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Europium (revised)

EUROPIUM (REVISED)

Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.

Overview

Europium was discovered in 1901 by French chemist Eugene-Anatole Demarcay (1852-1904). Demarcay named the element after the continent of Europe. It was one of the Last of the rare earth elements discovered.

The term rare earth elements has long been used for elements in Row 6 of the periodic table, a chart that shows how chemical elements are related to each other. A better name for these elements is lanthanides. This name comes from the first element in Row 6, lanthanum. Rare earth elements are not especially rare, but were originally very difficult to separate from one another.

Europium is the most active of the lanthanides. It is more likely to react with other elements than the other rare earth elements.

Europium is quite expensive to produce, so it has few practical uses. It is used in television tubes and lasers.

SYMBOL
Eu

ATOMIC NUMBER
63

ATOMIC MASS
151.96

FAMILY
Lanthanide
rare earth metal)

PRONUNCIATION
yuh-RO-pea-um

Discovery and naming

In 1901, Demarcay was studying samarium, a new element that had been discovered over twenty years earlier. In his studies, Demarcay made an interesting discovery. The new element was not one, but two elements. Demarcay gave the original name of samarium to one, and the other he called europium, after the continent of Europe.

More than a century earlier, a heavy new mineral had been found near the town of Bastnas, Sweden, and given the name cerite.

Chemists found that cerite was a complex material. One hundred years of research revealed seven new elements in cerite. Europium was the last of these new elements to be identified.

Physical properties

Europium has a bright, shiny surface. It is steel gray and has a melting point of 826°C (1,520°F) and a boiling point of about 1,489°C (2,712°F). The density is 5.24 grams per cubic centimeter.

Europium has a strong tendency to absorb neutrons, making it useful in nuclear power production. A nuclear power plant produces electricity from the energy released by nuclear fission. Slow-moving neutrons collide with uranium or Plutonium atoms, breaking them apart and releasing energy as heat. The amount of energy produced in a nuclear power plant is controlled by the number of neutrons present. Europium is used to absorb neutrons in this kind of control system.

Chemical properties

Europium is the most active of the lanthanides. It reacts quickly with water to give off hydrogen. It also reacts strongly with oxygen in the air, catching fire spontaneously. Scientists must use great care in handling the metal.

Occurrence in nature

Europium is not abundant in the Earth's surface. It is thought to occur at a concentration of no more than about one part per million. That makes it one of the least abundant of the rare earth elements. The study of light from the Sun and certain stars indicates that europium is present in these bodies as well.

The most common ores of europium are monazite, bastnasite, and gadolinite.

Isotopes

Two naturally occurring isotopes of europium exist, europium-151 and europium-153. Isotopes are two or more forms of an element. Isotopes differ from each other according to their mass number. The number written to the right of the element's name is the mass number. The mass number represents the number of protons plus neutrons in the nucleus of an atom of the element. The number of protons determines the element, but the number of neutrons in the atom of any one element can vary. Each variation is an isotope.

A number of radioactive isotopes of europium have also been prepared. A radioactive isotope is one that breaks apart and gives off some form of radiation. Radioactive isotopes are produced when very small particles are fired at atoms. These particles stick in the atoms and make them radioactive. None of the radioactive isotopes of europium has any commercial use.

Extraction

Europium is prepared by heating its oxide with lanthanum metal:

Europium metal is quite expensive to make and sells for about $3,000 to $4,500 a kilogram ($1,350 to $2,000 a pound).

Uses

There are no commercially important uses for europium metal.

Compounds

The most common use of europium compounds is in making phosphors. A phosphor is a material that shines when struck by electrons. The color of the phosphor depends on the elements from which it is made. Phosphors containing europium compounds give off red light. The red color on a television screen, for example, may be produced by phosphors containing europium oxide. Europium oxide is a compound made of europium metal and oxygen.

Europium reacts strongly with oxygen in the air, catching fire spontaneously.

Europium oxide phosphors are also used in printing postage stamps. These phosphors make it possible for machines to "read" a stamp and know what its value is. If the wrong stamp is on a letter, the machine can tell from reading the phosphor. The machine will then send the letter back to the person who mailed it.

Health effects

Except for its tendency to catch fire, little information is available on the health effects of europium. In general, it is regarded as toxic and must be handled with great caution.

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Europium

Europium


melting point: 1,099K
boiling point: 1,800K
density: 5,244/kg m 3
most common ions: Eu 3+, Eu 2+

Europium is a metallic element discovered in 1901 in Paris by the French scientist Eugène-Anatole Demarcay. It belongs to a series of elements called lanthanides , or 4f elements, extending from lanthanum (atomic number 57) to lutetium (atomic number 71). These elements have low abundances: Europium occurrence in Earth's crust is only 2.1 ppm (parts per million), that is, 2.1 grams (0.07 ounces) per metric ton, and in seawater, its concentration is as low as 4 × 108 ppm.

As a metal , europium is very reactive so that one usually finds it under its trivalent, triply oxidized form (Eu3+ ion) in oxides or salts. A divalent form (Eu2+) also displays some stability. Two minerals that contain many of the lanthanide elements, which are separated by liquid-liquid extraction, are commercially important: monazite (found in Australia, Brazil, India, Malaysia, and South Africa) and bastnasite (found in China and the United States).

A very interesting property of the europium ions is their bright red (Eu3+) and bright blue (Eu2+) luminescence. The red luminescence has been instrumental in identifying the element and it is of great practical use today. For instance, the red color seen on computer and television screens derives from red light emitted by a europium-containing phosphor (an inorganic compound with 47% Eu3+). The same type of material is used in energy-saving fluorescent lamps: Those displaying a warm light contain Eu3+. In medicine, antibodies (molecules generating an antibody response, e.g., certain hormones) labeled with a europium-containing compound react with specific antigens, forming antigen-antibody complexes, and the red luminescence helps to quantify these hormones in biological fluids (e.g., blood, urine).

see also Cerium; Dysprosium; Erbium; Gadolinium; Holmium; Lanthanides; Lanthanum; Lutetium; Neodymium; Praseodymium; Promethium; Samarium; Terbium; Thulium; Ytterbium.

Jean-Claude Bünzli

Bibliography

Kaltsoyannis, Nikolas, and Scott, Peter (1999). The f Elements. New York: Oxford University Press.

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europium

europium (yŏŏrō´pēəm) [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820°C; b.p. about 1,600°C; sp. gr. 5.25 at 25°C; valence +2 or +3. Europium is a ductile silvery-white metal; it is both rare and expensive. It is a member of Group 3 of the periodic table. Its oxides are found in minerals with the other rare earths. Europium has been identified in the sun and some stars by spectroscopy. Its physical properties are like those of the other members of the lanthanide series, but many of its chemical properties are more like those of calcium. The most reactive of the rare-earth metals, it tarnishes quickly in air at room temperature and ignites and burns above 150°C. It reacts readily with water. Twenty-one isotopes of europium are known, most of them unstable. Since it is a good neutron absorber, europium metal is used in nuclear reactor control rods. Europium oxide, a pinkish powder, is used to activate red phosphors in the manufacture of color television picture tubes. The discovery of europium is credited to Eugène Demarcay, who isolated fairly pure europium oxide in 1901.

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europium

europium (symbol Eu) Silvery-white metallic element of the lanthanide series. Its chief ores are monazite and bastnaesite. The metal is used in the manufacture of colour television screens, lasers, and in control rods in nuclear reactors. Properties: at.no. 63; r.a.m. 151.96; r.d. 5.25; m.p. 822°C (1512°F); b.p. 1597°C (2907°F); most common isotope Eu153 (52.18%).

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europium

eu·ro·pi·um / yəˈrōpēəm/ • n. the chemical element of atomic number 63, a soft silvery-white metal of the lanthanide series. Europium oxide is used with yttrium oxide as a red phosphor in color television screens. (Symbol: Eu)

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europium

europium •columbium •erbium, terbium, ytterbium •scandium • compendium •palladium, radium, stadium, vanadium •medium, tedium •cryptosporidium, cymbidium, idiom, iridium, rubidium •indium •exordium, Gordium, rutherfordium •odeum, odium, plasmodium, podium, sodium •allium, gallium, pallium, thallium, valium •berkelium, epithelium, helium, nobelium, Sealyham •beryllium, cilium, psyllium, trillium •linoleum, petroleum •thulium • cadmium •epithalamium, prothalamium •gelsemium, premium •chromium, encomium •holmium • fermium •biennium, millennium •cranium, geranium, germanium, Herculaneum, titanium, uranium •helenium, proscenium, rhenium, ruthenium, selenium •actinium, aluminium, condominium, delphinium •ammonium, euphonium, harmonium, pandemonium, pelargonium, plutonium, polonium, zirconium •neptunium •europium, opium •aquarium, armamentarium, barium, caldarium, cinerarium, columbarium, dolphinarium, frigidarium, herbarium, honorarium, planetarium, rosarium, sanitarium, solarium, sudarium, tepidarium, terrarium, vivarium •atrium •delirium, Miriam •equilibrium, Librium •yttrium •auditorium, ciborium, conservatorium, crematorium, emporium, moratorium, sanatorium, scriptorium, sudatorium, vomitorium •opprobrium •cerium, imperium, magisterium •curium, tellurium •potassium • axiom • calcium •francium • lawrencium • americium •Latium, solatium •lutetium, technetium •Byzantium • strontium • consortium •protium • promethium • lithium •alluvium, effluvium •requiem • colloquium • gymnasium •caesium (US cesium), magnesium, trapezium •Elysium • symposium

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