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Cr₂O₃
Chromium(III) oxide
IUPAC : Chromium(III) oxide
OxideMineralIndustrialMineral/geological
Highly stable green pigment and refractory oxide. Corundum structure (isomorphous with Al₂O₃). Used in paint, metallurgy and as a polishing abrasive.
3D ball-and-stick representation of Chromium(III) oxide (formula Cr₂O₃). Constituent atoms: Cr, O.
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Physical properties
Molar mass151.99 g/mol
State at 20 °Csolid
Density5.22 g/cm³
Melting point2708.00 K (2435 °C)
Boiling point4273.00 K (4000 °C)
Solubility (H₂O)insoluble
Structure
Crystal systemRhombohedral
3D render modeBall-and-stick
Uses and applications
- Green pigment for paints, ceramics and glass
- Metallurgical refractory
- Fine polishing abrasive (green rouge paste)
- Catalyst (Fischer-Tropsch, dehydrogenation)
- Synthetic ruby colorant (traces of Cr³⁺ in Al₂O₃)
Safety (GHS)
GHS07 · Harmful / irritant
H statements : H315, H319, H335
Irritant. Note: do not confuse with chromium(VI) compounds, which are carcinogenic (Cr₂O₃ is chromium III, far less toxic).
Constituent elements
References
Sources : PubChem CID 517277 · CRC Handbook of Chemistry and Physics