K2La2S8Si2
K2La2S8Si2 is a stable, semiconducting quaternary sulfide compound containing potassium, lanthanum, sulfur, and silicon.
About K2La2S8Si2
K2La2S8Si2 is a quaternary sulfide compound composed of potassium, lanthanum, sulfur, and silicon. As a thermodynamically stable phase residing on the convex hull, it represents a robust crystalline architecture within its chemical system. Its electronic character is defined as semiconducting, making it a subject of interest for researchers investigating complex chalcogenide frameworks. The compound is supported by multiple reported structures across major materials databases, highlighting its significance in solid-state chemistry. It serves as an important model for understanding how rare-earth elements and silicon interact within sulfur-rich environments to create stable, functional electronic materials.
Key Properties
Cross-validated computational properties for K2La2S8Si2, 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 K2La2S8Si2, 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. |
|---|---|---|---|---|---|
| P21 (No. 4) | monoclinic | 2.87 | 0.0000 | -12.647 | 3.02 |
| P21/m (No. 11) | monoclinic | 2.69 | 0.0024 | -12.644 | 2.97 |
| — | — | — | — | — | 2.94 |
| P21 (No. 4) | — | — | — | — | — |
| P21/m (No. 11) | — | — | — | — | — |
Applications
Where K2La2S8Si2 is used.
Frequently Asked Questions
Common questions about K2La2S8Si2, answered from cross-validated data.
What is K2La2S8Si2?
K2La2S8Si2 is a stable, semiconducting quaternary sulfide compound containing potassium, lanthanum, sulfur, and silicon.
What is K2La2S8Si2 used for?
What is the band gap of K2La2S8Si2?
Is K2La2S8Si2 a metal, semiconductor, or insulator?
Is K2La2S8Si2 thermodynamically stable?
What is the crystal structure of K2La2S8Si2?
What is the density of K2La2S8Si2?
How many polymorphs of K2La2S8Si2 are known?
What elements does K2La2S8Si2 contain?
Where does the data for K2La2S8Si2 come from?
How It Compares
As a unique quaternary sulfide, K2La2S8Si2 occupies a distinct niche in materials science. Without direct structural siblings in this specific chemical family, it serves as a foundational reference point for exploring the electronic and structural trends of lanthanum-based silicon sulfides.
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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