Ytterbium(III) oxide

Ytterbium(III) oxide
Names
	IUPAC name Ytterbium(III) oxide.
	Other names Ytterbia; diytterbium trioxide; ytterbium sesquioxide
Identifiers
CAS Number	1314-37-0 ;
ChemSpider	3337532;
ECHA InfoCard	100.013.850
EC Number	215-234-0;
PubChem CID	4124403;
UNII	T66CZ53RP4 ;
CompTox Dashboard (EPA)	DTXSID20893855 ;
Properties
Chemical formula	Yb2O3
Molar mass	394.08 g/mol
Appearance	White solid.
Density	9.17 g/cm3, solid.
Melting point	2,355 °C (4,271 °F; 2,628 K)
Boiling point	4,070 °C (7,360 °F; 4,340 K)
Solubility in water	Insoluble
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206
Coordination geometry	Octahedral
Thermochemistry
Std molar; entropy (S⦵298)	133.05 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	-1814.600 kJ/mol
Gibbs free energy (ΔfG⦵)	-1726.844 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P305+P351+P338
NFPA 704 (fire diamond)	1 0 1
Flash point	Non-flammable.
Related compounds
Other anions	Ytterbium(III) sulfide, Ytterbium(III) chloride
Other cations	Thulium(III) oxide; Lutetium(III) 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

Ytterbium(III) oxide is the chemical compound with the formula Yb₂O₃. It is one of the more commonly encountered compounds of ytterbium. It occurs naturally in trace amounts in the mineral gadolinite. It was first isolated from this in 1878 by Jean Charles Galissard de Marignac.

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