from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A silvery or pale gray metallic rare-earth element found in monazite and bastnaesite and used as a dopant for laser materials, in infrared absorbing glass, and as a neutron absorber in certain nuclear reactors. Atomic number 62; atomic weight 150.36; melting point 1,072°C; boiling point 1,791°C; specific gravity (approximately) 7.50; valence 2, 3. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metallic chemical element (symbol Sm) with an atomic number of 62.
from the GNU version of the Collaborative International Dictionary of English
- n. A rare metallic element of doubtful identity.
from The Century Dictionary and Cyclopedia
- n. The name given by Lecoq de Bois-baudran to a metal which he supposed he had discovered in the mineral samarskite by the aid of the spectroscope. Nothing further is known of it, nor has its existence been, as yet, definitely established.
- n. This metal belongs to the cerium group. The oxid is white, the salts yellow, and characteristic absorption and spark spectra have been obtained. Like so many other members of the cerium and yttrium groups, samarium is of uncertain individual identity. There seems now but little doubt that in its oxid as originally described there is present at least one other element, the europium of Demarçay, Urbain, and Lacombe.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite
China controls up to 97% of world production of these elements — which include samarium, scandium and yttrium — and its export quotas for this year are nearly exhausted.
Fortunately a team from the University of Maryland has discovered a cleaner replacement for PZT, bismuth samarium ferrite (BSFO).
It sold neodymium and samarium, which form the basis of extraordinarily powerful magnets needed for precision-guided missile systems and the batteries used in hybrid or electric vehicles.
This resulted in geochemists realizing that the Earth, the Moon, and Mars all have lithic compositions that contain anywhere from five to eight percent more neodymium and samarium than the chondritic meteorites do.
A closer comparison and analysis of the two very similar elements samarium and neodymium followed, as their half-lives provide insight that allow geochemists to mentally reconstruct the formation of the solar system.
LEMON cerium germanium gold hafnium iodine iron lanthanum neodymium phosphorus praseodymium protactinium samarium scandium silver sulphur thorium titanium uranium vanadium yttrium zirconium
After receiving his M.S. he stayed on at Tsinghua University as a research assistant of Professor C.H. Wong and carried out the x-ray structure determination of tricyclopentadienyl samarium.
Rare earths with critical military applications include samarium, used for super-strong samarium-cobalt magnets that help steer guided missiles.
"These obscure minerals - 17 different elements with futuristic names such as neodymium, samarium, yttrium and lanthanum - are crucial for everything from guided missiles and hybrid cars to flat-screen televisions, iPods and BlackBerry phones."
Formerly known as Santoku America, Inc., the facility is one of the leading producers of high-purity rare earth alloys and metals outside of China, and manufactures neodymium-iron-boron (NdFeB) alloy and samarium cobalt (SmCo) alloy, as well as other specialty alloys and products.