Cerium(III) oxide

Cerium(III) oxide, also known as cerium oxide, cerium trioxide, cerium sesquioxide, cerous oxide or dicerium trioxide, is an oxide of the rare-earth metal cerium. It has chemical formula Ce2O3 and is gold-yellow in color.

For the other compound also known as cerium oxide, see Cerium(IV) oxide.
Cerium(III) oxide
Names
IUPAC name
Cerium(III) oxide
Other names
Cerium sesquioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.014.289
EC Number
  • 234-374-3
UNII
  • InChI=1S/2Ce.3O/q2*+3;3*-2
    Key: DRVWBEJJZZTIGJ-UHFFFAOYSA-N
  • [O-2].[O-2].[O-2].[Ce+3].[Ce+3]
Properties
Ce2O3
Molar mass 328.229 g·mol−1
Appearance yellow-green dust
Density 6.2 g/cm3
Melting point 2,177 °C (3,951 °F; 2,450 K)
Boiling point 3,730 °C (6,750 °F; 4,000 K)
insoluble
Solubility in sulfuric acid soluble
Solubility in hydrochloric acid insoluble
Structure
Hexagonal, hP5
P3m1, No. 164
Hazards
GHS labelling:
Related compounds
Other anions
 Cerium(III) chloride
Other cations
 Lanthanum(III) oxide, Praseodymium(III) oxide
Related compounds
 Cerium(IV) 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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Infobox references
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