from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A silvery-white, soft, rare-earth element occurring in monazite and bastnaesite and used to dope lasers and to absorb neutrons in research. Atomic number 63; atomic weight 151.96; melting point 826°C; boiling point 1,439°C; specific gravity 5.259; valence 2, 3. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a metallic chemical element (symbol Eu) with an atomic number of 63.
from the GNU version of the Collaborative International Dictionary of English
- n. A metallic element of the rare-earth group (Lanthanide series), discovered spectroscopically by Demarcay in 1896. Symbol, Eu; atomic number 63; at. wt., 151.965 (C=12.011); valence = +2 or +3.
from The Century Dictionary and Cyclopedia
- n. A supposed new element announced by Demarçay in 1901, obtained in very small quantity as oxid, sulphate, etc., from samar-skite and monazite.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a bivalent and trivalent metallic element of the rare earth group
Now rare earth elements with exotic names such as europium and tantalum hold the key to hybrid cars, wind turbines and crystal-clear
Now rare earth elements with exotic names such as europium and tantalum hold the key to hybrid cars, wind turbines and crystal-clear TV displays - that is, if a looming supply shortage doesn't stop innovation in its tracks.
Rare-earth phosphors such as europium and yttrium are in demand to tweak the color of compact fluorescent light bulbs and LED displays.
The insides of energy-efficient compact fluorescent light bulbs are coated with tiny amounts of two such elements, terbium and europium.
The mine—perched 4,800 miles above sea level—had its heyday three decades ago, sometimes producing metals such as europium, which provided the red color for color television sets at the time.
Magnets made with neodymium power cellphones and wind turbines, cerium is used to polish flat-screen monitors, and europium puts the red in cockpit displays and televisions.
The drops haven't been across the board, and europium and ytterbium prices remain high, he said.
James S. Schilling, Ph. D., professor of physics in Arts & Sciences at Washington University in St. Louis, and Mathew Debessai — his doctoral student at the time — discovered that europium becomes superconducting at 1.8 K (-456 °F) and 80 GPa (790,000 atmospheres) of pressure, making it the 53rd known elemental superconductor and the 23rd at high pressure.
Everything from fluorescent light bulbs to laptop and iPhone screens relies on small but critical amounts of europium to generate a pleasant red color and terbium to make green.
In the 1960s, the pit grew deeper as demand increased for the rare-earth element europium, which was used to create the red tones in color TVs.