As4Ir2
As4Ir2 has a DFT band gap of 0.82 eV across 23 reported structures in 11 space groups; its lowest-energy polymorph is monoclinic (P21/c (No. 14)). Cross-validated across 4 computational databases.
At a glance
Key Properties
Cross-validated computational properties for As4Ir2, aggregated across 4 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.
0.82 eV
Range across DFT structures
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.
0.000 eV/atom
Best (lowest) across sources
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.
On hull (stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
23
4 databases, 11 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for As4Ir2, 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/c (No. 14) | monoclinic | 0.82 | 0.0000 | -27.829 | 10.71 |
| P63/mmc (No. 194) | — | — | — | — | — |
| — | — | — | — | — | 10.85 |
| — | — | — | — | — | 10.85 |
| No. 0 | unknown | — | — | — | 2.73 |
| Imma (No. 74) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| Fd-3m (No. 227) | — | — | — | — | — |
| Cm (No. 8) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about As4Ir2, answered from cross-validated data.
What is the band gap of As4Ir2?
As4Ir2 has a DFT-computed band gap of 0.82 eV across 23 reported structures.
More questions
Is As4Ir2 a metal, semiconductor, or insulator?
With a band gap up to 0.82 eV it is a semiconductor.
Is As4Ir2 thermodynamically stable?
Yes — As4Ir2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of As4Ir2?
The lowest-energy reported polymorph of As4Ir2 is monoclinic symmetry, space group P21/c (No. 14).
What is the density of As4Ir2?
The computed density of the ground-state structure of As4Ir2 is 10.71 g/cm³.
How many polymorphs of As4Ir2 are known?
23 structures of As4Ir2 are reported across 4 databases, spanning 11 distinct space groups.
What elements does As4Ir2 contain?
As4Ir2 contains As and Ir (2 elements).
Where does the data for As4Ir2 come from?
As4Ir2 data is cross-referenced from materials_project, aflow, omat24, cod.
Explore
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
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).
- 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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