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Sm - Samarium

Samarium

 Samarium 
Sm
Atomic Number: 62
Atomic Weight: 150.36
Element Type: Rare Earth Metal
Crystal Structure: Rhombohedral
Melting Point: 1074.0°C = 1965.2°F = 1347.15 K
Boiling Point: °C = °F = K
Critical Temp: °C = °F = K
Atomic Radius: 2.59 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 1.62 Å
Electronegativity: 1.17

History

(Samarskite, a mineral) Discovered spectroscopically by its sharp absorption lines in1879 by Lecoq de Boisbaudran in the mineral samarskite, named in honor of a Russian mineofficial, Col Samarski.


Sources

Samarium is found along with other members of the rare-earth elements in many minerals,including monazite and bastnasite, which are commercial sources. It occurs in monazite tothe extent of 2.8%. While misch metal containing about 1% of samarium metal, has long beenused, samarium has not been isolated in relatively pure form until recent years.Ion-exchange and solvent extraction techniques have recently simplified separation of therare earths from one another; more recently, electrochemical deposition, using anelectrolytic solution of lithium citrate and a mercury electrode, is said to be a simple,fast, and highly specific way to separate the rare earths. Samarium metal can be producedby reducing the oxide with lanthanum.



Science Quote

'Natural science does not simply describe and explain nature, it is part of the interplay between nature and ourselves.'

Werner Heisenberg
(1901-1976)


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