• Rare earth metal China Eu2O3 Europium oxide

Europium oxide (Eu2O3), is a chemical compound of europium and oxygen. It is widely used as a red or blue phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based phosphors. It is also an agent for the manufacture of fluorescent glass. Europium fluorescence is used in the anti-counterfeiting phosphors in Euro banknotes.

Europium oxide has two common structures: Monoclinic (mS30, SpaceGroup = C2/m, No. 12) and cubic (cI80, SpaceGroup = Ia-3, No. 206). The cubic structure is similar to that of manganese oxide.

It may be formed by ignition of europium metal.

It can react with acids to form the corresponding europium salts.

Properties
Chemical formula Eu2O3
Molar mass 351.926 g/mol
Appearance white to light-pink solid powder
Odor odorless
Density 7.42 g/cm3
Melting point 2,350 °C (4,260 °F; 2,620 K)
Boiling point 4,118 °C (7,444 °F; 4,391 K)
Solubility in water Negligible
Magnetic susceptibility (χ) +10,100·10−6 cm3/mol
Thermal conductivity 2.45 W/(m K)
Application Used as a red or blue phosphor in television sets and fluorescent lamps, and as an activator for yttrium-based phosphors. It is also an agent for the manufacture of fluorescent glass
Structure
Crystal structure Monoclinic, Cubic

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