Thulium(III) oxide

Thulium(III) oxide
Names
	IUPAC name Thulium(III) oxide
	Other names Thulium oxide, thulium sesquioxide
Identifiers
CAS Number	12036-44-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	140188;
ECHA InfoCard	100.031.670
EC Number	234-851-6;
PubChem CID	159411;
UNII	DZJ5EE05EB ;
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	Slightly soluble in acids
Magnetic susceptibility (χ)	+51,444·10−6 cm3/mol
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206
Lattice constant	a = 10.49 Å
Formula units (Z)	16
Thermochemistry
Heat capacity (C)	2.515 °Cp (25 °C)
Hazards
	GHS labelling:
Pictograms
Safety data sheet (SDS)	Sigma-Aldrich
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). verify (what is ?) Infobox references

Thulium(III) oxide is a pale green crystalline 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.