Rare Earth Uses
In general, the rare earths are used in alloys, for their special optical properties, and in electronics. Some specific uses of elements include:
Scandium: Use to make light alloys for the aerospace industry, as a radioactive tracer, and in lamps
Yttrium: Used in yttrium aluminum garnet (YAG) lasers, as a red phosphor, in superconductors, in fluorescent tubes, in LEDs, and as a cancer treatment
Lanthanum: Use to make high refractive index glass, camera lenses, and catalysts
Cerium: Use to impart a yellow color to glass, as a catalyst, as a polishing powder, and to make flints
Praseodymium: Used in lasers, arc lighting, magnets, flint steel, and as a glass colorant
Neodymium: Used to impart violet color to glass and ceramics, in lasers, magnets, capacitors, and electric motors
Promethium: Used in luminous paint and nuclear batteries
Samarium: Used in lasers, rare earth magnets, masers, nuclear reactor control rods
Europium: Used to prepare red and blue phosphors, in lasers, in fluorescent lamps, and as an NMR relaxant
Gadolinium: Used in lasers, x-ray tubes, computer memory, high refractive index glass, NMR relaxation, neutron capture, MRI contrast
Terbium: Use in green phosphors, magnets, lasers, fluorescent lamps, magnetostrictive alloys, and sonar systems
Dysprosium: Used in hard drive disks, magnetostrictive alloys, lasers, and magnets
Holmium: Use in lasers, magnets, and calibration of spectrophotometers
Erbium: Used in vanadium steel, infrared lasers, and fiber optics
Thulium: Used in lasers, metal halide lamps, and portable x-ray machines
Ytterbium: Used in infrared lasers, stainless steel, and nuclear medicine
Lutetium: Used in positron emission tomography (PET) scans, high refractive index glass, catalysts, and LEDs