Metals, Rare Earth
A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition, they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust.
Year introduced: 1976
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Subheadings:
Tree Number(s): D01.268.558, D01.552.550
MeSH Unique ID: D008674
Entry Terms:
- Earth Metals, Rare
- Rare Earth Metal
- Earth Metal, Rare
- Metal, Rare Earth
- Rare Earth Metals
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