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About Europium

Europium Bohr

In 1901, EugŔne-Anatole Demaršay was finally convinced that he was correct in his suspicion, which had begun five years of experiments earlier, that the samples of samarium and gadolinium he had acquired actually contained impurities of a previously undiscovered element. In a departure from the nationalistic trend, at the time, of naming newly discovered elements for countries--gallium, germanium, and polonium had each been discovered and named in the previous quarter-century--Demaršay named his discovery after the entire continent of Europe. Nearly a century later, when the Euro was established, phosphorescent europium compounds were fittingly chosen for use in anti-counterfeiting measures embedded in the notes of the new currency.

The main uses of europium are in light emitting compounds called phosphors, though they are found in many places in addition to Euro notes. The discovery of a europium-containing red phosphor revolutionized color television technology in the 1960ĺs. Prior to the introduction of europium phosphors, the phosphors used to provide the color red in color televisions were very weak, and to maintain color balance all the other colors had to be muted. The availability of brighter red phosphors meant brighter color televisions were suddenly possible.

Today, two different classes of europium oxide phosphors provide red and blue light, which can be used individually or in combination with a yellow-green phosphor to provide white light. Europium phosphors are used in televisions, fluorescent lighting, and some LEDs. Additionally, europium is used as a dopant in glasses used for lasers and other optoelectronic applications, and has some specialized research applications.

Europium is a rare earth element that can be found in varying quantities in most rare-earth containing minerals. It is most commonly extracted from monazite and bastnasite.

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High Purity (99.999%) Europium Oxide (Eu2O3) Powder Europium is utilized primarily for its unique luminescent behavior. Excitation of the europium atom by absorption of ultra violet radiation can result in specific energy level transitions within the atom creating an emission of visible radiation. In energy efficient fluorescent lighting, europium provides not only the necessary red, but also the blue. Several commercial blue phosphors are based on europium. Its luminesence is also High Purity (99.999%) Europium (Eu) Sputtering Target valuable in medical, surgical and biochemical applications. Europium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Europium oxide is available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Europium fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Europium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Europium Properties

Europium (Eu) atomic and molecular weight, atomic number and elemental symbolEuropium is a Block F, Group 3, Period 6 element. Europium Bohr ModelThe number of electrons in each of Europium's shells is 2, 8, 18, 25, 8, 2 and its electronic configuration is [Xe]4f7 6s2. The europium atom has an atomic radius of and its Van der Waals radius is 233 pm. In its elemental form, CAS Elemental Europium Picture7440-53-1, europium has a silvery-white appearance but it is rarely found without oxide discoloration. Europium is found in many minerals including bastnasite, monazite, xenotime and loparite. It is not found in nature as a free element. Europium was discovered by EugŔne-Anatole Demaršay in 1896, however, he did not isolate it until 1901. Europium was named after the continent of Europe.

Symbol: Eu
Atomic Number: 63
Atomic Weight: 151.97
Element Category: Lanthanide
Group, Period, Block: n/a, 6, f
Color: silvery-white
Other Names: Europio
Melting Point: 822 °C, 1511.6 °F, 1095.15 K
Boiling Point: 1529 °C, 2784.2 °F, 1802.15 K
Density: 5.244 kg·m3
Liquid Density @ Melting Point: 5.13 gĚcm3
Density @ 20°C: 5.248 g/cm3
Density of Solid: 5244 kg·m3
Specific Heat: 0.0421 Cal/g/K @ 25 ░C
Superconductivity Temperature: N/A
Triple Point: N/A
Critical Point: N/A
Heat of Fusion (kJ·mol-1): 10.5
Heat of Vaporization (kJ·mol-1): 176
Heat of Atomization (kJ·mol-1): 177.11
Thermal Conductivity: 0.139 W/cm/K @ 298.2 K
Thermal Expansion: (r.t.) (poly) 35.0 Ám/(mĚK)
Electrical Resistivity: 90.0 µΩ-cm @ 25░C
Tensile Strength: N/A
Molar Heat Capacity: 27.66 JĚmol-1ĚK-1
Young's Modulus: 18.2 GPa
Shear Modulus: 7.9 GPa
Bulk Modulus: 8.3 GPa
Poisson Ratio: 0.152
Mohs Hardness: N/A
Vickers Hardness: 167 MPa
Brinell Hardness: N/A
Speed of Sound: N/A
Pauling Electronegativity: N/A
Sanderson Electronegativity: 1.01
Allred Rochow Electronegativity: N/A
Mulliken-Jaffe Electronegativity: N/A
Allen Electronegativity: N/A
Pauling Electropositivity: N/A
Reflectivity (%): N/A
Refractive Index: N/A
Electrons: 63
Protons: 63
Neutrons: 89
Electron Configuration: [Xe] 4f76s2
Atomic Radius: 180 pm
Atomic Radius,
non-bonded (Å):
Covalent Radius: 198▒6 pm
Covalent Radius (Å): 1.83
Van der Waals Radius: 233 pm
Oxidation States: 3, 2, 1 (mildly basic oxide)
Phase: Solid
Crystal Structure: body-centered cubic
Magnetic Ordering: paramagnetic
Electron Affinity (kJ·mol-1) 83.334
1st Ionization Energy: 546.7 kJĚmol-1
2nd Ionization Energy: 1085 kJĚmol-1
3rd Ionization Energy: 2405 kJĚmol-1
CAS Number: 7440-53-1
EC Number: 231-161-7
MDL Number: MFCD00010992
Beilstein Number: N/A
SMILES Identifier: [Eu]
InChI Identifier: InChI=1S/Eu
PubChem CID: 23981
ChemSpider ID: 22417
Earth - Total: 79 ppb
Mercury - Total: 61 ppb 
Venus - Total: 83 ppb 
Earthá-áSeawater (Oceans), ppb by weight: 0.00013
Earthá-áSeawater (Oceans), ppb by atoms: 0.000005
Earthá-á Crust (Crustal Rocks), ppb by weight: 1800
Earthá-á Crust (Crustal Rocks), ppb by atoms: 240
Sun - Total, ppb by weight: 0.5
Sun - Total, ppb by atoms: 0.004
Stream, ppb by weight: 0.007
Stream, ppb by atoms: 0.00005
Meterorite (Carbonaceous), ppb by weight: 60
Meterorite (Carbonaceous), ppb by atoms: 8
Typical Human Body, ppb by weight: N/A
Typical Human Body, ppb by atom: N/A
Universe, ppb by weight: 0.5
Universe, ppb by atom: 0.004
Discovered By: EugŔne-Anatole Demaršay
Discovery Date: 1896
First Isolation: EugŔne-Anatole Demaršay (1901)

Health, Safety & Transportation Information for Europium

Europium is moderately toxic. Safety data for Europium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab. The below information applies to elemental (metallic) Europium.

Safety Data
Material Safety Data Sheet MSDS
Signal Word Danger
Hazard Statements H250
Hazard Codes F
Risk Codes 14/15-17
Safety Precautions 43-7/8
RTECS Number N/A
Transport Information UN 2813 4.3/PG 1
WGK Germany 3
Globally Harmonized System of
Classification and Labelling (GHS)

Europium Isotopes

Naturally occurring Europium has one stable isotope (153Eu) and one (151Eu) recently discovered to be unstable.

Nuclide Isotopic Mass Half-Life Mode of Decay Nuclear Spin Magnetic Moment Binding Energy (MeV) Natural Abundance
(% by atom)
130Eu 129.96357(54)# 1.1(5) ms [0.9(+5-3) ms] Unknown 2+# N/A 1016.81 -
131Eu 130.95775(43)# 17.8(19) ms Unknown 3/2+ N/A 1034.2 -
132Eu 131.95437(43)# 100# ms +áto 132Sm; páto 132Sm N/A N/A 1042.28 -
133Eu 132.94924(32)# 200# ms +áto 133Sm 11/2-# N/A 1059.68 -
134Eu 133.94651(21)# 0.5(2) s +áto 134Sm N/A N/A 1067.75 -
135Eu 134.94182(32)# 1.5(2) s +áto 135Sm; ▀+á+ páto 134Sm 11/2-# N/A 1075.83 -
136Eu 135.93960(21)# 3.3(3) s +áto 136Sm; ▀+á+ páto 135Sm (7+) N/A 1093.23 -
137Eu 136.93557(21)# 8.4(5) s +áto 137Sm 11/2-# N/A 1101.31 -
138Eu 137.93371(3) 12.1(6) s +áto 138Sm (6-) N/A 1109.39 -
139Eu 138.929792(14) 17.9(6) s +áto 139Sm (11/2)- N/A 1126.78 -
140Eu 139.92809(6) 1.51(2) s +áto 140Sm 1+ N/A 1134.86 -
141Eu 140.924931(14) 40.7(7) s +áto 141Sm 5/2+ N/A 1142.94 -
142Eu 141.92343(3) 2.36(10) s +áto 142Sm 1+ N/A 1151.02 -
143Eu 142.920298(12) 2.59(2) min +áto 143Sm 5/2+ N/A 1159.1 -
144Eu 143.918817(12) 10.2(1) s +áto 144Sm 1+ N/A 1176.49 -
145Eu 144.916265(4) 5.93(4) d EC to 145Sm 5/2+ 3.99 1184.57 -
146Eu 145.917206(7) 4.61(3) d EC to 146Sm 4- 1.43 1192.65 -
147Eu 146.916746(3) 24.1(6) d EC to 147Sm; a to 143Pm 5/2+ 3.72 1200.73 -
148Eu 147.918086(11) 54.5(5) d EC to 148Sm; a to 143Pm 5- 2.34 1208.81 -
149Eu 148.917931(5) 93.1(4) d EC to 149Sm 5/2+ 3.57 1216.88 -
150Eu 149.919702(7) 36.9(9) y EC to 150Sm 5(-) 2.71 1224.96 -
151Eu 150.9198502(26) 5Î1018 y a to 147Pm 5/2+ 3.4718 1233.04 47.81
152Eu 151.9217445(26) 13.537(6) y EC to 152Sm; ▀-áto 152Gd 3- -1.91 1231.8 -
153Eu 152.9212303(26) STABLE - 5/2+ 1.5331 1239.88 52.19
154Eu 153.9229792(26) 8.593(4) y EC to 154Sm; ▀-áto 154Gd 3- 2 1247.96 -
155Eu 154.9228933(27) 4.7611(13) y -áto 155Gd 5/2+ 1.6 1256.04 -
156Eu 155.924752(6) 15.19(8) d -áto 156Gd 0+ -2.01 1264.12 -
157Eu 156.925424(6) 15.18(3) h -áto 157Gd 5/2+ N/A 1272.2 -
158Eu 157.92785(8) 45.9(2) min -áto 158Gd (1-) N/A 1280.28 -
159Eu 158.929089(8) 18.1(1) min -áto 159Gd 5/2+ N/A 1288.35 -
160Eu 159.93197(22)# 38(4) s -áto 160Gd 1(-) N/A 1287.12 -
161Eu 160.93368(32)# 26(3) s -áto 161Gd 5/2+# N/A 1295.2 -
162Eu 161.93704(32)# 10.6(10) s -áto 162Gd N/A N/A 1303.27 -
163Eu 162.93921(54)# 6# s -áto 163Gd 5/2+# N/A 1311.35 -
164Eu 163.94299(64)# 2# s -áto 164Gd N/A N/A 1310.12 -
165Eu 164.94572(75)# 1# s -áto 165Gd 5/2+# N/A 1318.19 -
166Eu 165.94997(86)# 400# ms -áto 166Gd N/A N/A 1326.27 -
167Eu 166.95321(86)# 200# ms -áto 167Gd 5/2+# N/A 1325.04 -
Europium Elemental Symbol

Recent Research & Development for Europium

  • Copper nanocluster coupling europium as an off-to-on fluorescence probe for the determination of phosphate ion in water samples., 2015 Oct 1, Cao H, Chen Z, Huang Y. Talanta. 2015 Oct 1,
  • An Interfacial Europium Complex on SiO2 Nanoparticles: Reduction-Induced Blue Emission System., 2015 Jun 30, Ishii A, Hasegawa M. Sci Rep. 2015 Jun 30,
  • Europium(ii)-activated oxonitridosilicate yellow phosphor with excellent quantum efficiency and thermal stability - a robust spectral conversion material for highly efficient and reliable white LEDs., 2015 Jun 28, Wang L, Zhang H, Wang XJ, Dierre B, Suehiro T, Takeda T, Hirosaki N, Xie RJ. Phys Chem Chem Phys. 2015 Jun 28,
  • Optically stimulated persistent luminescence of europium-doped LaAlO3 nanocrystals., 2015 Jun 24, G┼éuchowski P, Str─Ök W, Lastusaari M, H├Âls├Ą J. Phys Chem Chem Phys. 2015 Jun 24,
  • Quantitative determination of fluoride in pure water using luminescent europium complexes., 2015 Jun 23, Butler SJ. Chem Commun (Camb). 2015 Jun 23,
  • Stereocontrolled Self-Assembly and Self-Sorting of Luminescent Europium Tetrahedral Cages., 2015 Jul 8, Yan LL, Tan CH, Zhang GL, Zhou LP, B├╝nzli JC, Sun QF. J Am Chem Soc. 2015 Jul 8,
  • The electronic properties of mixed valence hydrated europium chloride thin film., 2015 Jul 8, Silly MG, Charra F, Lux F, Lemercier G, Sirotti F. Phys Chem Chem Phys. 2015 Jul 8,
  • Europium, uranyl, and thorium-phenanthroline amide complexes in acetonitrile solution: an ESI-MS and DFT combined investigation., 2015 Jul 22, Xiao CL, Wang CZ, Mei L, Zhang XR, Wall N, Zhao YL, Chai ZF, Shi WQ. Dalton Trans. 2015 Jul 22,
  • Direct experimental observation of weakly-bound character of the attached electron in europium anion., 2015 Jul 22, Cheng SB, Castleman AW Jr. Sci Rep. 2015 Jul 22,
  • Enhanced energy transfer efficiency and stability of europium ╬▓-diketonate complex in ionic liquid-based lyotropic liquid crystals., 2015 Jul 20, Yi S, Wang J, Chen X. Phys Chem Chem Phys. 2015 Jul 20,