Cr2O3
Chromium(III) oxide · Chromia, Chrome green, Chromium sesquioxide
Chromium(III) oxide is a stable inorganic compound that appears as a vibrant green powder. It is widely valued for its exceptional durability and resistance to chemical degradation, making it a primary pigment and a key component in industrial surface treatments.
Key Properties
Cross-validated computational properties for Chromium(III) oxide, aggregated across 5 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for Cr2O3, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| R-3c (No. 167) | trigonal | 0.00 | 0.0000 | -9.197 | 5.17 |
| Pbcn (No. 60) | orthorhombic | 2.41 | 0.0383 | -9.158 | 5.34 |
| Ia-3 (No. 206) | cubic | 1.83 | 0.0466 | -9.150 | 5.05 |
| R-3 (No. 148) | trigonal | 0.00 | 0.0764 | -9.120 | 4.86 |
| Cmcm (No. 63) | orthorhombic | 0.77 | 0.2998 | -8.897 | 4.34 |
| C2/c (No. 15) | monoclinic | 1.22 | 0.3242 | -8.872 | 3.53 |
| P1 (No. 1) | triclinic | 0.77 | 0.3617 | -8.835 | 4.25 |
| P1 (No. 1) | triclinic | 0.61 | 0.3632 | -8.833 | 4.26 |
| P1 (No. 1) | triclinic | 0.27 | 0.3635 | -8.833 | 4.40 |
| P1 (No. 1) | triclinic | 0.71 | 0.3705 | -8.826 | 4.30 |
| P1 (No. 1) | triclinic | 0.35 | 0.4070 | -8.790 | 4.13 |
| P1 (No. 1) | triclinic | 0.52 | 0.4233 | -8.773 | 4.28 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Cr2O3.
Applications
Where Chromium(III) oxide is used.
Frequently Asked Questions
Common questions about Chromium(III) oxide, answered from cross-validated data.
What is Cr2O3?
Chromium(III) oxide is a stable inorganic compound that appears as a vibrant green powder. It is widely valued for its exceptional durability and resistance to chemical degradation, making it a primary pigment and a key component in industrial surface treatments.
What is Cr2O3 used for?
What is the band gap of Cr2O3?
Is Cr2O3 a metal, semiconductor, or insulator?
Is Cr2O3 thermodynamically stable?
What is the crystal structure of Cr2O3?
What is the density of Cr2O3?
How many polymorphs of Cr2O3 are known?
How is Cr2O3 synthesized?
What elements does Cr2O3 contain?
Where does the data for Cr2O3 come from?
Related Compounds
Other Spinel Oxide Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
Analyze Cr2O3 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →