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	ΔH_vap/kJmol^-1	176
Outer electron configuration	4f⁷6s²	ΔH_{monoatomic gas}/kJmol^-1	178
Metal radius( 6-coordinatc)/pm	208.4	ΔH_{(hydration Ln}³⁺_)/kJmol^-1	3547
Ionic radius(6-coordinatc)/pm 111	94.7	Ionization cnergy/kJmol^-1I	547
Ionic radius(6-coordinatc)/pm 11	117	Ionization cnergy/kJmol^-1II	1085
Electrical resistivity (25 °C)/μohm cm	81	Ionization cnergy/kJmol^-1III	2425

Evaporation Techniques
Temperature (^oC) @Vap. Pressure			Techniques				Remarks
10^-8 Torr	10^-6 Torr	10^-4 Torr	Electron Beam	Crucible	Coil	Boat	Remarks
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.

Foil
E2-3003-F 0.004" (0.1mm)
E2-3007-F 0.008" (0.2mm)

Rods
E2-2000-R 0.250" (6.35mm)
E2-2001-R 0.500" (12.7mm)

Sheet
E2-4002-S 0.020" (0.5mm)
E2-4003-S 0.030" (0.76mm)
E2-4004-S 0.040" (1.0mm)

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