Ta2B
Ta2B has a DFT band gap of Metallic / not reported across 148 reported structures in 20 space groups; its reference structure 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
3 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
148
3 databases, 20 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Ta2B. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
0.99 / 1.00
Trust tier: high
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.003 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
3
jarvis, materials_project, oqmd
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
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 |
| — | — | 0.00 | 0.0337 | -0.528 | — |
| I4/mcm (No. 140) | tetragonal | 0.00 | 0.0364 | -0.501 | — |
| — | — | 0.00 | 2.2553 | 1.694 | — |
| — | — | 0.00 | 3.2043 | 2.643 | — |
| C2 (No. 5) | monoclinic | — | — | — | 10.92 |
| C2 (No. 5) | monoclinic | — | — | — | 10.10 |
| C2 (No. 5) | monoclinic | — | — | — | 13.73 |
| C2 (No. 5) | monoclinic | — | — | — | 10.91 |
| C2 (No. 5) | monoclinic | — | — | — | 15.00 |
| Cm (No. 8) | monoclinic | — | — | — | 10.30 |
| C2 (No. 5) | monoclinic | — | — | — | 10.13 |
Reference
Frequently Asked Questions
Common questions about Ta2B, answered from cross-validated data.
What is the band gap of Ta2B?
The reported DFT structures of Ta2B show no band gap. Standard DFT often misses gaps (especially in transition-metal oxides), so this is not proof the real material is a metal.
More questions
Is Ta2B a metal, semiconductor, or insulator?
DFT calculations predict no band gap. Standard DFT can miss gaps, so measurements are needed to confirm metallic behavior.
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 reference structure 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?
148 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, oqmd, jarvis, mpaloe.
Explore
Related Compounds
Other Ultra-High-Temperature Ceramics in the database.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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