OsC
Osmium carbide is a hard, refractory ceramic material composed of osmium and carbon. It is primarily studied for its extreme mechanical hardness and potential utility in specialized industrial applications requiring high wear resistance.
COs
Overview
Key Properties
Cross-validated computational properties for OsC, aggregated across 3 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.
0.15–0.30 eV
Range across DFT structures
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.
0.717 eV/atom
Best (lowest) across sources
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.
Above hull
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
411
3 databases, 44 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for OsC, 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. |
|---|---|---|---|---|---|
| F-43m (No. 216) | cubic | 0.15 | 0.7170 | -30.749 | 13.69 |
| P213 (No. 198) | cubic | 0.30 | 0.7766 | -30.690 | 15.08 |
| P-6m2 (No. 187) | hexagonal | 0.00 | 0.9161 | -30.550 | 16.34 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.9278 | -30.538 | 16.42 |
| Fm-3m (No. 225) | cubic | 0.00 | 1.3918 | -30.074 | 16.18 |
| Pm-3m (No. 221) | cubic | 0.00 | 1.4795 | -29.987 | 17.11 |
| C2/m (No. 12) | Monoclinic | — | — | — | 11.23 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.49 |
| P-1 (No. 2) | Triclinic | — | — | — | 13.45 |
| P-1 (No. 2) | Triclinic | — | — | — | 17.40 |
| P21/m (No. 11) | Monoclinic | — | — | — | 17.51 |
| C2/m (No. 12) | Monoclinic | — | — | — | 9.55 |
Uses
Applications
Where OsC is used.
Hard coatingsWear-resistant componentsMaterials science research
Reference
Frequently Asked Questions
Common questions about OsC, answered from cross-validated data.
What is OsC?
Osmium carbide is a hard, refractory ceramic material composed of osmium and carbon. It is primarily studied for its extreme mechanical hardness and potential utility in specialized industrial applications requiring high wear resistance.
More questions
What is OsC used for?
OsC is used in hard coatings, wear-resistant components, and materials science research.
What is the band gap of OsC?
OsC has a DFT-computed band gap of 0.15–0.30 eV across 411 reported structures.
Is OsC a metal, semiconductor, or insulator?
With a band gap up to 0.30 eV it is a semiconductor.
Is OsC thermodynamically stable?
OsC has a lowest energy above hull of 0.717 eV/atom (above hull).
What is the crystal structure of OsC?
The lowest-energy reported polymorph of OsC is cubic symmetry, space group F-43m (No. 216).
What is the density of OsC?
The computed density of the ground-state structure of OsC is 13.69 g/cm³.
How many polymorphs of OsC are known?
411 structures of OsC are reported across 3 databases, spanning 44 distinct space groups.
What elements does OsC contain?
OsC contains C and Os (2 elements).
Where does the data for OsC come from?
OsC data is cross-referenced from materials_project, mpaloe.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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