Praseodymium: Rare-earth magnets, lasers, core material for carbon arc lighting, colorant in glasses and enamels, additive in didymium glass used in welding goggles

Neodymium: Rare earth magnets, lasers, violet colors in glass and ceramics, didymium glass, ceramic capacitors

Samarium: Rare earth magnets, lasers, neutron capture, masers

Europium: Red and blue phosphors, lasers, mercury-vapor lamps, fluorescent lamps, NMR relaxation agent

Gadolinium: Rare-earth magnets, high refractive index glass or garnets, lasers, X-ray tubes, computer memories, neutron capture, MRI contrast agent, NMR relaxation agent, magnetostrictive alloys such as Galfenol, steel additive

• Motors

• Disc drives & disk drive motors

• Power generation

• Actuators

• Microphones & speakers

• MRI

• Anti-lock brake system

• Automotive parts

• Communication systems

• Electric drive & propulsion