Al4Bi2O9
Al4Bi2O9 is a thermodynamically stable semiconducting complex oxide used in catalytic research.
About Al4Bi2O9
Al4Bi2O9 is a complex oxide composed of aluminum, bismuth, and oxygen that exists as a thermodynamically stable phase on the convex hull. Its semiconducting electronic character makes it an intriguing candidate for specialized catalytic processes where precise electronic control is required. The material is characterized by a high degree of structural diversity, with multiple reported configurations across major materials databases. This structural flexibility suggests potential for fine-tuning its performance in diverse chemical environments. As a member of the broader class of complex oxides, it serves as a robust platform for investigating the interplay between bismuth-based coordination and aluminum-oxide frameworks in catalytic cycles.
Key Properties
Cross-validated computational properties for Al4Bi2O9, 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.
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.
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.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for Al4Bi2O9, 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. |
|---|---|---|---|---|---|
| Pbam (No. 55) | orthorhombic | 2.80 | 0.0000 | -7.344 | 6.24 |
| Pbam (No. 55) | Orthorhombic | — | — | — | 6.01 |
| Pbam (No. 55) | Orthorhombic | — | — | — | 6.41 |
| Pbam (No. 55) | Orthorhombic | — | — | — | 6.19 |
| Pbam (No. 55) | — | — | — | — | — |
Applications
Where Al4Bi2O9 is used.
Frequently Asked Questions
Common questions about Al4Bi2O9, answered from cross-validated data.
What is Al4Bi2O9?
Al4Bi2O9 is a thermodynamically stable semiconducting complex oxide used in catalytic research.
What is Al4Bi2O9 used for?
What is the band gap of Al4Bi2O9?
Is Al4Bi2O9 a metal, semiconductor, or insulator?
Is Al4Bi2O9 thermodynamically stable?
What is the crystal structure of Al4Bi2O9?
What is the density of Al4Bi2O9?
How many polymorphs of Al4Bi2O9 are known?
What elements does Al4Bi2O9 contain?
Where does the data for Al4Bi2O9 come from?
How It Compares
Within the spinel oxide catalysts class.
Unlike the simple binary oxides in its class such as Al2O3 or ZnO, which are often used for their structural simplicity or wide-gap insulation, Al4Bi2O9 offers a more complex ternary framework. It shares the landscape of advanced catalytic materials with perovskite-structured siblings like LaAlO3 and LaMnO3, yet it occupies a distinct structural niche that differentiates it from the classic spinel MgAl2O4, providing a unique alternative for researchers seeking specific electronic properties in complex metal-oxide catalysts.
Related Compounds
Other Spinel Oxide Catalysts 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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