samarium
samarium
Symbol: Sm
Atomic number: 62
Atomic weight: 150.35
Soft silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, Sm-147 is the only radioisotope, and has a half-life of 2.5*10^11 years. Used for making special alloys needed in the production of nuclear reactors. Also used as a neutron absorber. Small quantities of samarium oxide is used in special optical glasses. The largest use of the element is its ferromagnetic alloy which produces permanent magnets that are five times stronger than magnets produced by any other material. Discovered by Francois Lecoq de Boisbaudran in 1879.

Elements of periodic system. 2013.

  • samarium — [ samarjɔm ] n. m. • 1879; métal découvert dans la samarskite (minerai), du nom du chimiste russe Samarski ♦ Chim. Métal (Sm; no at. 62; m. at. 150,4) du groupe des lanthanides. Le samarium est utilisé pour absorber les neutrons dans les… …   Encyclopédie Universelle

  • Samarium — Sa*ma ri*um, n. [NL., fr. E. samarskite.] (Chem.) A rare metallic element of doubtful identity. [1913 Webster] Note: Samarium was discovered, by means of spectrum analysis, in certain minerals (samarskite, cerite, etc.), in which it is associated …   The Collaborative International Dictionary of English

  • Samarĭum — Sm (Sa), chemisch einfacher Körper, findet sich im Orthit und Thorit, Atomgewicht 150,3, bildet ein weißes Oxyd Sm2O3, das unschmelzbar ist, beim Glühen in Wasserstoff oder Sauerstoff sich nicht verändert, in Säuren sich leicht löst und gelbe,… …   Meyers Großes Konversations-Lexikon

  • Samarium — Samarium, Sa, ein im Orthit und Monazit sich findendes, zu den Edelerden gehörendes chemisches Element. Bujard …   Lexikon der gesamten Technik

  • Samarium — Samarĭum, sehr seltenes, wenig untersuchtes chem. Element, im Samarskit gefunden …   Kleines Konversations-Lexikon

  • samarium — [sə mer′ē əm, səmar′ē əm] n. [ModL: so named (1879) by Boisbaudran (see GALLIUM) < Fr samarskite (see SAMARSKITE), in which it occurs + IUM] a chemical element, one of the rare earth elements: symbol, Sm; at. no., 62: see the periodic table of …   English World dictionary

  • Samarium — promethium ← samarium → europium ↑ Sm ↓ …   Wikipedia

  • Samarium — Eigenschaften …   Deutsch Wikipedia

  • Samarium — Pour les articles homonymes, voir Sm. Samarium Prométhium ← Samarium → …   Wikipédia en Français

  • samarium — /seuh mair ee euhm/, n. Chem. a rare earth metallic element discovered in samarskite. Symbol: Sm; at. wt.: 150.35; at. no.: 62; sp. gr.: 7.49. [1875 80; < NL; see SAMARSKITE, IUM] * * * ▪ chemical element  (Sm), chemical element, rare earth metal …   Universalium