogue  

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