Thulium(III) oxide

Thulium(III) oxide

Names
Other names Thulium oxide, thulium sesquioxide
Identifiers
CAS Number	12036-44-1 Y
Jmol 3D model	Interactive image
PubChem	159411
InChI InChI=1S/3O.2Tm/q3*-2;2*+3
SMILES [O-2].[O-2].[O-2].[Tm+3].[Tm+3]
Properties
Chemical formula	Tm2O3
Molar mass	385.866 g/mol
Appearance	greenish-white cubic crystals
Density	8.6 g/cm3
Melting point	2,341 °C (4,246 °F; 2,614 K)
Boiling point	3,945 °C (7,133 °F; 4,218 K)
Solubility in water	slightly soluble in acids
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206
Related compounds
Other anions	Thulium(III) chloride
Other cations	Erbium(III) oxide Ytterbium(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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Infobox references

Thulium (III) oxide is a pale green solid compound, with the formula Tm₂O₃. It was first isolated in 1878 from an impure sample of erbia by Per Teodor Cleve, who named it thulia. It can be prepared in the laboratory by burning thulium metal in air, or by decomposition of their oxoacid salts, such as thulium nitrate.