Uses

Indium is used for coating high speed bearings, transistors, rectifiers, thermistors, and photoconductors. Indium is also used in low melting alloys.   An alloy of 24% indium and 76% gallium is a liquid at room temperature.  Indium makes good mirrors; an indium mirror is more resistant to corrosion.  Indium can be put on to metal or evaporated onto glass to form a good mirror.   Presently, indium costs about $1 to $5 per gram.

Some common compounds of Indium are:

• Indium Chloride:

  In³⁺ + 3Cl^- --> InCl₃

• Indium Oxide:

  2In³⁺ + 3O^2- --> In₂O₃

• Indium Sulfate:

  2In³⁺ + 3SO₄ ^2- --> In₂(SO₄)₃