InS
indium monosulfide · indium(II) sulfide
Indium monosulfide is a thermodynamically stable semiconducting compound composed of indium and sulfur.
About indium monosulfide
Indium monosulfide is a thermodynamically stable binary compound that occupies a position on the convex hull of the indium-sulfur system. Its nature as a semiconductor makes it an intriguing subject for research into electronic materials that require specific charge transport characteristics.
With a significant number of reported structures across various databases, this material is well-characterized in the scientific literature. Its stability and electronic behavior suggest it is a robust candidate for fundamental studies in solid-state physics and material engineering.
Key Properties
Cross-validated computational properties for indium monosulfide, aggregated across 6 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 InS. 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 InS, 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. |
|---|---|---|---|---|---|
| Pnnm (No. 58) | orthorhombic | 1.35 | 0.0000 | -15.990 | 4.92 |
| — | — | 1.12 | 0.0000 | -0.677 | — |
| Pnnm (No. 58) | orthorhombic | 1.04 | 0.0000 | -0.584 | — |
| Pnnm (No. 58) | orthorhombic | 1.02 | 0.0005 | -0.583 | — |
| Pnnm (No. 58) | orthorhombic | 0.91 | 0.0022 | -0.582 | — |
| P-1 (No. 2) | triclinic | 1.12 | 0.0143 | -0.570 | — |
| — | — | 1.24 | 0.0244 | -0.653 | — |
| P21/c (No. 14) | monoclinic | 0.34 | 0.0278 | -15.962 | 5.18 |
| — | — | 0.57 | 0.0458 | -0.632 | — |
| — | — | 0.00 | 0.1288 | -0.549 | — |
| — | — | 0.00 | 0.1290 | -0.548 | — |
| — | — | 0.00 | 0.2272 | -0.450 | — |
Applications
Where indium monosulfide is used.
Frequently Asked Questions
Common questions about indium monosulfide, answered from cross-validated data.
What is InS?
Indium monosulfide is a thermodynamically stable semiconducting compound composed of indium and sulfur.
What is InS used for?
What is the band gap of InS?
Is InS a metal, semiconductor, or insulator?
Is InS thermodynamically stable?
What is the crystal structure of InS?
What is the density of InS?
How many polymorphs of InS are known?
What elements does InS contain?
Where does the data for InS come from?
How It Compares
As a stable binary semiconductor, indium monosulfide serves as a foundational reference point for understanding the behavior of indium-based chalcogenides. It represents a key phase in the indium-sulfur landscape, providing a baseline for comparing the structural and electronic evolution of more complex indium-sulfur compounds.
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)
- 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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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