Risultati di ricerca
The rare-earth elements (REE), also called the rare-earth metals or rare earths or, in context, rare-earth oxides, and sometimes the lanthanides (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals.
- Classification of Rare Earths
- Summary of Abbreviations
- Rare Earth Uses
- Sources
The classification of the rare earth elements is as hotly disputed as the list of included metals. One common method of classification is by atomic weight. Low atomic weight elements are the light rare earth elements (LREEs). Elements with high atomic weight are the heavy rare earth elements (HREEs). Elements that fall between the two extremes are ...
Several abbreviations are used in connection with the rare earth elements: 1. RE: rare earth 2. REE: rare earth element 3. REM: rare earth metal 4. REO: rare earth oxide 5. REY: rare earth element and yttrium 6. LREE: light rare earth elements 7. MREE: middle rare earth elements 8. HREE: heavy rare earth elements
In general, the rare earths are used in alloys, for their special optical properties, and in electronics. Some specific uses of elements include: 1. Scandium: Use to make light alloys for the aerospace industry, as a radioactive tracer, and in lamps 2. Yttrium: Used in yttrium aluminum garnet (YAG) lasers, as a red phosphor, in superconductors, in ...
Brownlow, Arthur H. (1996). Geochemistry. Upper Saddle River, N.J.: Prentice Hall. ISBN 978-0133982725.Connelly, N. G. and T. Damhus, ed. (2005). Nomenclature of Inorganic Chemistry: IUPAC Recommendations 2005. With R. M. Hartshorn and A. T. Hutton. Cambridge: RSC Publishing. ISBN 978-0-85404-438-2.Hammond, C. R. (2009). "Section 4; The Elements". In David R. Lide (ed.). CRC Handbook of Chemistry and Physics, 89th ed. Boca Raton, FL: CRC Press/Taylor and Francis.Jébrak, Michel; Marcoux, Eric; Laithier, Michelle; Skipwith, Patrick (2014). Geology of mineral resources(2nd ed.). St. John's, NL: Geological Association of Canada. ISBN 9781897095737.12 giu 2024 · Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] through lutetium [Lu]).
2 mag 2019 · Gli elementi che cadono tra i due estremi sono gli elementi delle terre rare medie (MREE). Un sistema popolare classifica i numeri atomici fino a 61 come LREE e quelli superiori a 62 come HREE (con la gamma media assente o fino all'interpretazione).
2 mag 2023 · According to the USGS, “The rare earths are a relatively abundant group of 17 elements composed of scandium, yttrium, and the lanthanides. (Try naming all 17 before looking at the chart below.)
Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). The group consists of yttrium and the 15 lanthanide elements (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium).
Secondo la definizione della IUPAC, le terre rare (in inglese rare-earth elements o rare-earth metals) sono un gruppo di 17 elementi chimici della tavola periodica, precisamente scandio, ittrio e i lantanoidi.
