Ta2B
Ta2B has a DFT band gap of Metallic / not reported across 146 reported structures in 20 space groups; its lowest-energy polymorph is tetragonal (I4/mcm (No. 140)). Cross-validated across 3 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Ta2B, 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.
0.034 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.
Metastable
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
146
3 databases, 20 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Ta2B, 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. |
|---|---|---|---|---|---|
| I4/mcm (No. 140) | tetragonal | 0.00 | 0.0337 | -35.412 | 15.15 |
| P-1 (No. 2) | Triclinic | — | — | — | 12.12 |
| P1 (No. 1) | Triclinic | — | — | — | 10.96 |
| P1 (No. 1) | Triclinic | — | — | — | 11.79 |
| Pc (No. 7) | Monoclinic | — | — | — | 11.52 |
| Pc (No. 7) | Monoclinic | — | — | — | 15.87 |
| Pc (No. 7) | Monoclinic | — | — | — | 14.10 |
| Cm (No. 8) | Monoclinic | — | — | — | 10.30 |
| C2/m (No. 12) | Monoclinic | — | — | — | 16.36 |
| C2/m (No. 12) | Monoclinic | — | — | — | 14.09 |
| P-1 (No. 2) | Triclinic | — | — | — | 12.02 |
| P1 (No. 1) | Triclinic | — | — | — | 6.71 |
Reference
Frequently Asked Questions
Common questions about Ta2B, answered from cross-validated data.
What is the band gap of Ta2B?
Ta2B is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is Ta2B a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is Ta2B thermodynamically stable?
Ta2B has a lowest energy above hull of 0.034 eV/atom (metastable).
What is the crystal structure of Ta2B?
The lowest-energy reported polymorph of Ta2B is tetragonal symmetry, space group I4/mcm (No. 140).
What is the density of Ta2B?
The computed density of the ground-state structure of Ta2B is 15.15 g/cm³.
How many polymorphs of Ta2B are known?
146 structures of Ta2B are reported across 3 databases, spanning 20 distinct space groups.
What elements does Ta2B contain?
Ta2B contains B and Ta (2 elements).
Where does the data for Ta2B come from?
Ta2B 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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