AlN4
AlN4 has a DFT band gap of Metallic / not reported across 34 reported structures in 10 space groups; its lowest-energy polymorph is Monoclinic (C2/m (No. 12)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for AlN4, 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.
Metallic / not reported
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.
—
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.
Not assessed
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
34
2 databases, 10 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for AlN4, 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/m (No. 12) | Monoclinic | — | — | — | 2.58 |
| I4/mmm (No. 139) | Tetragonal | — | — | — | 3.30 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.61 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.14 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.02 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.02 |
| P1 (No. 1) | Triclinic | — | — | — | 2.21 |
| P1 (No. 1) | Triclinic | — | — | — | 2.04 |
| P1 (No. 1) | Triclinic | — | — | — | 2.09 |
| P1 (No. 1) | Triclinic | — | — | — | 2.66 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.56 |
| Cm (No. 8) | Monoclinic | — | — | — | 2.53 |
Reference
Frequently Asked Questions
Common questions about AlN4, answered from cross-validated data.
What is the band gap of AlN4?
AlN4 is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is AlN4 a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
What is the crystal structure of AlN4?
The lowest-energy reported polymorph of AlN4 is Monoclinic symmetry, space group C2/m (No. 12).
What is the density of AlN4?
The computed density of the ground-state structure of AlN4 is 2.58 g/cm³.
How many polymorphs of AlN4 are known?
34 structures of AlN4 are reported across 2 databases, spanning 10 distinct space groups.
What elements does AlN4 contain?
AlN4 contains Al and N (2 elements).
Where does the data for AlN4 come from?
AlN4 data is cross-referenced from mpaloe, omat24.
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Related Compounds
Other III-V Semiconductors in the database.
Data sources & attribution
- mpaloe — Data from mpaloe.
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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