Al2Co1Rh1
Al2Co1Rh1 is a semimetallic, metastable intermetallic alloy composed of aluminum, cobalt, and rhodium, primarily studied for its potential in catalytic applications.
About Al2Co1Rh1
Al2Co1Rh1 is a complex intermetallic compound categorized within the platinum-group alloy catalysts. Characterized by its near-zero-gap electronic structure, this material exhibits semimetallic behavior that distinguishes its charge carrier dynamics from typical insulating or fully metallic alloys.
While the compound shows significant structural diversity with numerous reported phases, its position above the thermodynamic hull suggests it is a metastable material. This inherent instability makes it a subject of interest for researchers studying phase formation and the kinetic pathways of catalytic alloy synthesis.
Key Properties
Cross-validated computational properties for Al2Co1Rh1, 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.
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 Al2Co1Rh1, 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. |
|---|---|---|---|---|---|
| Immm (No. 71) | orthorhombic | 0.07 | 3.0220 | -10.554 | 0.57 |
| R-3m (No. 166) | — | — | — | — | — |
| Pmm2 (No. 25) | — | — | — | — | — |
| C2/m (No. 12) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| P2/m (No. 10) | — | — | — | — | — |
| R3m (No. 160) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| P4mm (No. 99) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
Applications
Where Al2Co1Rh1 is used.
Frequently Asked Questions
Common questions about Al2Co1Rh1, answered from cross-validated data.
What is Al2Co1Rh1?
Al2Co1Rh1 is a semimetallic, metastable intermetallic alloy composed of aluminum, cobalt, and rhodium, primarily studied for its potential in catalytic applications.
What is Al2Co1Rh1 used for?
What is the band gap of Al2Co1Rh1?
Is Al2Co1Rh1 a metal, semiconductor, or insulator?
Is Al2Co1Rh1 thermodynamically stable?
What is the crystal structure of Al2Co1Rh1?
What is the density of Al2Co1Rh1?
How many polymorphs of Al2Co1Rh1 are known?
What elements does Al2Co1Rh1 contain?
Where does the data for Al2Co1Rh1 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse family of platinum-group alloys, Al2Co1Rh1 occupies a unique niche compared to more stable, well-characterized siblings like LaRh or GeRu. Unlike these more robust intermetallics, Al2Co1Rh1 represents a metastable configuration that highlights the complex interplay between transition metals and aluminum in forming specialized catalytic surfaces.
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).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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