Index

Palladium ( Pd )

Material Information

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General Description:  

Discovered in 1803 by W.H. Woollaston in London, England.

Palladium is a member of the platinum group of metals. It is silvery white in colour, is malleable and ductile, and is one of the most reactive in the group. It has an abundance of 6x10-6 in the earth's crust.

Palladium has good corrosion resistance but is soluble in oxidising acids and fused alkalis. It readily absorbs hydrogen gas (up to 900 times its own volume), but its main use is as a catalyst for hydrogenation. Palladium is also used within the electronics industry and in some dental applications.
   

Atomic Properties		      
Atomic number 46
Atomic radius - Goldschmidt ( nm ) 0.137
Atomic weight ( amu ) 106.42
Crystal structure Face centred cubic
Electronic structure Kr 4d1O
Ionisation potential No. eV
1 8.3
2 19.4
3 32.9
Natural isotope distribution Mass No. %
102 1.0
104 11.0
105 22.2
106 27.3
108 26.7
110 11.8
Photo-electric work function ( eV ) 5.0
Thermal neutron absorption cross-section ( Barns ) 6.0
Valences shown 2, 3, 4

Electrical Properties		      
Electrical resistivity @20C ( µOhmcm ) 10.8
Temperature coefficient @0-100C ( K-1 ) 0.0042
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) -0.57

Mechanical Properties		      
Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa ) 187
Hardness - Vickers 40 100
Poisson's ratio 0.39
Tensile modulus ( GPa ) 121
Tensile strength ( MPa ) 140-195 325
Yield strength ( MPa ) 34.5 205

Physical Properties		      
Boiling point ( C ) 3140
Density @20C ( g cm-3 ) 12.0
Melting point ( C ) 1554

Thermal Properties		      
Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 11.0
Latent heat of evaporation ( J g-1 ) 3398
Latent heat of fusion ( J g-1 ) 157
Specific heat @25C ( J K-1 kg-1 ) 244
Thermal conductivity @0-100C ( W m-1 K-1 ) 71.8


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 Microfoil Powder Rod Single-Crystal Sputtering-Target Tube Wire

Choose a form to search our on-line catalogue