HfB2
HfB2 has a DFT band gap of Metallic / not reported across 108 reported structures in 20 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 HfB2, 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.
108
3 databases, 20 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for HfB2, 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 | -21.033 | 11.24 |
| P6/mmm (No. 191) | Hexagonal | — | — | — | 11.40 |
| C2/m (No. 12) | Monoclinic | — | — | — | 11.10 |
| C2/c (No. 15) | Monoclinic | — | — | — | 5.57 |
| C2/c (No. 15) | Monoclinic | — | — | — | 5.86 |
| C2/c (No. 15) | Monoclinic | — | — | — | 5.86 |
| Cc (No. 9) | Monoclinic | — | — | — | 5.90 |
| C2/c (No. 15) | Monoclinic | — | — | — | 6.56 |
| Cc (No. 9) | Monoclinic | — | — | — | 7.56 |
| Pc (No. 7) | Monoclinic | — | — | — | 9.16 |
| P21 (No. 4) | Monoclinic | — | — | — | 7.67 |
| C2/m (No. 12) | Monoclinic | — | — | — | 11.08 |
Reference
Frequently Asked Questions
Common questions about HfB2, answered from cross-validated data.
What is the band gap of HfB2?
HfB2 is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is HfB2 a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is HfB2 thermodynamically stable?
Yes — HfB2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of HfB2?
The lowest-energy reported polymorph of HfB2 is hexagonal symmetry, space group P6/mmm (No. 191).
What is the density of HfB2?
The computed density of the ground-state structure of HfB2 is 11.24 g/cm³.
How many polymorphs of HfB2 are known?
108 structures of HfB2 are reported across 3 databases, spanning 20 distinct space groups.
What elements does HfB2 contain?
HfB2 contains B and Hf (2 elements).
Where does the data for HfB2 come from?
HfB2 data is cross-referenced from materials_project, mpaloe.
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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.
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