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| rare earth elements | |
|---|---|
| Name | Rare earth elements |
| Appearance | silvery-white metals |
| Atomic numbers | 57–71, 21, 39 |
| Symbols | La–Lu, Sc, Y |
| Category | lanthanides and related elements |
rare earth elements Rare earth elements are a set of chemical elements primarily comprising the lanthanide series plus scandium and yttrium. They are central to modern high-technology industries and strategic supply chains that involve nations such as China, United States, European Union, Japan, and South Korea. Their unique electronic, magnetic, and optical properties underpin innovations tied to entities like Tesla, Inc., Siemens, Raytheon Technologies, Samsung Electronics, and research at institutions including Massachusetts Institute of Technology, Chinese Academy of Sciences, and Fraunhofer Society.
Rare earth elements typically refer to fifteen lanthanides (lanthanum through lutetium) plus the transition elements Scandium and Yttrium. The group figures prominently in discussions among policy actors such as World Trade Organization negotiators and regulators like the U.S. Department of Energy and European Commission because of supply concentration and strategic importance for projects like Artemis program and defense procurement by North Atlantic Treaty Organization. Historical milestones involving their discovery and commercialization connect to figures and institutions including Carl Gustav Mosander, Johann Gadolin, Royal Society, and companies like Molycorp, Inc. and China Northern Rare Earth Group.
Chemically, lanthanides exhibit trivalent oxidation states and display gradual lanthanide contraction across the series, a concept discussed in texts from Royal Society of Chemistry and courses at University of Cambridge. Their electronic configurations (4f orbitals) yield sharp emission and absorption features exploited in devices by General Electric and Philips. Magnetic phenomena such as high coercivity in neodymium magnets link to collaborations between Bell Labs and Hitachi. Spectroscopic techniques developed at Lawrence Berkeley National Laboratory and CERN characterize crystal-field splitting and charge-transfer effects relevant to luminescent materials used in companies like Osram.
Rare earth elements occur in minerals such as bastnäsite, monazite, and xenotime found in geological provinces like the Bayan Obo Mining District, Mountain Pass, California, and Brazilian state of Minas Gerais. Their geochemical behavior concentrates them in carbonatites, peralkaline granites, and heavy-mineral placers studied by researchers at United States Geological Survey and Geological Survey of India. Exploration projects often involve partnerships between firms such as Lynas Corporation and national agencies like Australian Government resource departments. Past events like trade tensions between People's Republic of China and Japan highlighted the geopolitical sensitivity of deposits.
Extraction workflows begin with open-pit or placer mining at sites managed by operators including Rio Tinto subsidiaries and smaller firms like MP Materials. Processing involves beneficiation, cracking, solvent extraction, and ion-exchange steps developed at laboratories such as Oak Ridge National Laboratory and industrialized by companies like China Minmetals. Environmental regulations enforced by agencies such as U.S. Environmental Protection Agency and Ministry of Ecology and Environment (China) affect tailings management and radiological controls for thorium and uranium co-products. Technology transfer, licensing, and partnerships—examples include collaborations between Hydrometallurgy Research Institute and private firms—shape capacity-building in regions like Western Australia and Inner Mongolia.
Rare earths enable permanent magnets in electric motors used by BMW, Toyota Motor Corporation, and Volkswagen Group; phosphors in displays manufactured by LG Electronics and Sony; catalysts in petroleum refining at companies like ExxonMobil; and polishing compounds in optics production for NASA missions and observatories such as European Southern Observatory. They are also critical in medical devices made by firms like Siemens Healthineers and imaging equipment developed at Mayo Clinic. Other uses include hydrogen storage materials researched at Argonne National Laboratory and scintillators for particle detectors at Fermilab.
Mining and processing can generate radioactive waste (thorium, uranium) and chemical effluents regulated by entities such as International Atomic Energy Agency and national ministries. Studies from Harvard University and Peking University document ecological effects on watersheds near extraction sites like Bayan Obo and Mountain Pass. Occupational exposure standards are set by organizations such as Occupational Safety and Health Administration and World Health Organization; remediation and recycling initiatives involve firms and programs linked to Circular Economy Action Plan and industry consortia including Rare Earth Industry Association.
Global supply chains concentrate production and refining capacity in actors like China National Chemical Corporation and exporters in regions influenced by policy instruments from White House trade offices and European Council. Market dynamics—price spikes, export controls, and strategic stockpiling—have engaged institutions such as International Monetary Fund and prompted investments by sovereign entities like Norwegian Government Pension Fund Global and state-owned enterprises. Strategic reports by RAND Corporation and policy briefings from Chatham House analyze scenarios including supply diversification, recycling, and substitution pursued by industrial consortia and energy transition initiatives led by entities like International Energy Agency.
Category:Chemical element groups