Cerium(III) oxide

Cerium(III) oxide
Names
	IUPAC name Cerium(III) oxide
	Other names Cerium sesquioxide
Identifiers
CAS Number	1345-13-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	8081132;
ECHA InfoCard	100.014.289
EC Number	234-374-3;
PubChem CID	9905479;
UNII	82Q2098IFG;
CompTox Dashboard (EPA)	DTXSID60149580 ;
	InChI InChI=1S/2Ce.3O/q2+3;3-2 Key: DRVWBEJJZZTIGJ-UHFFFAOYSA-N;
	SMILES [O-2].[O-2].[O-2].[Ce+3].[Ce+3];
Properties
Chemical formula	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)
Solubility in water	insoluble
Solubility in sulfuric acid	soluble
Solubility in hydrochloric acid	insoluble
Structure
Crystal structure	Hexagonal, hP5
Space group	P3m1, No. 164
Hazards
	GHS labelling:
Pictograms
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). verify (what is ?) Infobox references

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. According to X-ray crystallography, the Ce(III) ions are seven-coordinate, a motif typical for other trivalent lanthanide oxides.