Se4W2
Se4W2 has a DFT band gap of 1.23–1.54 eV across 32 reported structures in 11 space groups; its lowest-energy polymorph is hexagonal (P63/mmc (No. 194)). Cross-validated across 3 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Se4W2, 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.
1.23–1.54 eV
Range across DFT structures
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.
32
3 databases, 11 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Se4W2, 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 | 1.45 | 0.0000 | -27.267 | 8.66 |
| P-3m1 (No. 164) | trigonal | 1.52 | 0.0043 | -27.263 | 6.54 |
| P-6m2 (No. 187) | hexagonal | 1.23 | 0.0055 | -27.262 | 6.00 |
| P-3m1 (No. 164) | trigonal | 1.52 | 0.0082 | -27.259 | 4.95 |
| P-6m2 (No. 187) | hexagonal | 1.54 | 0.0158 | -27.252 | 3.57 |
| C2/m (No. 12) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| I4/mcm (No. 140) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| P6/mmm (No. 191) | — | — | — | — | — |
| Cm (No. 8) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about Se4W2, answered from cross-validated data.
What is the band gap of Se4W2?
Se4W2 has a DFT-computed band gap of 1.23–1.54 eV across 32 reported structures.
More questions
Is Se4W2 a metal, semiconductor, or insulator?
With a band gap up to 1.54 eV it is a semiconductor.
Is Se4W2 thermodynamically stable?
Yes — Se4W2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of Se4W2?
The lowest-energy reported polymorph of Se4W2 is hexagonal symmetry, space group P63/mmc (No. 194).
What is the density of Se4W2?
The computed density of the ground-state structure of Se4W2 is 8.66 g/cm³.
How many polymorphs of Se4W2 are known?
32 structures of Se4W2 are reported across 3 databases, spanning 11 distinct space groups.
What elements does Se4W2 contain?
Se4W2 contains Se and W (2 elements).
Where does the data for Se4W2 come from?
Se4W2 data is cross-referenced from materials_project, aflow.
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Related Compounds
Other Transition-Metal Dichalcogenides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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