Light emmiting diodes (LEDs)
Because of its semimetallic properties, arsenic is used in metallurgical applications as an additive metal. Additions of 2% of arsenic to lead assists in the manufacture of lead shot to improve its sphericity. The addition of up to 3% arsenic to lead-base bearing alloys improves both their mechanical and high temperature properties. A small amount of arsenic is added to lead-base battery grid metal and cable sheating to improve the hardness of these materials.
In minor additions arsenic will improve the corrosion resistance and raise the recrystallization temperature of copper. In amounts of 0.15 - 0.50%, arsenic improves the high temperature applications of copper utensils.
High-purity arsenic is used in semiconductor technology to produce gallium arsenide. This compound finds application in semiconductor devices as diodes, transistors and lasers. Indium arsenide is used for infrared detectors and in Hall effect applications. Small quantities are also used as a dopant in germanium and silicon devices.