Thulium(III) oxide is a pale green solid compound, with the formula Tm₂O₃. It was first isolated in 1879, from an impure sample of erbia, by Swedish chemist 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.^[1]

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Thulium(III) oxide

Names
Other names Thulium oxide, thulium sesquioxide
Identifiers
CAS Number	12036-44-1 Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.031.670
PubChem CID	159411
UNII	DZJ5EE05EB Y
CompTox Dashboard (EPA)	DTXSID50894774
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
Magnetic susceptibility (χ)	+51,444·10−6 cm3/mol
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). N verify (what is YN ?) Infobox references

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