Introduction
Rare Earth Elements (REEs) or Rare Earth Metals are a collection of 17 chemical elements in the periodic table, constituting 15 lanthanides plus scandium and yttrium. The 15 lanthanides are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. Other than promethium, all other lanthanides occur naturally.
REEs are divided into "light" and "heavy" groups; the light rare earth metals are lanthanum to samarium and the heavy rare earth metals are europium to lutetium.
Exhibit 1: Periodic Table
Applications
Aerospace and Defense
REEs are used in many electronic, optical, and magnetic applications. Rare earth magnets (which are produced from Rare Earth Metals) are incredibly powerful; some can retain their magnetic strength at hightemperatures, making them ideal for commercial and aerospace applications. REEs are also used for lasers and resolution technologies. These technologies are critical to modern aerospace systems.
Health Care
Rare earth magnets produce a powerful magnetic field used in medical imaging devices, such as MRIs, that helpdoctors diagnose illnesses that otherwise would have been much harder to detect. REEs are also used in modern surgical machines for robot-assisted surgeries. Yttrium is used in solid state lasers and in cancer-treating drugs.
Clean Energy
REEs are used in advanced energy technologies, including wind turbines, electric car batteries, and energy-efficient lights, which help to reduce CO2 and other emissions. REEs are essentially used in compact fluorescent lighting (CFLs), LED lighting, and fiber optics. Emerging technology using rare earth magnets and magnetic refrigeration can improve the energy efficiency of refrigerators for home and commercial use.
Electronics
REEs make color displays more vivid in televisions, computer screens, and other devices. They are also important for headphones, microphones, loudspeakers, optical fibers, smartphones, tablets, and computers. Some other applications include europium used in cathode ray tubes (CRT) and liquid crystal displays (LCD), erbium used in fiber optic cables, lanthanum used in fuel cells, and several rare earadidas

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