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The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Compounds containing rare ...
Women's History Month was first celebrated in Australia in 2000, initiated by Helen Leonard, convenor of the National Women's Media Centre, working with the Women's Electoral Lobby. The organisation of annual Women's History Month celebrations is incorporated as part of the work of the Australian Women's History Forum .
Many rare-earth minerals include rare-earth elements which thus hold the same significant purpose of rare-earth minerals. [5] Earth's rare minerals have a wide range of purposes, including defense technologies and day-to-day uses. [6] This would be associated with alkaline magmas or with carbonatite intrusives.
They include technology-critical elements, rare-earth elements and strategic materials. Price movements of critical materials [ 2 ] Demand for key energy transition minerals in 2023 [ 3 ] History and background
2009-06-27 10:49 Materialscientist 640×416× (175375 bytes) {{Information |Description = These rare-earth oxides are used as tracers to determine which parts of a watershed are eroding.
View history; General What links here; Related changes; Upload file; ... Pages in category "Rare earth elements" The following 3 pages are in this category, out of 3 ...
The times needed for lanthanites to fully crystallize increase linearly with the ionic potential of the trivalent rare-earth ion (La 3+, Ce 3+, Pr 3+, Nd 3+) present in their structure. The differences in these ion sizes and ionic potential as well as differences in dehydration energy of the trivalent rare-earth ions control the lifetime of the ...
The two are both rare-earth fluorocarbonates, but parisite's formula of Ca(Ce, La, Nd) 2 (CO 3) 3 F 2 contains calcium (and a small amount of neodymium) and a different ratio of constituent ions. Parisite could be viewed as a formula unit of calcite (CaCO 3 ) added to two formula units of bastnäsite.