NbB2
NbB2 has a DFT band gap of Metallic / not reported across 134 reported structures in 23 space groups; its lowest-energy polymorph is hexagonal (P6/mmm (No. 191)). Cross-validated across 3 computational databases.
At a glance
Key Properties
Cross-validated computational properties for NbB2, 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.
Metallic / not reported
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)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
134
3 databases, 23 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for NbB2, 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. |
|---|---|---|---|---|---|
| P6/mmm (No. 191) | hexagonal | 0.00 | 0.0000 | -13.848 | 6.78 |
| C2 (No. 5) | Monoclinic | — | — | — | 4.69 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.33 |
| C2/m (No. 12) | Monoclinic | — | — | — | 4.82 |
| Cmcm (No. 63) | Orthorhombic | — | — | — | 4.79 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.01 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.83 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.80 |
| P-1 (No. 2) | Triclinic | — | — | — | 6.09 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.80 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.03 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.94 |
Reference
Frequently Asked Questions
Common questions about NbB2, answered from cross-validated data.
What is the band gap of NbB2?
NbB2 is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is NbB2 a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is NbB2 thermodynamically stable?
Yes — NbB2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of NbB2?
The lowest-energy reported polymorph of NbB2 is hexagonal symmetry, space group P6/mmm (No. 191).
What is the density of NbB2?
The computed density of the ground-state structure of NbB2 is 6.78 g/cm³.
How many polymorphs of NbB2 are known?
134 structures of NbB2 are reported across 3 databases, spanning 23 distinct space groups.
What elements does NbB2 contain?
NbB2 contains B and Nb (2 elements).
Where does the data for NbB2 come from?
NbB2 data is cross-referenced from materials_project, mpaloe, jarvis.
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Related Compounds
Other Ultra-High-Temperature Ceramics 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.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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