Home - Periodic Tables
(from the brilliant indigo line in its spectrum) Discovered by Reich and Richter, who
later isolated the metal. Until 1924, a gram or so constituted the world's supply of this
element in isolated form. It is probably about as abundant as silver. About 4 million troy
ounces of indium are now produced annually in the Free World. Canada is presently
producing more than 1,000,000 troy ounces annually.
Indium is most frequently associated with zinc materials, and it is from these that
most commercial indium is now obtained; however, it is also found in iron, lead, and
The present cost of indium is about $1 to $5/g, depending on quantity and purity.
It is available in ultra pure form. Indium is a very soft, silvery-white metal with a
brilliant luster. The pure metal gives a high-pitched "cry" when bent. It wets
glass, as does gallium.
It has found application in making low-melting allows; an allow of 24% indium - 76%
gallium is liquid at room temperature. It is used in making bearing alloys, germanium
transistors, rectifiers, thermistors, and photoconductors. It can be plated onto metal and
evaporated onto glass, forming a mirror as good as that made with silver but with more
resistance to atmospheric corrosion.
There is evidence that indium has a low order of toxicity; however, care should be
taken until further information is available.
Sources: CRC Handbook of Chemistry
and Physics and the American Chemical Society.