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samariummore about samarium

samarium

 

  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Samarium  \Sa*ma"ri*um\,  n.  [NL.,  fr  E.  samarskite.]  (Chem.) 
  A  rare  metallic  element  of  doubtful  identity. 
 
  Note:  Samarium  was  discovered,  by  means  of  spectrum  analysis, 
  in  certain  minerals  (samarskite,  cerite,  etc.),  in 
  which  it  is  associated  with  other  elements  of  the 
  earthy  group  It  has  been  confounded  with  the  doubtful 
  elements  decipium,  philippium,  etc.,  and  is  possibly  a 
  complex  mixture  of  elements  not  as  yet  clearly 
  identified.  Symbol  Sm  Provisional  atomic  weight  150.2. 
 
  From  WordNet  r  1.6  [wn]: 
 
  samarium 
  n  :  a  gray  lustrous  metallic  element  of  the  rare  earth  group  is 
  used  in  special  alloys;  occurs  in  monazite  and  bastnasite 
  [syn:  {Sm},  {atomic  number  62}] 
 
  From  Elements  database  20001107  [elements]: 
 
  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.




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