AlAs
Aluminum arsenide · AlAs
Aluminum arsenide is a semiconductor material composed of aluminum and arsenic. It is primarily utilized in the fabrication of optoelectronic devices and high-speed electronic components due to its favorable electronic properties.
Key Properties
Cross-validated computational properties for Aluminum arsenide, 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 AlAs. 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 AlAs, 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. |
|---|---|---|---|---|---|
| F-43m (No. 216) | cubic | 1.50 | 0.0000 | -11.347 | 3.70 |
| P63mc (No. 186) | hexagonal | 1.69 | 0.0074 | -11.339 | 3.71 |
| Pa-3 (No. 205) | cubic | 1.19 | 0.1498 | -11.197 | 3.91 |
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.2483 | -11.099 | 4.55 |
| Fm-3m (No. 225) | cubic | 0.00 | 0.2764 | -11.070 | 4.55 |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.6253 | -10.722 | 4.26 |
| P21/m (No. 11) | Monoclinic | — | — | — | 5.63 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.39 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 3.13 |
| P21 (No. 4) | Monoclinic | — | — | — | 3.81 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.63 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.08 |
Applications
Where Aluminum arsenide is used.
Frequently Asked Questions
Common questions about Aluminum arsenide, answered from cross-validated data.
What is AlAs?
Aluminum arsenide is a semiconductor material composed of aluminum and arsenic. It is primarily utilized in the fabrication of optoelectronic devices and high-speed electronic components due to its favorable electronic properties.
What is AlAs used for?
What is the band gap of AlAs?
Is AlAs a metal, semiconductor, or insulator?
Is AlAs thermodynamically stable?
What is the crystal structure of AlAs?
What is the density of AlAs?
How many polymorphs of AlAs are known?
What elements does AlAs contain?
Where does the data for AlAs come from?
Related Compounds
Other III-V Semiconductors in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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