K2S3
K2S3 is a thermodynamically stable semiconducting compound formed from potassium and sulfur.
About K2S3
K2S3 is a thermodynamically stable inorganic compound composed of potassium and sulfur. As a member of the alkali metal polysulfide family, it occupies a position on the convex hull, indicating robust structural stability under standard conditions.
This material exhibits semiconducting electronic character, making it an interesting subject for fundamental research into sulfur-rich ionic conductors. With numerous reported structures across multiple databases, it is a well-documented phase in the potassium-sulfur system.
Key Properties
Cross-validated computational properties for K2S3, aggregated across 5 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 K2S3. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for K2S3, 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. |
|---|---|---|---|---|---|
| Cmc21 (No. 36) | orthorhombic | 1.34 | 0.0000 | -0.943 | — |
| — | — | 1.32 | 0.0000 | -0.968 | — |
| Cmc21 (No. 36) | orthorhombic | 1.31 | 0.0000 | -8.173 | 2.13 |
| — | — | 0.00 | 0.5531 | -0.415 | — |
| P1 (No. 1) | triclinic | — | — | — | 1.89 |
| C2/m (No. 12) | monoclinic | — | — | — | 1.66 |
| P-1 (No. 2) | triclinic | — | — | — | 2.10 |
| P-1 (No. 2) | triclinic | — | — | — | 0.93 |
| P-1 (No. 2) | triclinic | — | — | — | 0.83 |
| C2/m (No. 12) | monoclinic | — | — | — | 2.03 |
| C2/m (No. 12) | monoclinic | — | — | — | 1.54 |
| C2/m (No. 12) | monoclinic | — | — | — | 2.01 |
Frequently Asked Questions
Common questions about K2S3, answered from cross-validated data.
What is K2S3?
K2S3 is a thermodynamically stable semiconducting compound formed from potassium and sulfur.
What is the band gap of K2S3?
Is K2S3 a metal, semiconductor, or insulator?
Is K2S3 thermodynamically stable?
What is the crystal structure of K2S3?
How many polymorphs of K2S3 are known?
What elements does K2S3 contain?
Where does the data for K2S3 come from?
How It Compares
As a stable binary sulfide, K2S3 represents a foundational point in the landscape of alkali metal chalcogenides, serving as a primary reference for understanding the structural diversity of sulfur-rich potassium compounds.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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