F2Fe2Na2O8S2
F2Fe2Na2O8S2 has a DFT band gap of 4.19 eV across 2 reported structures in 1 space group; its lowest-energy polymorph is monoclinic (C2/c (No. 15)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for F2Fe2Na2O8S2, aggregated across 2 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.
4.19 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)
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
2
2 databases, 1 space group
Crystallography
Reported Structures
Lowest-energy structures reported for F2Fe2Na2O8S2, 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. |
|---|---|---|---|---|---|
| C2/c (No. 15) | monoclinic | 4.19 | 0.0000 | -6.618 | 3.21 |
| C2/c (No. 15) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about F2Fe2Na2O8S2, answered from cross-validated data.
What is the band gap of F2Fe2Na2O8S2?
F2Fe2Na2O8S2 has a DFT-computed band gap of 4.19 eV across 2 reported structures.
More questions
Is F2Fe2Na2O8S2 a metal, semiconductor, or insulator?
With a wide band gap up to 4.19 eV it is an insulator / wide-band-gap material.
Is F2Fe2Na2O8S2 thermodynamically stable?
Yes — F2Fe2Na2O8S2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of F2Fe2Na2O8S2?
The lowest-energy reported polymorph of F2Fe2Na2O8S2 is monoclinic symmetry, space group C2/c (No. 15).
What is the density of F2Fe2Na2O8S2?
The computed density of the ground-state structure of F2Fe2Na2O8S2 is 3.21 g/cm³.
How many polymorphs of F2Fe2Na2O8S2 are known?
2 structures of F2Fe2Na2O8S2 are reported across 2 databases, spanning 1 distinct space group.
What elements does F2Fe2Na2O8S2 contain?
F2Fe2Na2O8S2 contains F, Fe, Na, O, and S (5 elements).
Where does the data for F2Fe2Na2O8S2 come from?
F2Fe2Na2O8S2 data is cross-referenced from materials_project, aflow.
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Related Compounds
Other Polyanion Sulfate Cathodes 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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