Encyclopedia of Geochemistry

Living Edition
| Editors: William M. White


  • Michael Bizimis
  • Howie Scher
Living reference work entry

Later version available View entry history

DOI: https://doi.org/10.1007/978-3-319-39193-9_136-1


Element Data

Atomic symbol: Sm

Atomic number: 62

Atomic weight: 150.363(8)

Isotopes and abundances:

Sm 3.08(1)

Sm 15.02(5)%

Sm 11.25(3)%

Sm 13.83(4)%

Sm 7.35(2)%

Sm 26.74(3)%

Sm 22.73(5)%

1 atm melting point: 1345 K

1 atm boiling point: 2067 K

Common valences: 3+

Ionic radii: 108 pm (eightfold coordination)

Pauling electronegativity: 1.17

First ionization potential: 5.6437 eV

Chondritic (CI) abundance: 0.148 ppm

Silicate Earth abundance: 0.406 ppm

Crustal abundance: 3.9 ppm

Seawater abundance: 0.1–20 pmol/kg

Core abundance: ~0

History and Use

Samarium was first discovered by Swiss chemist Marc Delafontaine in 1878 who named it “decipium,” later proven to be a mixture of samarium and other rare earths. French chemist Paul-Emile Lecoq de Boisbaudran isolated samarium in 1879. It was purified from the mineral samarskite named for Colonel Vasili von Samarsky, a Russian mine official (Holden, 2001). Commercial applications of Sm include samarium-cobalt magnets, which have a...


Carbon Capture Ridge Basalt Painful Bone Metastasis Chondrite Meteorite 146Sm 146Sm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Earth and Ocean SciencesUniversity of South CarolinaColumbiaUSA