K2Na2O8S2
K2Na2O8S2 is a stable, wide-gap insulating inorganic compound composed of potassium, sodium, oxygen, and sulfur.
About K2Na2O8S2
K2Na2O8S2 is an inorganic compound characterized by its wide-gap insulating electronic structure. Its composition of potassium, sodium, oxygen, and sulfur suggests a complex crystalline architecture that remains a subject of interest for structural chemistry studies.
Because it is identified as a near-hull material, this compound is considered thermodynamically stable and likely synthesizable in a laboratory setting. With multiple reported structures across databases, it serves as a valuable entry point for researchers investigating the stability and properties of alkali metal sulfur-oxygen systems.
Key Properties
Cross-validated computational properties for K2Na2O8S2, 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.
Reported Structures
Lowest-energy structures reported for K2Na2O8S2, 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. |
|---|---|---|---|---|---|
| P3m1 (No. 156) | trigonal | 4.97 | 0.0147 | -5.996 | 2.75 |
| P-3m1 (No. 164) | trigonal | 5.07 | 0.0344 | -5.976 | 2.59 |
| — | — | — | — | — | 2.38 |
| P3m1 (No. 156) | — | — | — | — | — |
| P-3m1 (No. 164) | — | — | — | — | — |
Applications
Where K2Na2O8S2 is used.
Frequently Asked Questions
Common questions about K2Na2O8S2, answered from cross-validated data.
What is K2Na2O8S2?
K2Na2O8S2 is a stable, wide-gap insulating inorganic compound composed of potassium, sodium, oxygen, and sulfur.
What is K2Na2O8S2 used for?
What is the band gap of K2Na2O8S2?
Is K2Na2O8S2 a metal, semiconductor, or insulator?
Is K2Na2O8S2 thermodynamically stable?
What is the crystal structure of K2Na2O8S2?
What is the density of K2Na2O8S2?
How many polymorphs of K2Na2O8S2 are known?
What elements does K2Na2O8S2 contain?
Where does the data for K2Na2O8S2 come from?
How It Compares
As a standalone entry in this specific classification, K2Na2O8S2 serves as a foundational reference point for understanding the structural diversity of complex alkali metal sulfates. Its near-hull stability distinguishes it as a viable target for experimental verification compared to more metastable configurations.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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