C2B8
C2B8 has a DFT band gap of 1.51–3.04 eV across 27 reported structures in 3 space groups; its lowest-energy polymorph is monoclinic (Cm (No. 8)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for C2B8, aggregated across 2 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.
1.51–3.04 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.
0.000 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.
On hull (stable)
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
27
2 databases, 3 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for C2B8, 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. |
|---|---|---|---|---|---|
| Cm (No. 8) | monoclinic | 3.04 | 0.0000 | -7.997 | 2.54 |
| R-3m (No. 166) | trigonal | 1.51 | 0.0812 | -7.916 | 2.49 |
| P1 (No. 1) | triclinic | 0.00 | 0.0973 | -7.900 | 2.43 |
| R-3m (No. 166) | trigonal | 0.00 | 0.9018 | -7.095 | 1.99 |
| R-3m (No. 166) | trigonal | 0.00 | 1.0526 | -6.944 | 1.24 |
| P1 (No. 1) | triclinic | 0.00 | 1.3735 | -6.624 | 2.43 |
| — | — | — | — | — | 2.70 |
| — | — | — | — | — | 2.46 |
| — | — | — | — | — | 2.65 |
| — | — | — | — | — | 2.40 |
| — | — | — | — | — | 2.12 |
| — | — | — | — | — | 2.39 |
Reference
Frequently Asked Questions
Common questions about C2B8, answered from cross-validated data.
What is the band gap of C2B8?
C2B8 has a DFT-computed band gap of 1.51–3.04 eV across 27 reported structures.
More questions
Is C2B8 a metal, semiconductor, or insulator?
With a wide band gap up to 3.04 eV it is an insulator / wide-band-gap material.
Is C2B8 thermodynamically stable?
Yes — C2B8 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of C2B8?
The lowest-energy reported polymorph of C2B8 is monoclinic symmetry, space group Cm (No. 8).
What is the density of C2B8?
The computed density of the ground-state structure of C2B8 is 2.54 g/cm³.
How many polymorphs of C2B8 are known?
27 structures of C2B8 are reported across 2 databases, spanning 3 distinct space groups.
What elements does C2B8 contain?
C2B8 contains B and C (2 elements).
Where does the data for C2B8 come from?
C2B8 data is cross-referenced from materials_project, omat24.
Explore
Related Compounds
Other Carbide Hard Materials in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
Analyze C2B8 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →