Titanium(III) oxide is the inorganic compound with the formula Ti2O3. A black semiconducting solid, it is prepared by reducing titanium dioxide with titanium metal at 1600 °C.[3]
 | |
| Names | |
|---|---|
| IUPAC name titanium(III) oxide | |
| Other names titanium sesquioxide | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.014.271 |
| EC Number |
|
PubChem CID | |
CompTox Dashboard (EPA) | |
| |
| |
| Properties | |
| Ti2O3 | |
| Molar mass | 143.76 g/mol |
| Appearance | violet black powder |
| Odor | odorless |
| Density | 4.49 g/cm3 |
| Melting point | 2,130 °C (3,870 °F; 2,400 K) (decomposes) |
| insoluble | |
| +125.6·10−6 cm3/mol | |
| Structure[1] | |
| Corundum | |
| R3c (No. 167) | |
a = 543 pm α = 56.75°, β = 90°, γ = 90° | |
| Hazards | |
| GHS labelling:[2] | |
 | |
| Warning | |
| H413 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Ti2O3 adopts the Al2O3 (corundum) structure.[3] It is reactive with oxidising agents.[3] At around 200 °C, there is a transition from semiconducting to metallic conducting.[3] Titanium(III) oxide occurs naturally as the extremely rare mineral in the form of tistarite.[4]
Other titanium(III) oxides include LiTi2O4 and LiTiO2.[5]