Zinc ( Zn )

Material Information

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General Description:  

Zinc was known to the Greeks and Romans as a constituent of the copper alloy, brass, but metallic zinc was not discovered until the 16th. century by Paracelcus.

Zinc is a brittle metal which has a blue cast. It is readily accessible as it occurs in concentrated ores from which it is easily extracted (it has an abundance of 75 ppm in the earth's crust). Extraction is achieved by heating the oxide with carbon and distilling out the metal. Zinc tarnishes in air and reacts with acids and alkalis.

Zinc is used widely throughout industry; for example, it is used as a galvanic coating on steel to prevent corrosion, and is used as a constituent of various alloy systems (e.g. with copper in brass), as well as in zinc-base alloys which can be used for diecasting (the other alloy constituents are aluminium, copper and magnesium). Pure zinc is used as an electrode in a Daniell cell and also in dry batteries. Zinc oxide is used as a stabiliser for certain grades of rubbers and plastics, as well as a non-toxic, white pigment used in paint manufacture. Zinc oxide also has astringent and soothing qualities and is used as a constituent of creams and ointments.

   

Atomic Properties
     
Atomic number 30
Atomic radius - Goldschmidt ( nm ) 0.137
Atomic weight ( amu ) 65.38
Crystal structure Hexagonal close packed
Electronic structure Ar 3d1O 4s2
Ionisation potential No. eV
1 9.39
2 17.96
3 39.7
4 59.4
5 82.6
6 108
Natural isotope distribution Mass No. %
64 48.6
66 27.9
67 4.1
68 18.8
70 0.6
Photo-electric work function ( eV ) 4.3
Thermal neutron absorption cross-section ( Barns ) 1.10
Valences shown 2

Electrical Properties
     
Electrical resistivity @20C ( µOhmcm ) 5.96
Temperature coefficient @0-100C ( K-1 ) 0.0042
Superconductivity critical temperature ( K ) 0.85
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) +0.76

Mechanical Properties
     
Material condition Polycrystalline
Bulk modulus ( GPa ) 69.4
Hardness - Mohs 2.5
Poisson's ratio 0.249
Tensile modulus ( GPa ) 104.5

Physical Properties
     
Boiling point ( C ) 907
Density @20C ( g cm-3 ) 7.14
Melting point ( C ) 419.5

Thermal Properties
     
Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 31.0
Latent heat of evaporation ( J g-1 ) 1748
Latent heat of fusion ( J g-1 ) 111
Specific heat @25C ( J K-1 kg-1 ) 388
Thermal conductivity @0-100C ( W m-1 K-1 ) 116


All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Standard products are available in these forms
Foil Lump Powder Rod Single Crystal Sputtering Target Wire

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