Europium (Eu)

We are a leading manufacturer and supplier of research materials

Europium 63Eu151.965

Discovered in 1901 by E.-A. Demarcay at Paris, France.

[Named after Europe]

French: europium
German: Europium
Italian: europio
Spanish: europio

Description: Europium is a soft, silvery metal which is one of the rarest of the so-called rare earth group (more correctly termed the lanthanides). It is the most reactive of these metals, reacting quickly with oxygen and water. It is little used, but some employed in thin-film superconductor alloys.


Further Materials properties


Crystal structure:

(cell dimensions/pm), space group, 
b.c.c. (a=458.20), Im3m

X-ray diffractions mass absorption coefficients: CuKa 425 (µ/r) / cm2g-1
MoKa 61.5 (µ/r) / cm2g-1
Neutron scattering length: 0.722 b/10-12 cm
Thermal neutron capture cross-section: 4600 sa / barns
Density: 5243 kg/m-3 [293 K]
Melting point: 821,85°C / 1095°K
Boiling point: 1596,85°C / 1870°K
Molar volume: 28.98 cm3
Thermal conductivity: 13.9 [300 K] W m-1K-1
Coefficient of linear thermal expansion: 32 x 10-6 K-1
Electrical resistivity: 990.0 x 10-8 [298 K] Ωm
Mass magnetic susceptibility: +2.81 x 10-6(s) kg-1m3
Young's modulus: 18.2 GPa
Rigidity modulus: 7.9 GPa
Bulk modulus: 8.3 GPa
Poisson's ratio: 0.152 GPa
Radi: Eu3+ 98;Eu2+ 112; atomic 204; covalent 185
Electronegativity: n.a. (Pauling); 1.01 (Allred); ≤3.1 eV (absolute)
Effective nuclear charge: 2.85 (Slater); 8.11 (Clementi); 11.17 (Froese-Fischer)
Number of Isotopes (incl. nuclear isomers): 26
Isotope mass range: 141 -> 160



Biological data


Biological role: None.
Toxic intake: n.a.
Lethal intake: LD50 (nitrate, oral, mouse) > 5000 mg Kg-1
Hazards: Europium is mildly toxic by ingestion. 
Level in humans  n.a. but very low
Blood: n.a.
Bone: n.a.
Liver: n.a.
Muscle: n.a.
Daily dietary intake: n.a.
Total mass of element in average
[70 kg] person:
n.a. but very low


Geological data


MineralFormulaDensityHardnessCrystal apperance
Bastnäsite-Ce*  (Ce, La, etc.) CO3F  4.9  4 - 4.5  hex., vit/ greasy yellow
Monazite-Ce*  (Ce, La, Nd, Th, etc.)PO4  5.20  5 - 5.5  mon., waxy/ vit. yellow-brown

* Although not a major constituent, europium is present in extractable amounts.

Chief ores: monazite, bastnäsite
World production: c. 400 tonnes/year
Main mining areas: USA, Brazil, India, Sri Lanka, Australia, China
Reserves: c. 1.5 x 106 tonnes
Specimen: available as ingots. Safer.


Sun: 5 (relative to H = 1 x 1012)
Earth's crust: 2.1 ppm
Altantic surface: 0.9 x 10-7 ppm
Atlantic deep: 1.5 x 10-7 ppm
Pacific surface: 1.0 x 10-7 ppm
Pacific deep: 2.7 x 10-7 ppm
Residence time: 500 years
Classification: recycled
Oxidation state: III

  Source: Emsley, J. (1998) The Elements (3rd Edition)

Other sizes and specifications on request

Overview of elements with access to our shop

1 18
2 13 14 15 16 17
Li Be B C
Na Mg 3 4 5 6 7 8 9 10 11 12 Al Si P S
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se
Rb Sr Y Zr Nb Mo
Ru Rh Pd Ag Cd In Sn Sb Te I
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi
Ce Pr Nd
Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Get our latest news and special sales
You may unsubscribe at any moment. For that purpose, please find our contact info in the legal notice.
Tel.: +49 (0) 2461 - 9352 - 0
Fax: +49 (0) 2461 - 9352 - 11