Silver ( Ag )

Material Information

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General Description:  

Silver was known to ancient civilisations.

Silver is a soft, malleable metal with a characteristic sheen. It has the highest thermal and electrical conductivities of all metals. It is generally found uncombined, or in the sulphide or arsenide ores from which it can be recovered as a cyanide complex which is subsequently reduced to the metal, in aqueous solution, by the use of zinc. The pure metal is stable to water and oxygen but is attacked in air by sulphur bearing compounds to form the characteristic black layer of silver sulphide. It is soluble in sulphuric and nitric acids.

Some silver salts are sensitive to light (e.g. AgI, AgCl and AgBr) and are of fundamental importance to photography. Other applications and industries in which silver is used include the manufacture of jewellery (both as the pure metal and as a constituent of various alloys), the electrical industry (e.g. in the manufacture of contacts) and for the silvering of glass.

   

Atomic Properties
     
Atomic number 47
Atomic radius - Goldschmidt ( nm ) 0.144
Atomic weight ( amu ) 107.8682
Crystal structure Face centred cubic
Electronic structure Kr 4d1O 5s1
Ionisation potential No. eV
1 7.58
2 21.5
3 34.8
Natural isotope distribution Mass No. %
107 51.83
109 48.17
Photo-electric work function ( eV ) 4.7
Thermal neutron absorption cross-section ( Barns ) 63.8
Valences shown 1, 2

Electrical Properties
     
Electrical resistivity @20C ( µOhmcm ) 1.63
Temperature coefficient @0-100C ( K-1 ) 0.0041
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) +0.74

Mechanical Properties
     
Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa ) 103.6
Hardness - Vickers 25 95
Izod toughness ( J m-1 ) 5
Poisson's ratio 0.367
Tensile modulus ( GPa ) 82.7
Tensile strength ( MPa ) 172 330

Physical Properties
     
Boiling point ( C ) 2212
Density @20C ( g cm-3 ) 10.5
Melting point ( C ) 961.9

Thermal Properties
     
Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 19.1
Latent heat of evaporation ( J g-1 ) 2390
Latent heat of fusion ( J g-1 ) 103
Specific heat @25C ( J K-1 kg-1 ) 237
Thermal conductivity @0-100C ( W m-1 K-1 ) 429


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 Insulated Wire Lump Mesh Microfoil Powder Rod Single Crystal Sphere Sputtering Target Tube Wire

Choose a form to search our on-line catalogue

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