Al2CuO4
Al2CuO4 has a DFT band gap of Metallic / not reported across 36 reported structures in 5 space groups; its reference structure is cubic (Fd-3m (No. 227)). Cross-validated across 5 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Al2CuO4, aggregated across 5 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.
0.057 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.
Metastable
3 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
36
5 databases, 5 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Al2CuO4. 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.
0.90 / 1.00
Trust tier: high
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.025 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
3
jarvis, materials_project, oqmd
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Mixed (most: Fd-3m (No. 227))
Crystallography
Reported Structures
Lowest-energy structures reported for Al2CuO4, 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. |
|---|---|---|---|---|---|
| Cm (No. 8) | monoclinic | 0.00 | 0.0575 | -7.143 | 4.45 |
| P3m1 (No. 156) | trigonal | 0.00 | 0.0593 | -7.141 | 4.45 |
| R3m (No. 160) | trigonal | 0.00 | 0.0623 | -7.138 | 4.45 |
| Fd-3m (No. 227) | cubic | 0.00 | 0.0630 | -7.137 | 4.60 |
| Fd-3m (No. 227) | cubic | 0.00 | 0.0694 | -2.506 | — |
| Fd-3m (No. 227) | cubic | 0.00 | 0.0694 | -2.506 | — |
| Cm (No. 8) | monoclinic | 0.00 | 0.0729 | -7.127 | 4.45 |
| — | — | 0.00 | 0.0828 | -2.487 | — |
| — | — | 0.00 | 0.0832 | -2.487 | — |
| — | — | 0.00 | 0.0842 | -2.486 | — |
| Imma (No. 74) | orthorhombic | 0.00 | 0.0958 | -7.104 | 4.47 |
| Imma (No. 74) | orthorhombic | 0.00 | 0.1048 | -2.471 | — |
Synthesis
Synthesis Routes
Literature-extracted synthesis procedures targeting Al2CuO4.
Sol Gel
Procedure available · ceder_sol_gel
Sol Gel
Procedure available · ceder_sol_gel
Sol Gel
Procedure available · ceder_sol_gel
Sol Gel
Procedure available · ceder_sol_gel
Sol Gel
Procedure available · ceder_sol_gel
Solid State
Procedure available · ceder_solid_state
Reference
Frequently Asked Questions
Common questions about Al2CuO4, answered from cross-validated data.
What is the band gap of Al2CuO4?
The reported DFT structures of Al2CuO4 show no band gap. Standard DFT often misses gaps (especially in transition-metal oxides), so this is not proof the real material is a metal.
More questions
Is Al2CuO4 a metal, semiconductor, or insulator?
DFT calculations predict no band gap. Standard DFT can miss gaps, so measurements are needed to confirm metallic behavior.
Is Al2CuO4 thermodynamically stable?
Al2CuO4 has a lowest energy above hull of 0.057 eV/atom (metastable).
What is the crystal structure of Al2CuO4?
The reference structure of Al2CuO4 is cubic symmetry, space group Fd-3m (No. 227).
What is the density of Al2CuO4?
The computed density of the ground-state structure of Al2CuO4 is 4.60 g/cm³.
How many polymorphs of Al2CuO4 are known?
36 structures of Al2CuO4 are reported across 5 databases, spanning 5 distinct space groups.
How is Al2CuO4 synthesized?
Literature-reported routes for Al2CuO4 include sol gel, solid state (10 procedures documented).
What elements does Al2CuO4 contain?
Al2CuO4 contains Al, Cu, and O (3 elements).
Where does the data for Al2CuO4 come from?
Al2CuO4 data is cross-referenced from materials_project, jarvis, oqmd, cod, mpaloe.
Explore
Related Compounds
Other Spinel Oxide Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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