Fe2Se1Te1
Fe2Se1Te1 has a DFT band gap of Metallic / not reported across 25 reported structures in 15 space groups; its reference structure is tetragonal (P4mm (No. 99)). Cross-validated across 1 computational databases.
Key Properties
Cross-validated computational properties for Fe2Se1Te1, aggregated across 1 database.
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 Fe2Se1Te1. Tight agreement means computed properties can be trusted without re-running calculations.
Only 1 independent DFT source (materials_project) reports a hull energy for Fe2Se1Te1, so cross-source agreement can't be assessed yet.
Reported Structures
Lowest-energy structures reported for Fe2Se1Te1, 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. |
|---|---|---|---|---|---|
| P4mm (No. 99) | tetragonal | 0.00 | 0.1858 | -6.136 | 6.31 |
| Pm (No. 6) | monoclinic | — | — | -6.024 | 6.57 |
| Cm (No. 8) | monoclinic | — | — | -5.883 | 6.68 |
| P2/m (No. 10) | monoclinic | — | — | -5.616 | 6.91 |
| P2/m (No. 10) | monoclinic | — | — | -5.544 | 6.60 |
| C2/m (No. 12) | monoclinic | — | — | -5.380 | 7.01 |
| Cmm2 (No. 35) | orthorhombic | — | — | -5.871 | 6.70 |
| Imm2 (No. 44) | orthorhombic | — | — | -5.704 | 7.40 |
| Pmmm (No. 47) | orthorhombic | — | — | -5.346 | 7.25 |
| Immm (No. 71) | orthorhombic | — | — | -5.484 | 7.16 |
| P4mm (No. 99) | tetragonal | — | — | -5.883 | 6.87 |
| P4mm (No. 99) | tetragonal | — | — | -5.881 | 6.98 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Fe2Se1Te1.
Frequently Asked Questions
Common questions about Fe2Se1Te1, answered from cross-validated data.
What is the band gap of Fe2Se1Te1?
The reported DFT structures of Fe2Se1Te1 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 Fe2Se1Te1 a metal, semiconductor, or insulator?
What is the crystal structure of Fe2Se1Te1?
What is the density of Fe2Se1Te1?
How many polymorphs of Fe2Se1Te1 are known?
How is Fe2Se1Te1 synthesized?
What elements does Fe2Se1Te1 contain?
Where does the data for Fe2Se1Te1 come from?
Related Compounds
Other Iron-Based Superconductors 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)
- aflow — Data from AFLOW (aflow.org). Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012). (CC-BY-4.0)
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