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Sällsynta jordmetaller
Hierarki: | ∟ ∟ ∟ Sällsynta jordmetaller 19 sidobegrepp3 underordnad begrepp∟ ∟ ∟ Sällsynta jordmetaller 19 sidobegrepp3 underordnad begreppX |
Bredare villkor: | |
Snävare villkor: | |
Anmärkning: | Metals (1966-1975)X |
Anmärkning: | 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.
X |
Annotation: | GEN: prefer specifics
X |
historyNote*: | 76; was NON MESH before 1976
X |
publicMeSHNote*: | 76
X |
activeMeSHYear*: | |
dateCreated*: | 1975-07-23X |
dateEstablished*: | 1976-01-01X |
dateRevised*: | 2005-07-29X |
recordAuthorizer*: | agsX |
recordMaintainer*: | agsX |
recordOriginator*: | RLSX |
Typ: | |
Samordna villkor: | |
URI: | |
Termer och motsvarande begrepp: | Harvinaiset maametallit (fi) XHarvinainen maametalli (fi, ersatt) Metals, Rare Earth (en) Rare Earth Metals (en, ersatt) |
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