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Rodio ( Rh )

Informazioni sul Materiale

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General Description:  

Rhodium was discovered in 1803 by W.H. Woolaston in London.

One of the rarest metals on earth (abundance of 2 x 10 4 ppm), rhodium does not appear naturally, tending to be found with other platinum group metals. It is a hard, lustrous, silvery coloured metal which is stable in air. Rhodium is inert to all acids but is attacked by fused alkalis.

The metal has high thermal and electrical conductivities and is alloyed with platinum to form the positive wire of a Pt/Rh - Pt thermocouple. Other applications of the material include its use as a plating material (to provide a hard and bright surface which is resistant to oxidation), as a catalyst and also as an alloying element, where it improves the hardness of the resulting alloy.

   

Atomic Properties

Atomic number 45
Atomic radius - Goldschmidt ( nm ) 0,134
Atomic weight ( amu ) 102,9055
Crystal structure Face centred cubic
Electronic structure Kr 4d8 5s1
Ionisation potential No. eV
1 7.46
2 18.1
3 31.1
Natural isotope distribution Mass No. %
103 100
Photo-electric work function ( eV ) 4,6
Thermal neutron absorption cross-section ( Barns ) 150
Valences shown 2, 3, 4, 5, 6

Electrical Properties

Electrical resistivity @20C ( µOhmcm ) 4,7
Temperature coefficient @0-100C ( K-1 ) 0,0044
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) +0,70

Mechanical Properties

Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa )     276
Hardness - Vickers 120 300
Poisson's ratio     0,26
Tensile modulus ( GPa )     379
Tensile strength ( MPa ) 690-760 1380-2070
Yield strength ( MPa ) 69-275

Physical Properties

Boiling point ( C ) 3727
Density @20C ( g cm-3 ) 12,4
Melting point ( C ) 1965

Thermal Properties

Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 8,5
Latent heat of evaporation ( J g-1 ) 4800
Latent heat of fusion ( J g-1 ) 210
Specific heat @25C ( J K-1 kg-1 ) 244
Thermal conductivity @0-100C ( W m-1 K-1 ) 150

Buy Rodio on-line

Standard products are available in these forms
Cristallo singolo Filo Foglio Microfoglio Pezzo grezzo Polvere Sputtering Target Tondino
Cristallo singolo Filo Foglio Microfoglio Pezzo grezzo Polvere Sputtering Target Tondino

Choose a form to search our on-line catalogue  

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