At A Glance: Eu
|Atomic Radius:||233 pm (Van der Waals)|
|Melting Point:||822 °C|
|Boiling Point:||1529 °C|
|Oxidation States:||3, 2|
|Sources: Bastnasite and monazite are the principal ores containing europium.Uses: Phosphors in LCD screens, compact fluorescent lightbulbs, lasers. |
Content provided by Los Alamos National Laboratory. Used with permission.
Europium’s emission of visible radiation provides the perfect red phosphors used in color televisions and computer screens around the globe. Europium is also seen in fluorescent lighting which cuts energy use by 75% compared to incandescent lighting.
Europium is also used by the medical field as the highly sensitive luminescence provided by Europium attached as a tag to complex biochemicals assists in live tracing of these materials during living tissue research.Europium-doped plastic has been used as a laser material. With the development of ion-exchange techniques and special processes, the cost of the metal has been greatly reduced in recent years.
Named after Europe. In 1890 Boisbaudran obtained basic fractions from samarium-gadolinium concentrates which had spark spectral lines not accounted for by samarium or gadolinium. These lines subsequently have been shown to belong to europium. The discovery of europium is generally credited to Demarcay, who separated the rare earth in reasonably pure form in 1901. The pure metal was not isolated until recent years.
Europium is now prepared by mixing Eu2O3 with a 10%-excess of lanthanum metal and heating the mixture in a tantalum crucible under high vacuum. The element is collected as a silvery-white metallic deposit on the walls of the crucible.
As with other rare-earth metals, except for lanthanum, europium ignites in air at about 150 to 180°C. Europium is about as hard as lead and is quite ductile. It is the most reactive of the rare-earth metals, quickly oxidizing in air. It resembles calcium in its reaction with water. Bastnasite and monazite are the principal ores containing europium.SourcesEuropium has been identified spectroscopically in the sun and certain stars. Seventeen isotopes are now recognized. Europium isotopes are good neutron absorbers and are being studied for use in nuclear control applications.
Sources: Los Alamos National Laboratory; Molycorp