 | |
| Names | |
|---|---|
| IUPAC name Thulium(III) oxide | |
| Other names Thulium oxide, thulium sesquioxide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.031.670 |
| EC Number |
|
| UNII | |
| |
| |
| Properties | |
| Tm2O3 | |
| Molar mass | 385.866 g/mol |
| Appearance | greenish-whitecubic 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 |
| +51,444·10−6 cm3/mol | |
| Structure | |
| Cubic,cI80[1] | |
| Ia-3, No. 206[1] | |
a = 10.49 Å[1] | |
Formula units (Z) | 16[1] |
| Thermochemistry | |
| 2.515 °Cp[2] (25 °C) | |
| Hazards | |
| GHS labelling: | |
 | |
| Safety data sheet (SDS) | Sigma-Aldrich |
| Related compounds | |
Otheranions | Thulium(III) chloride |
Othercations | Erbium(III) oxide Ytterbium(III) oxide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Thulium(III) oxide is a pale green crystalline compound, with the formulaTm2O3. It was first isolated in 1879, from an impure sample oferbia, bySwedishchemistPer Teodor Cleve, who named itthulia.
Thulium(III) oxide has been made in the laboratory using various methods. One method involves burningthulium metal or its various salts in air.[3][2]
Thulium(III) oxide can be made using a hydrothermal method wherethulium(III) acetate is mixed with anammonia solution, which causes thulium(III) oxide to precipitate as a white solid.[1]
Thulium(III) oxide (Tm2O3) is a pale green, thermally stable powder with a high melting point of 2,341 °C and a density of 8.6 g/cm3, typically forming a cubic crystal structure.[4] It is resistant to oxidation and dissolves in strong acids likehydrochloric acid, allowing it to form solublethulium salts.[5] Due to its unique f-electron configuration, Tm₂O₃ has notable optical properties.[6] Thulium oxide (Tm₂O₃) is considered fibrogenic; it has the potential to induce tissue injury andfibrosis when inhaled or otherwise introduced to biological tissue.[7]
