Europium, Eu

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

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.

Technical Data
Symbol Eu Density (25°C)/gcm 5.245
Atomic number 63 Melting point /°C 826
No. of naturally occurring isotopes 2 Boiling point /°C -1439
Atomic weight 151.96 ΔHvap/kJmol-1 176
Outer electron configuration 4f76s2 ΔHmonoatomic gas/kJmol-1 178
Metal radius( 6-coordinatc)/pm 208.4 ΔH(hydration Ln3+)/kJmol-1 3547
Ionic radius(6-coordinatc)/pm 111 94.7 Ionization cnergy/kJmol-1 I 547
Ionic radius(6-coordinatc)/pm 11 117 Ionization cnergy/kJmol-1 II 1085
Electrical resistivity (25 °C)/μohm cm 81 Ionization cnergy/kJmol-1 III 2425
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
280 Sublimes 360 Sublimes 480 Sublimes Fair Al2O3 - Tungsten & Tantalum Low tantalum solubility.

Evaporation Materials
E2-5000-M 1-4mm pieces
E2-5001-M Ingot (Please ask for sizes)
E2-5002-M pieces 12mm and smaller

The foils are available in either rectangular or circular shape. Please enter width and length or diameter of the required foil.

E2-3003-F 0.004" (0.1mm)
E2-3007-F 0.008" (0.2mm)
E2-2000-R 0.250" (6.35mm)
E2-2001-R 0.500" (12.7mm)
E2-4002-S 0.020" (0.5mm)
E2-4003-S 0.030" (0.76mm)
E2-4004-S 0.040" (1.0mm)