Ta3AlC2
Ta3AlC2 has a DFT band gap of Metallic / not reported across 5 reported structures in 1 space group; its reference structure is hexagonal (P63/mmc (No. 194)). Cross-validated across 3 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Ta3AlC2, 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.
Stable
3 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
5
3 databases, 1 space group
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Ta3AlC2. 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.
1.00 / 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.
0.000 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 Ta3AlC2, 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. |
|---|---|---|---|---|---|
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0000 | -29.368 | 12.42 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0000 | -0.600 | — |
| — | — | 0.00 | 0.0000 | -0.575 | — |
| P63/mmc (No. 194) | hexagonal | — | — | — | 12.25 |
| P63/mmc (No. 194) | hexagonal | — | — | — | 12.77 |
| P63/mmc (No. 194) | hexagonal | — | — | — | 12.34 |
| P63/mmc (No. 194) | hexagonal | — | — | — | 12.47 |
| P63/mmc (No. 194) | hexagonal | — | — | — | 12.41 |
Synthesis
Synthesis Routes
Literature-extracted synthesis procedures targeting Ta3AlC2.
Solid State
Procedure available · ceder_solid_state
Reference
Frequently Asked Questions
Common questions about Ta3AlC2, answered from cross-validated data.
What is the band gap of Ta3AlC2?
The reported DFT structures of Ta3AlC2 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 Ta3AlC2 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 Ta3AlC2 thermodynamically stable?
Yes — Ta3AlC2 sits on the convex hull (energy above hull 0 eV/atom), i.e. stable.
What is the crystal structure of Ta3AlC2?
The reference structure of Ta3AlC2 is hexagonal symmetry, space group P63/mmc (No. 194).
What is the density of Ta3AlC2?
The computed density of the ground-state structure of Ta3AlC2 is 12.42 g/cm³.
How many polymorphs of Ta3AlC2 are known?
5 structures of Ta3AlC2 are reported across 3 databases, spanning 1 distinct space group.
How is Ta3AlC2 synthesized?
Literature-reported routes for Ta3AlC2 include solid state.
What elements does Ta3AlC2 contain?
Ta3AlC2 contains Al, C, and Ta (3 elements).
Where does the data for Ta3AlC2 come from?
Ta3AlC2 data is cross-referenced from materials_project, jarvis, oqmd, mpaloe, cod.
Explore
Related Compounds
Other MAX Phases 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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- 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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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