Ag4As2S4
Ag4As2S4 is a semiconducting silver arsenic sulfide compound that is theoretically stable and potentially synthesizable for material science research.
About Ag4As2S4
Ag4As2S4 is a complex sulfide compound composed of silver, arsenic, and sulfur. As a semiconducting material, it exhibits electronic properties that make it a subject of interest for researchers exploring chalcogenide-based functional materials.
Being classified as a near-hull phase, this compound is considered thermodynamically accessible and likely synthesizable under controlled laboratory conditions. Its structural characteristics suggest potential utility in specialized electronic or sensing components where specific sulfide-based semiconductor behavior is required.
Key Properties
Cross-validated computational properties for Ag4As2S4, 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 Ag4As2S4, 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. |
|---|---|---|---|---|---|
| Pc (No. 7) | monoclinic | 0.53 | 0.0030 | -14.844 | 5.35 |
| — | — | — | — | — | 4.89 |
| No. 0 | unknown | — | — | — | 2.80 |
Applications
Where Ag4As2S4 is used.
Frequently Asked Questions
Common questions about Ag4As2S4, answered from cross-validated data.
What is Ag4As2S4?
Ag4As2S4 is a semiconducting silver arsenic sulfide compound that is theoretically stable and potentially synthesizable for material science research.
What is Ag4As2S4 used for?
What is the band gap of Ag4As2S4?
Is Ag4As2S4 a metal, semiconductor, or insulator?
Is Ag4As2S4 thermodynamically stable?
What is the crystal structure of Ag4As2S4?
What is the density of Ag4As2S4?
How many polymorphs of Ag4As2S4 are known?
What elements does Ag4As2S4 contain?
Where does the data for Ag4As2S4 come from?
How It Compares
As a member of the silver arsenic sulfide family, Ag4As2S4 occupies a unique niche within this group of chalcogenides. While many related compounds are well-characterized for their mineralogical significance or specific optical properties, this particular stoichiometry represents a distinct structural arrangement that contributes to the broader understanding of phase stability in the Ag-As-S system.
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).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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