Samarium(III) oxide

Samarium(III) oxide
Samarium(III) oxide
Names
IUPAC name
samarium(III) oxide
Other names
samarium sesquioxide, samaria
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.845 Edit this at Wikidata
EC Number
  • 235-043-6
UNII
  • InChI=1S/3O.2Sm/q3*-2;2*+3 checkY
    Key: FKTOIHSPIPYAPE-UHFFFAOYSA-N checkY
  • O=[Sm]O[Sm]=O
  • [Sm+3].[Sm+3].[O-2].[O-2].[O-2]
Properties
Sm2O3
Molar mass 348.72 g/mol
Appearance yellow-white crystals
Density 8.347 g/cm3
Melting point 2,335 °C (4,235 °F; 2,608 K)
Boiling point Not Stated
insoluble
+1988.0·10−6 cm3/mol
Structure
Cubic, cI80
Ia-3, No. 206
Hazards
GHS labelling:
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H319, H410
P264, P273, P280, P305+P351+P338, P337+P313, P391, P501
Related compounds
Other anions
Samarium(III) chloride
Other cations
Promethium(III) oxide, Europium(III) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Samarium(III) oxide (Sm2O3) is a chemical compound. Samarium oxide readily forms on the surface of samarium metal under humid conditions or temperatures in excess of 150°C in dry air. Similar to rust on metallic iron, this oxide layer spalls off the surface of the metal, exposing more metal to continue the reaction. The oxide is commonly white to off yellow in color and is often encountered as a highly fine dust like powder.