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Indium ( In )

Material Information

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Bar Foil Lump Powder Rod Sputtering Target Wire
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General Description:  

Discovered in 1863 by F. Reich and H. Richter in Freiberg, Germany.

Indium derives its name from the characteristic indigo line in its spectrum. It is a soft, malleable and ductile metal which is generally unaffected by air or water but is soluble in acids. It is found only in the form of minor components of various minerals (as are gallium and thallium, other members of the boron group of elements in the periodic table) and the pure element is produced by electrolytic reduction in aqueous solution. It has an abundance in the earth's crust of 0.049 ppm.

Indium has a large cross-section for slow neutrons and is, therefore, readily activated. Indium is used in the forms of InAs and InSb within the semiconductor industry in thermistors and transistors. As a result of its physical properties, it is particularly suited to being used as a sealing material in vacuum systems and also as bonding material in acoustic transducers. Indium is also widely used in the manufacture of "fusible" materials, a range of alloys which have low melting points and can be used as thermal fuses and solders.

   

Atomic Properties

Atomic number 49
Atomic radius - Goldschmidt ( nm ) 0.157
Atomic weight ( amu ) 114.82
Crystal structure Face centred tetragonal
Electronic structure Kr 4d1O 5s2 5p1
Ionisation potential No. eV
1 5.79
2 18.9
3 28.0
4 54
Natural isotope distribution Mass No. %
113 4.3
115 95.7
Photo-electric work function ( eV ) 4.12
Thermal neutron absorption cross-section ( Barns ) 194
Valences shown 1, 2, 3

Electrical Properties

Electrical resistivity @20C ( µOhmcm ) 8.8
Temperature coefficient @0-100C ( K-1 ) 0.0052
Superconductivity critical temperature ( K ) 3.41
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) +0.69

Mechanical Properties

Material condition Soft Polycrystalline
Bulk modulus ( GPa )   35.3
Hardness - Vickers <10
Poisson's ratio   0.45
Tensile modulus ( GPa )   10.6
Tensile strength ( MPa ) 2.6-4.5

Physical Properties

Boiling point ( C ) 2080
Density @20C ( g cm-3 ) 7.3
Melting point ( C ) 156.6

Thermal Properties

Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 24.8
Latent heat of evaporation ( J g-1 ) 2024
Latent heat of fusion ( J g-1 ) 28.5
Specific heat @25C ( J K-1 kg-1 ) 234
Thermal conductivity @0-100C ( W m-1 K-1 ) 81.8

Buy Indium on-line

We stock and supply the following standard forms:
Bar Foil Lump Powder Rod Sputtering Target Wire
Bar Foil Lump Powder Rod Sputtering Target Wire

Choose a form to search our on-line catalogue  

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