Promethium

promethium Struktur
7440-12-2
CAS-Nr.
7440-12-2
Bezeichnung:
Promethium
Englisch Name:
promethium
Synonyma:
61Pm;Prometio;Chebi:33373;promethium-147;promethium atom;promethium ISO 9001:2015 REACH
CBNumber:
CB61261484
Summenformel:
Pm
Molgewicht:
144.9
MOL-Datei:
7440-12-2.mol

Promethium Eigenschaften

Schmelzpunkt:
1080° (Weigel)
Siedepunkt:
3000°C
Dichte
7.22
Aggregatzustand
silvery metal
Farbe
silvery metal; hexagonal, hexane
EPA chemische Informationen
Promethium (7440-12-2)

Sicherheit

RIDADR  2912
HazardClass  7

Promethium Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften

silvery metal; enthalpy of sublimation is 348kJ/mol (estimated); radius of atom is 0.1811nm; radius of ion is 0.0979 nm; Pr+++has yellow-colored solutions [KIR82]

Physikalische Eigenschaften

Silvery-white metal; density 7.22 g/cm3; because of radioactivity, the metal and its salts luminesce in the dark giving a pale blue or greenish glow; melts at 168+6°C; vaporizes at 2,460°C; insoluble in water.

History

The discovery of this element is credited to J.A. Marinsky and L.E. Glendenin who, in 1945, identified its long-lived isotope Pm-147 (t1/2 2.64 years) in the fission products of uranium. They named the element after Prometheus, who according to Greek mythology stole fire from heaven. The element was first isolated from fission product wastes by G.W. Parker and P.M. Lantz in 1948. It first was recovered from natural sources by O. Erametsa in 1965. An amount less than 0.5 g was recovered from 20 tons of rare earths.
Promethium does not occur in metallic form in nature. Minute quantities are associated with other rare earths. It also is detected in uranium fission products. It is probably the rarest of the lanthanide elements.
Promethium has very limited applications. It is used in phosphor lights to produce signals. Also, it is used as a beta particle source for thickness gages, nuclear batteries, and portable x-ray units.

Verwenden

Promethium-147 is used in the manufacture of luminescent paint for watch dials, as well as being a source of beta rays.

Vorbereitung Methode

Promethium-147, the isotope used commercially, is isolated from fission product wastes. The radioactive materials must be handled safely in a glove box. The metal complexes either with ethlenediaminetetraacetic acid (EDTA) or diethylenetriaminepentaacetic acid (DTPA) and is isolated by elution from Dowex 50.
The metal may be obtained from its fluoride salt, promethium(III) fluoride by heating with lithium metal in a double tantalum crucible at 700 to 800°C in vacuum and then increasing the temperature to 1,100°C.

Promethium Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Promethium Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global( 4)Lieferanten
Firmenname Telefon E-Mail Land Produktkatalog Edge Rate
Hubei Jusheng Technology Co.,Ltd.
18871490254
linda@hubeijusheng.com CHINA 28172 58
Shaanxi Dideu Medichem Co. Ltd
+86-029-89586680 +86-18192503167
1026@dideu.com China 7724 58
Nanjing Chemlin Chemical Co., Ltd 025-83697070
info@chemlin.com.cn China 19172 64

7440-12-2(Promethium)Verwandte Suche:


  • promethium-147
  • 61Pm
  • Chebi:33373
  • Prometio
  • promethium atom
  • promethium ISO 9001:2015 REACH
  • 7440-12-2
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