S2Ta
S2Ta has a DFT band gap of Metallic / not reported across 18 reported structures in 8 space groups; its reference structure is trigonal (R-3m (No. 166)). Cross-validated across 3 computational databases.
Key Properties
Cross-validated computational properties for S2Ta, 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.
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.
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.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of S2Ta. Tight agreement means computed properties can be trusted without re-running calculations.
Only 1 independent DFT source (materials_project) reports a hull energy for S2Ta, so cross-source agreement can't be assessed yet.
Reported Structures
Lowest-energy structures reported for S2Ta, 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. |
|---|---|---|---|---|---|
| R3m (No. 160) | trigonal | 0.00 | 0.0000 | -8.095 | 6.67 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0010 | -8.094 | 6.72 |
| R3m (No. 160) | trigonal | 0.00 | 0.0024 | -8.093 | 6.68 |
| Fmm2 (No. 42) | orthorhombic | 0.00 | 0.0135 | -8.082 | 3.68 |
| P-3m1 (No. 164) | trigonal | 0.00 | 0.0161 | -8.079 | 6.66 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0164 | -8.079 | 4.79 |
| R-3m (No. 166) | trigonal | 0.00 | 0.0167 | -8.078 | 6.50 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.0175 | -8.077 | 3.59 |
| R-3m (No. 166) | trigonal | 0.00 | 0.0178 | -8.077 | 6.46 |
| P6/mmm (No. 191) | hexagonal | 0.00 | 1.6045 | -6.490 | 5.36 |
| P-62c (No. 190) | hexagonal | — | — | — | 4.64 |
| P63/mmc (No. 194) | hexagonal | — | — | — | 7.07 |
Synthesis Routes
Literature-extracted synthesis procedures targeting S2Ta.
Frequently Asked Questions
Common questions about S2Ta, answered from cross-validated data.
What is the band gap of S2Ta?
The reported DFT structures of S2Ta 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.
Is S2Ta a metal, semiconductor, or insulator?
Is S2Ta thermodynamically stable?
What is the crystal structure of S2Ta?
What is the density of S2Ta?
How many polymorphs of S2Ta are known?
How is S2Ta synthesized?
What elements does S2Ta contain?
Where does the data for S2Ta come from?
Related Compounds
Other Transition-Metal Dichalcogenides 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)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- nomad — Data from NOMAD (nomad-lab.eu). Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019). (CC-BY-4.0)
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