Europium(III) oxide

Europium(III) 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.^[2]

Europium(III) oxide

Identifiers
CAS Number	1308-96-9 Y
3D model (JSmol)	Interactive image
ChemSpider	3441840 Y
ECHA InfoCard	100.013.787
PubChem CID	159371
UNII	44642614WR Y
CompTox Dashboard (EPA)	DTXSID80152733
InChI InChI=1S/2Eu.3O Y Key: RSEIMSPAXMNYFJ-UHFFFAOYSA-N Y InChI=1/2Eu.3O/rEu2O3/c3-1-5-2-4 Key: RSEIMSPAXMNYFJ-NRICTGFVAC
SMILES O=[Eu]O[Eu]=O
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)[1]
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)
Structure
Crystal structure	cubic, cI80, Monoclinic
Space group	Ia-3, No. 206, C2/m, No. 12
Hazards
Lethal dose or concentration (LD, LC):
LD50 (median dose)	5000 mg/kg (rat, oral)
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Europium(III) chloride
Other cations	Samarium(III) oxide, Gadolinium(III) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Europium oxide has two common structures: Monoclinic (mS30, space group C2/m, No. 12)^[3] and cubic (cI80, space group Ia3, No. 206).^[4] The cubic structure is similar to that of manganese(III) oxide.

It may be formed by ignition of europium metal.^[5][6]

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

Gallery

• 
  Cubic Eu₂O₃
• 
  Monoclinic Eu₂O₃

References

1. Webelements Europium trioxide
2. "Europium and the Euro". Archived from the original on 2009-08-04. Retrieved 2009-06-04.
3. "ICSD Entry: 631453". Cambridge Structural Database: Access Structures. Cambridge Crystallographic Data Centre. Retrieved 2022-07-04.
4. Heiba, Z. K.; Akin, Y.; Sigmund, W.; Hascicek, Y. S. (2003). "X-ray structure and microstructure determination of the mixed sesquioxides (Eu_1−xYb_x)₂O₃ prepared by a sol–gel process". J. Appl. Crystallogr. 36 (6): 1411–1416. doi:10.1107/S0021889803019319.
5. Ugale, Akhilesh; Kalyani, Thejo N.; Dhoble, Sanjay J. (2018). "Chapter 2 - Potential of europium and samarium β-diketonates as red light emitters in organic light-emitting diodes". In Martín-Ramos, Pablo; Ramos Silva, Manuela (eds.). Lanthanide-Based Multifunctional Materials: From OLEDs to SIMs. Elsevier. pp. 59–97. doi:10.1016/B978-0-12-813840-3.00002-8. ISBN 978-0-12-813840-3.
6. "Europium". ScienceDirect. Elsevier. Retrieved 2022-07-04. Europium is the most reactive rare-earth element... It swiftly oxidizes in air, ignites in the range of 150–180°C to form Eu³⁺ oxide (Eu₂O₃).