Europium(III) oxide

{{chembox

| Watchedfields = changed

| verifiedrevid = 477000927

| Name = Europium(III) oxide

| ImageFile = Eu2O3.powder.jpg

| ImageFile2 =

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 3441840

| InChI = 1/2Eu.3O/rEu2O3/c3-1-5-2-4

| SMILES = O=[Eu]O[Eu]=O

| InChIKey = RSEIMSPAXMNYFJ-NRICTGFVAC

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/2Eu.3O

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = RSEIMSPAXMNYFJ-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 1308-96-9

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 44642614WR

| PubChem = 159371

}}

|Section2={{Chembox Properties

| Formula = Eu₂O₃

| Appearance = white to light-pink solid powder

| Odor = odorless

| MolarMass = 351.926 g/mol

| MeltingPtC = 2350

| MeltingPt_ref = [http://webelements.com/compounds/europium/dieuropium_trioxide.html Webelements Europium trioxide]

| BoilingPtC = 4118

| Density = 7.42 g/cm³

| Solubility = Negligible

| MagSus = +10,100·10⁻⁶ cm³/mol

| ThermalConductivity = 2.45 W/(m K)

}}

|Section3={{Chembox Structure

| CrystalStruct = cubic, cI80, Monoclinic

| SpaceGroup = Ia-3, No. 206, C2/m, No. 12

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|Section7={{Chembox Hazards

| ExternalSDS = [http://www.espimetals.com/msds's/europiumoxide.pdf External MSDS]

| LD50 = 5000 mg/kg (rat, oral)

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|Section8={{Chembox Related

| OtherAnions = Europium(III) chloride

| OtherCations = Samarium(III) oxide, Gadolinium(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.{{Cite web |url=http://www.smarterscience.com/eurosandeuropium.html |title=Europium and the Euro |access-date=2009-06-04 |archive-date=2009-08-04 |archive-url=https://web.archive.org/web/20090804012831/http://www.smarterscience.com/eurosandeuropium.html |url-status=dead }}

Europium oxide has two common structures: Monoclinic (mS30, space group C2/m, No. 12){{ Cite journal | url = https://www.ccdc.cam.ac.uk/structures/Search?Ccdcid=1754463&DatabaseToSearch=Published | title = ICSD Entry: 631453 | website = Cambridge Structural Database: Access Structures | publisher = Cambridge Crystallographic Data Centre | access-date = 2022-07-04 }} and cubic (cI80, space group Ia{{Overline|3}}, No. 206).{{ cite journal | title = X-ray structure and microstructure determination of the mixed sesquioxides (Eu_1−xYb_x)₂O₃ prepared by a sol–gel process | first1 = Z. K. | last1 = Heiba | first2 = Y. | last2 = Akin | first3 = W. | last3 = Sigmund | first4 = Y. S. | last4 = Hascicek | journal = J. Appl. Crystallogr. | year = 2003 | volume = 36 | issue = 6 | pages = 1411–1416 | doi = 10.1107/S0021889803019319 }} The cubic structure is similar to that of manganese(III) oxide.

It may be formed by ignition of europium metal.{{ cite book | first1 = Akhilesh | last1 = Ugale | first2 = Thejo N. | last2 = Kalyani | first3 = Sanjay J. | last3 = Dhoble | year = 2018 | editor-first1 = Pablo | editor-last1 = Martín-Ramos | editor-first2 = Manuela | editor-last2 = Ramos Silva | title = Lanthanide-Based Multifunctional Materials: From OLEDs to SIMs | publisher = Elsevier | pages = 59–97 |chapter= Chapter 2 - Potential of europium and samarium β-diketonates as red light emitters in organic light-emitting diodes | doi = 10.1016/B978-0-12-813840-3.00002-8 | isbn = 978-0-12-813840-3 }}{{ cite web | url = https://www.sciencedirect.com/topics/materials-science/europium | title = Europium | author = | date = | website = ScienceDirect | publisher = Elsevier | access-date = 2022-07-04 | quote = "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)." }}

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