Al5Rh2
Al5Rh2 is a stable intermetallic alloy of aluminum and rhodium used primarily in catalytic research.
About Al5Rh2
Al5Rh2 is a robust intermetallic compound belonging to the class of platinum-group alloy catalysts. As a metallic phase, it exhibits high structural integrity and is characterized by its position on the thermodynamic convex hull, indicating exceptional stability under standard conditions.
This material is of significant interest in catalysis research due to the synergistic interaction between aluminum and rhodium. Its stable crystalline architecture allows it to serve as a durable platform for chemical transformations, often outperforming pure elemental catalysts in specific industrial applications.
Key Properties
Cross-validated computational properties for Al5Rh2, 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.
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 Al5Rh2, 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 | -12.511 | 5.35 |
| P63/mmc (No. 194) | — | — | — | — | — |
| P63/mmc (No. 194) | Hexagonal | — | — | — | 5.23 |
| P63/mmc (No. 194) | Hexagonal | — | — | — | 5.50 |
| P63/mmc (No. 194) | Hexagonal | — | — | — | 5.36 |
| — | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.83 |
| C2/m (No. 12) | Monoclinic | — | — | — | 7.48 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.60 |
Applications
Where Al5Rh2 is used.
Frequently Asked Questions
Common questions about Al5Rh2, answered from cross-validated data.
What is Al5Rh2?
Al5Rh2 is a stable intermetallic alloy of aluminum and rhodium used primarily in catalytic research.
What is Al5Rh2 used for?
What is the band gap of Al5Rh2?
Is Al5Rh2 a metal, semiconductor, or insulator?
Is Al5Rh2 thermodynamically stable?
What is the crystal structure of Al5Rh2?
What is the density of Al5Rh2?
How many polymorphs of Al5Rh2 are known?
What elements does Al5Rh2 contain?
Where does the data for Al5Rh2 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse family of platinum-group alloy catalysts, Al5Rh2 distinguishes itself through its high thermodynamic stability compared to more volatile or reactive counterparts like BaPd or GeRu. While many members of this class are explored for their specific electronic band structures, Al5Rh2 remains a reliable metallic benchmark for structural consistency in catalytic studies.
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
- alexandria — Data from alexandria.
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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