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. 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.


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

0.049 ppm of the earth’s crust.

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Atomic number 49 Clip
Atomic / Molecular Weight 114.82 gmol-1Clip
Density 7290 kgm-3Clip
Lattice constant 325 fmClip
Melting Point 429.794 KClip
Boiling Point 2323 KClip
Linear expansivity 0.0000321 K-1Clip
Specific heat capacity 238 Jkg-1K-1Clip
Thermal conductivity 84 Wm-1K-1Clip
Electromotive Series 0.336 VClip
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See also: Fields Metal, Indium Antimonide, Indium Arsenide, Indium Gallium Aluminium Nitride, Indium Gallium Arsenide, Indium Gallium Nitride, Indium Gallium Phosphide, Indium I Bromide, Indium III Bromide, Indium III Chloride, Indium III Fluoride, Indium III Oxide, Indium III Selenide, Indium III Sulphate, Indium III Sulphide, Indium III Telluride, Indium Nitride, Indium Phosphide, Indium Tin Oxide, Periodic Table.

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Subjects: Chemistry