# Europium

-

Eu

Am
 Periodic Table - Extended Periodic Table
General
Name, Symbol, Number europium, Eu, 63
Chemical series lanthanides
Group, Period, Block n/a, 6, f
Appearance silvery white
Standard atomic weight 151.964 (1)  g·mol−1
Electron configuration [Xe] 4f7 6s2
Electrons per shell 2, 8, 18, 25, 8, 2
Physical properties
Phase solid
Density (near r.t.) 5.264  g·cm−3
Liquid density at m.p. 5.13  g·cm−3
Melting point 1099  K
(826 ° C, 1519 ° F)
Boiling point 1802  K
(1529 ° C, 2784 ° F)
Heat of fusion 9.21   kJ·mol−1
Heat of vaporization 176   kJ·mol−1
Specific heat capacity (25 °C) 27.66  J·mol−1·K−1
 P(Pa) 1 10 100 1 k 10 k 100 k at T(K) 863 957 1072 1234 1452 1796
Atomic properties
Crystal structure simple cubic (body centered)
Oxidation states 3,2
(mildly basic oxide)
Electronegativity  ? 1.2 (Pauling scale)
Ionization energies
( more)
1st:  547.1   kJ·mol−1
2nd:  1085  kJ·mol−1
3rd:  2404  kJ·mol−1
Atomic radius 185   pm
Atomic radius (calc.) 231  pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity ( r.t.) (poly) 0.900 µΩ·m
Thermal conductivity (300 K) est. 13.9  W·m−1·K−1
Thermal expansion ( r.t.) (poly)
35.0 µm/(m·K)
Young's modulus 18.2  GPa
Shear modulus 7.9  GPa
Bulk modulus 8.3  GPa
Poisson ratio 0.152
Vickers hardness 167  MPa
CAS registry number 7440-53-1
Selected isotopes
Main article: Isotopes of europium
iso NA half-life DM DE ( MeV) DP
150Eu syn 36.9 y ε 2.261 150Sm
151Eu 47.8% 5×1018 y α   147Pm
152Eu syn 13.516 y ε 1.874 152Sm
β- 1.819 152Gd
153Eu 52.2% 153Eu is stable with 90 neutrons
References

Europium (pronounced /jʊˈroʊpiəm/) is a chemical element with the symbol Eu and atomic number 63. It was named after the continent Europe.

## Notable characteristics

Europium is the most reactive of the rare earth elements; it rapidly oxidizes in air, and resembles calcium in its reaction with water; deliveries of the metal element in solid form, even when coated with a protective layer of mineral oil, are rarely shiny. Europium ignites in air at about 150 °C to 180 °C. It is about as hard as lead and quite ductile.

## Applications

There are few commercial applications for europium metal, although it has been used to dope some types of glass to make lasers, as well as for screening for Down syndrome and some other genetic diseases. Due to its ability to absorb neutrons, it is also being studied for use in nuclear reactors. Europium oxide (Eu2O3) is widely used as a red phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based phosphors. Whereas trivalent europium gives red phosphors, divalent europium gives blue phosphors. The two europium phosphor classes, combined with the yellow/green terbium phosphors, give the "trichromatic" lights that are becoming so important to provide economical lighting. It is also being used as an agent for the manufacture of fluorescent glass. Europium fluorescence is used to interrogate biomolecular interactions in drug-discovery screens. It is also used in the anti-counterfeiting phosphors in Euro banknotes.

Europium is commonly included in trace element studies in geochemistry and petrology to understand the processes that form igneous rocks (rocks that cooled from magma or lava). The nature of the europium anomaly found is used to help reconstruct the relationships within a suite of igneous rocks.

## Occurrence

Europium is never found in nature as a free element; however, there are many minerals containing europium, with the most important sources being bastnäsite and monazite. Europium has also been identified in the spectra of the sun and certain stars. Depletion or enrichment of europium in minerals relative to other rare earth elements is known as the europium anomaly.

Divalent europium in small amounts happens to be the activator of the bright blue fluorescence of some samples of the mineral fluorite (calcium difluoride). The most outstanding examples of this originated around Weardale, and adjacent parts of northern England, and indeed it was this fluorite that gave its name to the phenomenon of fluorescence, although it was not until much later that europium was discovered or determined to be the cause.

## Compounds

Europium compounds include:

• Fluorides: EuF2 EuF3
• Chlorides: EuCl2 EuCl3
• Bromides: EuBr2 EuBr3
• Iodides: EuI2 EuI3
• Oxides: EuO Eu2O3 Eu3O4
• Sulfides: EuS
• Selenides: EuSe
• Tellurides: EuTe
• Nitrides: EuN

Europium(II) compounds tend to predominate, in contrast to most lanthanides: (which generally form compounds with an oxidation state of +3). Europium(II) chemistry is very similar to barium(II) chemistry, as they have similar ionic radii. Divalent europium is a mild reducing agent, such that under atmospheric conditions, it is the trivalent form that predominates. Under anaerobic, and particularly under geothermal conditions, the divalent form is sufficiently stable such that it tends to be incorporated into minerals of calcium and the other alkaline earths. This is the cause of the "negative europium anomaly", that depletes europium from being incorporated into the most usual light lanthanide minerals such as monazite, relative to the chondritic abundance. Bastnaesite tends to show less of a negative europium anomaly than monazite does, and hence is the major source of europium today. The accessible divalency of europium has always made it one of the easiest lanthanides to extract and purify, even when present, as it usually is, in low concentration. See also europium compounds.

## Isotopes

Naturally occurring europium is composed of 2 isotopes, 151Eu and 153Eu, with 153Eu being the most abundant (52.2% natural abundance). While 153Eu is stable, 151Eu was recently found to be unstable to alpha decay with half-life of $5_{-3}^{+11}\times 10^{18}$ yr, in reasonable agreement with theoretical predictions. Besides natural radioisotope 151Eu, 35 artificial radioisotopes have been characterized, with the most stable being 150Eu with a half-life of 36.9 years, 152Eu with a half-life of 13.516 years, and 154Eu with a half-life of 8.593 years. All of the remaining radioactive isotopes have half-lives that are less than 4.7612 years, and the majority of these have half-lives that are less than 12.2 seconds. This element also has 8 meta states, with the most stable being 150mEu (t½ 12.8 hours), 152m1Eu (t½ 9.3116 hours) and 152m2Eu (t½ 96 minutes).

The primary decay mode before the most abundant stable isotope, 153Eu, is electron capture, and the primary mode after is beta minus decay. The primary decay products before 153Eu are isotopes of samarium (Sm) and the primary products after are isotopes of gadolinium (Gd).

## Europium in nuclear power

 Isotope Yield Barns 151Eu 152Eu 153Eu 154Eu 155Eu ~10 low 1580 >2.5 330 5900 12800 312 1340 3950
Medium-lived
fission products
Property: t½
Unit: ( a)
Yield
(%)
Q *
( KeV)
βγ
*
155Eu 4.76 .0803 252 βγ
85Kr 10.76 .2180 687 βγ
113mCd 14.1 .0008 316 β
90Sr 28.9 4.505 2826 β
137Cs 30.23 6.337 1176 βγ
121mSn 43.9 .00005 390 βγ
151Sm 90 .5314 77 β

Europium is produced by nuclear fission, but as it is near the top of the mass range for fission products, the fission product yields of europium isotopes are low.

Like other lanthanides, many isotopes, especially isotopes with odd mass numbers and neutron-poor isotopes like 152Eu, have high cross sections for neutron capture, often high enough to be neutron poisons.

151Eu is the beta decay product of Sm-151, but since this has a long decay half-life and short mean time to neutron absorption, most 151Sm instead winds up as 152Sm.

152Eu (half-life 13.516 years) and 154Eu (halflife 8.593 years) cannot be beta decay products because 152Sm and 154Sm are nonradioactive, but 154Eu is the only long-lived "shielded" nuclide, other than 134Cs, to have a fission yield of more than 2.5 parts per million fissions. A larger amount of 154Eu will be produced by neutron activation of a significant portion of the nonradioactive153Eu; however, much of this will be further converted to 155Eu.

155Eu (halflife 4.7612 years) has a fission yield of 330 ppm for U-235 and thermal neutrons. Most will be transmuted to nonradioactive and nonabsorptive Gadolinium-156 by the end of fuel burnup.

Overall, europium is overshadowed by Cs-137 and Sr-90 as a radiation hazard, and by samarium and others as a neutron poison.

## Precautions

The toxicity of europium compounds has not been fully investigated, but there are no clear indications that europium is highly toxic compared to other heavy metals. The metal dust presents a fire and explosion hazard. Europium has no known biological role.

## Isolation of Europium

Europium metal is available commercially so it is not normally necessary to make it in the laboratory, which is just as well as it is difficult to isolate as the pure metal. This is largely because of the way it is found in nature. The lanthanoids are found in nature in a number of minerals. The most important are xenotime, monazite, and bastnaesite. The first two are orthophosphate minerals LnPO4 (Ln denotes a mixture of all the lanthanoids except promethium which is vanishingly rare) and the third is a fluoride carbonate LnCO3F. Lanthanoids with even atomic numbers are more common. The most common lanthanoids in these minerals are, in order, cerium, lanthanum, neodymium, and praseodymium. Monazite also contains thorium and yttrium which makes handling difficult since thorium and its decomposition products are radioactive.

For many purposes it is not particularly necessary to separate the metals, but if separation into individual metals is required, the process is complex. Initially, the metals are extracted as salts from the ores by extraction with sulphuric acid (H2SO4), hydrochloric acid (HCl), and Sodium hydroxide">sodium hydroxide (NaOH). Modern purification techniques for these lanthanoid salt mixtures are ingenious and involve selective complexation techniques, solvent extractions, and ion exchange chromatography.

Pure europium is available through the electrolysis of a mixture of molten EuCl3 and NaCl (or CaCl2) in a graphite cell which acts as cathode using graphite as anode. The other product is chlorine gas.