Nb4Al
Nb4Al has a DFT band gap of Metallic / not reported across 8 reported structures in 4 space groups; its lowest-energy polymorph is orthorhombic (Fmmm (No. 69)). Cross-validated across 3 computational databases.
Overview
Key Properties
Cross-validated computational properties for Nb4Al, aggregated across 3 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.
0.104 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.
Above hull
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
8
3 databases, 4 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for Nb4Al, 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. |
|---|---|---|---|---|---|
| Fmmm (No. 69) | orthorhombic | 0.00 | 0.1045 | -21.237 | 7.41 |
| Fmmm (No. 69) | Orthorhombic | — | — | — | 7.41 |
| Fmmm (No. 69) | Orthorhombic | — | — | — | 7.53 |
| Fmmm (No. 69) | Orthorhombic | — | — | — | 7.48 |
| P2/m (No. 10) | Monoclinic | — | — | — | 5.87 |
| P-1 (No. 2) | Triclinic | — | — | — | 7.25 |
| C2/m (No. 12) | Monoclinic | — | — | — | 6.75 |
| Fmmm (No. 69) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about Nb4Al, answered from cross-validated data.
What is the band gap of Nb4Al?
Nb4Al is computed to be metallic (no band gap) in the reported DFT structures.
More questions
Is Nb4Al a metal, semiconductor, or insulator?
Computed band structures report no gap, so it is metallic.
Is Nb4Al thermodynamically stable?
Nb4Al has a lowest energy above hull of 0.104 eV/atom (above hull).
What is the crystal structure of Nb4Al?
The lowest-energy reported polymorph of Nb4Al is orthorhombic symmetry, space group Fmmm (No. 69).
What is the density of Nb4Al?
The computed density of the ground-state structure of Nb4Al is 7.41 g/cm³.
How many polymorphs of Nb4Al are known?
8 structures of Nb4Al are reported across 3 databases, spanning 4 distinct space groups.
What elements does Nb4Al contain?
Nb4Al contains Al and Nb (2 elements).
Where does the data for Nb4Al come from?
Nb4Al data is cross-referenced from materials_project, mpaloe, jarvis.
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Related Compounds
Other A15 Superconductors 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.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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