rare earth definition
What are rare earths, crucial elements in modern …
The rarest rare earth element, thulium. Jurii, CC BY. They are rare in one sense, though – mineralogists would call them "dispersed," meaning they're mostly sprinkled across the planet in ...
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blue green Intensifying screens permit a good radiograph to …
to provide comprise between speed and definition. There are three types of intensifying screens: a) Standard - slow screens b) Rare earth - fast screens c) Combination Standard screens use calcium tungstate phosphors, while rare earth screens use gadolinium or lanthanum phosphors. The commercial name for rare earth screens is Lanex.
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Rare earth element Definition & Meaning
The meaning of RARE EARTH ELEMENT is any of a series of metallic elements of which the oxides are classed as rare earths and which include the …
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Rare earths: Neither rare, nor earths
The problem is getting hold of the rare earths that make this possible. More than 85% of the world's supply of rare-earth metals comes from China. And practically 100% of the "heavy" rare earths ...
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Light Rare Earth Elements (LREE)
The light rare earth elements, light-group rare earths, or LREE are a subset of the lanthanide series of the rare earth elements, which are themselves a special set of transition metals. Like other metals, the light rare earths have a shiny metallic appearance. They tend to produce colored complexes in solution, conduct heat and electricity ...
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Rare Earth Elements
Overview. The rare earth elements (REEs) are comprised of the lanthanide elements plus scandium and yttrium, which have similar physical properties and are often found in the same ores and deposits. Specifically, REEs include the light REEs (LREEs) such as lanthanum, cerium, praseodymium, neodymium, samarium, europium, and the heavy …
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Rare Earth Element
The REE is generally subdivided into light rare earth elements (LREE) and heavy rare earth elements (HREE), although their definition might differ from author to author. IUPAC (2005) states that LREE is the lanthanides that have unpaired electrons ranging from 0 to 7 in the 4f orbital (from La to Gd), whereas the HREE have paired electrons in ...
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What is the exact definition for Rare Earth Metal and …
The Rare Earth Elements (REE), also simply called Rare Earths (RE) or Rare. Earth Metals (REM), are a group of 17 elements—according to the International Union of Pure and Applied Chemistry ...
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Earth definition in American English | Collins English Dictionary
this planet as the habitation of humans, often in contrast to heaven and hell. to create a hell on earth. 4. the surface of this planet. to fall to earth. 5. the solid matter of this planet; dry land; ground. 6. soil and dirt, as distinguished from rock and sand; the softer part of …
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Scientists Say: Rare earth element
Rare earth element (noun, "RAIR UHRTH ELL-eh-ment") A rare earth element is one of 17 elements on the periodic table. These 17 metals include 15 "lanthanides." Those are elements 57 to 71. Scandium (element 21) and yttrium (element 39) are also rare earths. Rare earth elements are not really that rare. They're found around …
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RARE EARTH | English meaning
rare earth definition: one of a group of metal chemical elements that are difficult to find in large quantities, and are…. Learn more.
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Rare Earth Elements | SpringerLink
Rare earth elements are also quite insoluble and therefore relatively immobile during low-grade metamorphism, weathering, and hydrothermal alteration. This is a very important feature giving insight into the origin of igneous rocks and sedimentary rocks through the low-temperature processes that commonly affected the Archean crust.
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Rare Earth Elements (Metals)
The rare earth elements (REEs) or rare earth metals (REMs) are a group of metals found within the same ores and possessing similar chemical properties. Scientists and engineers disagree on exactly which element should be included in a list of the rare earths, but they generally include the fifteen lanthanide elements, plus scandium and …
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What Are Rare Earth Minerals, Why Do EVs Need Them, and …
Rare earth elements are also incandescent, meaning they emit light when exposed to heat, which was beneficial in the manufacture of lamps in the late 19th century. They also oxidize when exposed to air, although the lighter rare earth elements oxidize faster than the heavier ones. ... Rare earth ores are often laced with radioactive thorium …
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What are rare earth elements? | Earth | EarthSky
They're much more abundant in the Earth's crust than many other valuable elements. Even the rarest rare earth, thulium, with atomic number 69, is 125 times more common than gold. And the least ...
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A Look at Rare Earth Metals and Their Applications
In order of increasing atomic mass, the 17 rare earth metals and some of their common applications are given below. Scandium: Atomic weight 21. Used to strengthen aluminum alloys. Yttrium: Atomic weight 39. Used in superconductors and exotic light sources. Lanthanum: Atomic weight 57. Used in specialty glasses and optics, …
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Rare Earths
Rare Earths. The rare earths, or rare earth elements (REE), are a relatively abundant group of elements consisting of scandium, yttrium, and the 15 elements of the lanthanide series of the periodic table. Scandium (Sc) is the lightest rare earth element. Scandium is present in crustal rocks in amounts greater than lead and precious metals, but ...
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What are rare earth elements, and why are they …
A precise definition of rare earth elements (REEs) and in-depth discussion of how common REEs are, worldwide REE production, and current REE …
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Rare earth
Define rare earth. rare earth synonyms, rare earth pronunciation, rare earth translation, English dictionary definition of rare earth. n. 1. Any of various oxides of the rare-earth elements. 2. A rare-earth element. American Heritage® Dictionary of …
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Rare Earth Elements | Department of Energy
Rare earth elements (REEs), which comprise of only 17 elements from the entire periodic table, play a critical role to our national security, energy independence, …
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REE
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, …
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Rare earth elements facts
Rare earth elements facts. Rare earth elements (REE) are a group of 15 elements referred to as the lanthanide series in the periodic table of elements together with scandium and yttrium. The last two elements exhibit similar properties to the lanthanides and are found in the same ore bodies. REEs are key components in many electronic devices ...
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Rare Earth Elements: A Review of Production, Processing
As the definition implies, the potential environmental impacts from all stages of a mine must be considered in evaluating the feasibility of the mine start-up—including the costs of mine restoration—to determine if a REE deposit represents an ore from which REOs and then REMs can be recovered economically. ... ----- Rare Earth Elements ...
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Rare earth metal Definition & Meaning
The meaning of RARE EARTH ELEMENT is any of a series of metallic elements of which the oxides are classed as rare earths and which include the elements of the lanthanide series and sometimes yttrium and scandium —called also rare earth metal.
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Rare Earth Extraction
Figure 12. Extraction process for extraction of heavy rare earth oxides [ 6 ]. Ion exchange is a process in which ions in a solution are exchanged with a solid resin with an ionic charge. When the rare earth containing solution is passed over a …
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Rare Earth Definition & Meaning | YourDictionary
Rare Earth definition: Any of various oxides of the rare-earth elements.
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Rare-Earth Elements
Rare-Earth Elements Chapter O of Critical Mineral Resources of the United States—Economic and Environmental Geology and Prospects for Future Supply U.S. Department of the Interior U.S. Geological Survey Professional Paper 1802–O. 1A 8A 2A 3B 4B 5B 6B 7B 8B 11B 12B 3A 4A 5A 6A 7A
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A Complete Guide to Rare Earth Magnets | Master …
A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. The two most common rare earth magnets are Neodymium (Nd …
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Rare-earth element
Rare-earth element - Minerals, Ores, Uses: The content of the individual rare-earth elements varies considerably from mineral to mineral and from deposit to deposit. The minerals and ores are generally classified as "light" or "heavy"; in the former group most of the elements present are the light-atomic-weight elements (i.e., lanthanum, cerium, …
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History and Future of Rare Earth Elements
The Discovery and Commercialization of the Rare Earth Elements. The term rare earth was coined when an unusual black rock was unearthed by a miner in Ytterby, Sweden, in 1788. The ore was called "rare" because it had never been seen before and "earth" because that was the 18th-century geological term for rocks that could be dissolved in ...
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