Al2C2Cr4
Al2C2Cr4 has a DFT band gap of Metallic / not reported across 3 reported structures in 1 space group; its lowest-energy polymorph is hexagonal (P63/mmc (No. 194)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for Al2C2Cr4, 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.
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)
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
3
2 databases, 1 space group
Crystallography
Reported Structures
Lowest-energy structures reported for Al2C2Cr4, 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. |
|---|---|---|---|---|---|
| P63/mmc (No. 194) | hexagonal | 0.00 | 0.0000 | -8.243 | 5.45 |
| P63/mmc (No. 194) | — | — | — | — | — |
| P63/mmc (No. 194) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about Al2C2Cr4, answered from cross-validated data.
What is the band gap of Al2C2Cr4?
Al2C2Cr4 is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is Al2C2Cr4 a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is Al2C2Cr4 thermodynamically stable?
Yes — Al2C2Cr4 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of Al2C2Cr4?
The lowest-energy reported polymorph of Al2C2Cr4 is hexagonal symmetry, space group P63/mmc (No. 194).
What is the density of Al2C2Cr4?
The computed density of the ground-state structure of Al2C2Cr4 is 5.45 g/cm³.
How many polymorphs of Al2C2Cr4 are known?
3 structures of Al2C2Cr4 are reported across 2 databases, spanning 1 distinct space group.
What elements does Al2C2Cr4 contain?
Al2C2Cr4 contains Al, C, and Cr (3 elements).
Where does the data for Al2C2Cr4 come from?
Al2C2Cr4 data is cross-referenced from materials_project, aflow.
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Related Compounds
Other MAX Phases 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).
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