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Topic: Samarium


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In the News (Tue 7 Oct 08)

  
  Samarium - Wikipedia, the free encyclopedia
Samarium is a rare earth metal, with a bright silver luster, that is reasonably stable in air; it ignites in air at 150°C.
Samarium oxide is a catalyst for the dehydration and dehydrogenation of ethanol.
Samarium is never found free in nature, but, like other rare earth elements, is contained in many minerals, including monazite, bastnasite and samarskite; monazite (in which it occurs up to an extent of 2.8%) and bastnasite are also used as commercial sources.
en.wikipedia.org /wiki/Samarium   (524 words)

  
 Samarium - Wikipedia
Samarium is een scheikundig element met symbool Sm en atoomnummer 62.
Samarium is in 1853 ontdekt door de Zwitserse chemicus Jean Charles Galissard toen hij scherpe absorptiebanden aantrof bij het bekijken van het element dat toen bekend was als didymium met een spectrofotometer.
Samarium is een helder glanzend metaal dat bij standaard temperatuur en druk niet wordt aangetast door zuurstof.
nl.wikipedia.org /wiki/Samarium   (297 words)

  
 NationMaster.com - Encyclopedia: Samarium   (Site not responding. Last check: 2007-11-07)
Samarium is a rare earth metal, with a bright silver lustre, that is reasonably stable in air; it ignites in air at 150°C. Three crystal modifications of the metal also exist, with transformations at 734 and 922°C, respectively.
Samarium is found along with other members of the rare-earth elements in many minerals, including monazite and bastnasite, which are commercial sources.
Samarium is used to dope calcium fluoride crystal for use in optical lasers or lasers.
www.nationmaster.com /encyclopedia/Samarium   (2470 words)

  
 Samarium   (Site not responding. Last check: 2007-11-07)
Samarium is a rare earth metal, with a bright silver lustre, that is reasonably stable in air; it ignites in air at 150°C.Three crystal modifications of the metal also exist, with transformations at 734 and 922°C, respectively.
Samarium oxide is catalytic for the dehydration and dehydrogenation of ethanol.
Samarium is never found free in nature, but, like other rare earth elements, is contained in many minerals, including monazite, bastnasite and samarskite ; monazite (in which it occurs upto an extent of 2.8%) and bastnasite are also used as commercial sources.
www.therfcc.org /samarium-41960.html   (477 words)

  
 MedlinePlus Drug Information: Samarium Sm 153 Lexidronam (Therapeutic)   (Site not responding. Last check: 2007-11-07)
Samarium Sm 153 lexidronam (sa-MARE-ee-um lex-ID-roe-nam) is a radiopharmaceutical (ray-dee-oh-far-ma-SOO-ti-kal).
Samarium Sm 153 lexidronam is to be given only by or under the direct supervision of a doctor with specialized training in nuclear medicine or radiation oncology.
Samarium Sm 153 lexidronam is passed mainly in the urine.
www.nlm.nih.gov /medlineplus/druginfo/uspdi/203683.html   (1319 words)

  
 Samarium
Samarium je chemický prvek v periodické tabulce to má symbol Sm a atomové číslo 62.
Samarium má žádnou známou biologickou roli, ale je řekl, aby stimuloval metabolismus.
Samarium je nikdy najit volný v přírodě, ale, jako jiné elementy vzácné zeminy, je obsažený v mnoha nerostech, včetně monazite, bastnasite a samarskite; monazite (ve kterém to nastane nahoru do rozsahu 2.8%) a bastnasite jsou také používány jako komerční zdroje.
wikipedia.infostar.cz /s/sa/samarium.html   (440 words)

  
 samarium. The Columbia Encyclopedia, Sixth Edition. 2001-05   (Site not responding. Last check: 2007-11-07)
Naturally occurring samarium is a mixture of seven isotopes, three of which are radioactive with extremely long half-lives.
Samarium is used as a catalyst in certain organic reactions.
Samarium was discovered in 1879 by P. Lecoq de Boisbaudran by spectroscopic analysis of the mineral samarskite.
www.bartleby.com /65/sa/samarium.html   (220 words)

  
 Samarium   (Site not responding. Last check: 2007-11-07)
Samarium, which is classified as a rare earth metal, is slivery and reactive.
Samarium is ranked fifth on the abundance chart for rare earth metals found in the earth's crust.
Samarium is used in the ceramic and electronic industries, as well as in luminescent and infrared absorbing glasses.
www.mvschools.org /ms/projects/html/brick/samarium.htm   (601 words)

  
 Samarium - Wikipedia
Metallisch glänzendes Samarium entzündet sich oberhalb von 150 °C. Mit Sauerstoff reagiert es zum Sesquioxid Sm Mit Wasser reagiert es heftig unter Bildung von Wasserstoff und Samariumhydroxid.
Samarium in Verbindung mit einem Bisphosphonat (Lexidronam) zur Behandlung von Knochenschmerzen bei Krebserkrankungen eingesetzt.
Verbindungen mit Samarium in der weniger günstigen Oxidationsstufe +2 (insbesondere Samarium(II)-iodid) finden Anwendung in der organischen Synthese (Reduktionsmittel und Ein-Elektronen-Transferreagenz)
de.wikipedia.org /wiki/Samarium   (466 words)

  
 Samarium (Sm)   (Site not responding. Last check: 2007-11-07)
Ranking 40th in order of abundance of the elements in the earth's crust, samarium is found in minerals such as cerite, gadolinite, monozite and bastnasite.
Samarium is used by the motion-picture industry for carbon-arc lighting.
Samarium oxide is used in the control rods of some nuclear reactors and in optical glass to absorb the infrared.
www.bayerus.com /msms/fun/pages/periodic/samarium   (114 words)

  
 Samarium   (Site not responding. Last check: 2007-11-07)
Samarium is in 1853 ontdekt door de Zwitserse chemicus Jean Charles Galissard toen hij absorptiebanden aantrof bij het bekijken van het dat toen bekend was als didymium met een spectrofotometer.
De naam samarium is afkomstig van het samarskiet waarin samarium meestal wordt aangetroffen.
Samarium is een helder glanzend metaal dat standaard temperatuur en druk niet wordt aangetast zuurstof.
nl.freeglossary.com /Sm   (311 words)

  
 Samarium   (Site not responding. Last check: 2007-11-07)
Samarium, Sm, is a metallic element, which is found in the lanthanide series of inner transition metals in Group IIIa of the periodic table.
Samarium is a bright lustrous metal, which is stable in air.
Samarium, Sm, is used in optics to absorb IR radiation.
www.ucc.ie /ucc/depts/chem/dolchem/html/elem/elem062.html   (65 words)

  
 Samarium
Samarium behoort tot de zeldzame chemicalien en kan gevonden worden in huishoudelijke apparatuur, zoals kleurentelevisies, fluorescerende lampen, spaarlampen en glas.
Samarium is vooral gevaarlijk in de werkomgeving, omdat de dampen en gassen met de lucht ingeademd kunnen worden.
Samarium accumuleert geleidelijk in bodems en waterbodems en dit leidt uiteindelijk tot een toegenomen concentratie in mensen, dieren en bodemdeeltjes.
www.lenntech.com /elementen-periodiek-systeem/Sm.htm   (203 words)

  
 Rare-Earth Magnets - Samarium Properties
Ion-exchange and solvent extraction techniques have recently simplified separation of the rare earths from one another; more recently, electrochemical deposition, using an electrolytic solution of lithium citrate and a mercury electrode, is said to be a simple, fast, and highly specific way to separate the rare earths.
Natural samarium is a mixture of several isotopes, three of which are unstable with long half-lives.
Samarium oxide has been used in optical glass to absorb the infrared.
www.rareearth.org /samarium_properties.htm   (347 words)

  
 CANCER   (Site not responding. Last check: 2007-11-07)
Samarium has a half-life of 48 hours --- during that time isolation of the dog and supervision by qualified stuff is necessary.
Samarium has been used to treat bone cancer in woman with breast cancer and in men with prostate cancer, when the cancer goes off into the bone.
Samarium wird intravenös injiziert, was schmerzlos und rasch wirksam ist.
www.leonberger.coolfreepage.com /health/cancer.htm   (793 words)

  
 Samarium (Element)   (Site not responding. Last check: 2007-11-07)
Samarium metal can produced by reducing the oxide with barium or lanthanum.
Samarium has a bright silver luster and is reasonably stable is air.
The metal ignites in air at about 150°C. Samarium is used to dope calcium fluoride crystals for use in optical masers or lasers.
www.tamuk.edu /chemistry/WebElements/samarium_element.htm   (139 words)

  
 Samarium (Sm) - Chemical properties, Health and Environmental effects
Samarium is a silvery-white metal belonging to the lanthanide group of the periodic table.
Samarium is used as a catalyst in certain organic reactions: the samarium iodide (SmI
Samarium is the fifth most abundant of the rare elements and is almost four times as common as tin.
www.lenntech.com /Periodic-chart-elements/Sm-en.htm   (287 words)

  
 Samarium - Wikipédia
Le samarium est un élément chimique, de symbole Sm et de numéro atomique 62.
Le samarium a été découvert par spectroscopie en 1853 par le chimiste suisse Jean Charles Galissard de Marignac, par l'observation de ses fines raies d'absorption dans le didymium.
Le samarium n'a pas de rôle connu, mais il est dit qu'il simulerait le métabolisme.
fr.wikipedia.org /wiki/Samarium   (271 words)

  
 Samarium
Samarium was discovered spectroscopically by its sharp absorption lines in 1879 by Lecoq de Boisbaudran in the mineral samarskite, named in honor of a Russian mine official, Col. Samarski.
Samarium is found along with other members of the rare-earth elements in many minerals, including nionazite and bastnasite, which are commercial sources.
Samarium, along with other rare earths, is used for carbon-arc lighting for the motion-picture industry.
pte.8k.com /EL062.html   (377 words)

  
 MichibataH82
Since rare earth elements like samarium exist naturally in extremely small quantities and samarium has a large cross section to thermal neutrons, fish labeled with a small dosage of the element can be analyzed at a later time employing activation analysis.
The turnover of samarium injected in the fish was quite slow, and samarium could be clearly detected as 2 years after the last injection.
Changes in the samarium concentration in several organs and tissues of labeled goldfish (expressed as ng Sm/mg of dry weight) after they were fed a labeled diet.
www.bio.nagoya-u.ac.jp:8000 /MichibataH82.html   (597 words)

  
 [No title]   (Site not responding. Last check: 2007-11-07)
Samarium cobalt magnets are highly resistant to oxidation, with higher magnetic strength and temperature resistance than alnico or ceramic materials.
Sintered samarium cobalt magnets are brittle and prone to chipping and cracking and may fracture when subjected to thermal shock.
This type of magnet is expensive, due to both the cost of raw materials and licensing of the patents involved.
www.worldhistory.com /wiki/S/Samarium.htm   (303 words)

  
 It's Elemental - The Element Samarium
Samarium was observed spectroscopically by Jean Charles Galissard de Marignac, a Swiss chemist, in a material known as dydimia in 1853.
Samarium is one of the rare earth elements used to make carbon arc lights which are used in the motion picture industry for studio lighting and projector lights.
Samarium oxide (Sm) is added to glass to absorb infrared radiation and acts as a catalyst for the dehydration and dehydrogenation of ethanol (C
education.jlab.org /itselemental/ele062.html   (163 words)

  
 Samarium (low valent)
Samarium, which is most stable in the third oxidation state (also like all other lanthanides), is used in the second oxidation state as an one-electron reducing agent.
The fact that samarium compounds are very mild reducing agents were demonstrated impressively by the mentioned examples.
Samarium diiodide promotes a photoinduced metalation of nonactivated C-Cl bonds of O-acetyl chlorohydrins and a β-elimination which affords alkenes with total or high stereoselectivity.
www.organic-chemistry.org /chemicals/reductions/samariumlowvalent.shtm   (623 words)

  
 The Good Samarium   (Site not responding. Last check: 2007-11-07)
Physically, samarium is a metallic element with a bright silver luster, a solid at standard temperature and pressure.
Samarium is a lanthanoid and the hardest member of the cerium group of rare earth metals.
Samarium's primary use is in samarium cobalt alloy magnets, which are particularly powerful; these are used in consumer applications such as headphones as well as in industrial contexts.
www.chemistry.pomona.edu /Chemistry/periodic_table/Elements/Samarium/samarium.htm   (243 words)

  
 Michael Swanwick's Periodic Table of Science Fiction
The first Samarium was built by King Omri in 880 B.C.E. as the capital of the northern kingdom of Israel.
It fell to Sargon in 721 B.C.E. The native population was deported, and it became the capital of an Assyrian province.
During the French occupation the Samarium was a Latin bishopric.
www.scifi.com /scifiction/elements/samarium.html   (264 words)

  
 Samarium Reference for Wavelength in the Visible and UV   (Site not responding. Last check: 2007-11-07)
Samarium perchlorate is a particularly good reference for establishing wavelength calibration because it has useful peaks from 230 to 560nm, many having a spectral bandwidth of less than 5nm.
Samarium is also an excellent material for checking wavelength in the UV as it has many peaks in the UV.
Samarium presents a wide range of crisply resolvable peaks which are easily used to correlate the wavelength indicator on your spectrophotometer to the known Samarium peaks.
www.starna.com /d_ref/d_wl/SL.html   (397 words)

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