Al1K1Se2
Al1K1Se2 is a stable semiconducting ternary chalcogenide compound.
About Al1K1Se2
Al1K1Se2 is a ternary chalcogenide that exists as a thermodynamically stable phase on the convex hull. Its electronic character as a semiconductor makes it an intriguing candidate for specialized optoelectronic and solid-state applications where precise band structure control is required.
With a significant number of reported structures, this material represents a well-characterized system within the broader landscape of aluminum-potassium selenides. Its stability suggests potential for synthesis and integration into functional device architectures.
Key Properties
Cross-validated computational properties for Al1K1Se2, aggregated across 2 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 Al1K1Se2, 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. |
|---|---|---|---|---|---|
| C2/c (No. 15) | monoclinic | 2.42 | 0.0000 | -4.345 | 3.28 |
| C2/m (No. 12) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| Cmmm (No. 65) | — | — | — | — | — |
| Immm (No. 71) | — | — | — | — | — |
| R3m (No. 160) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
| Imm2 (No. 44) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| Cm (No. 8) | — | — | — | — | — |
Applications
Where Al1K1Se2 is used.
Frequently Asked Questions
Common questions about Al1K1Se2, answered from cross-validated data.
What is Al1K1Se2?
Al1K1Se2 is a stable semiconducting ternary chalcogenide compound.
What is Al1K1Se2 used for?
What is the band gap of Al1K1Se2?
Is Al1K1Se2 a metal, semiconductor, or insulator?
Is Al1K1Se2 thermodynamically stable?
What is the crystal structure of Al1K1Se2?
What is the density of Al1K1Se2?
How many polymorphs of Al1K1Se2 are known?
What elements does Al1K1Se2 contain?
Where does the data for Al1K1Se2 come from?
How It Compares
As a distinct ternary compound, Al1K1Se2 occupies a unique position in the materials landscape, serving as a foundational example of stable aluminum-based chalcogenides that warrant further investigation for their electronic properties.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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