CoRh3
CoRh3 is a metallic, metastable alloy of cobalt and rhodium used primarily in fundamental research on platinum-group catalytic materials.
About CoRh3
CoRh3 is a metallic alloy composed of cobalt and rhodium that falls within the family of platinum-group catalysts. As a metastable phase, it represents a specialized structural configuration that researchers study to understand the interplay between transition metal bonding and catalytic activity.
Its metallic nature ensures high electrical conductivity, which is a critical feature for materials intended for electrochemical applications. The extensive structural data available for this compound underscores its significance as a subject of interest for fundamental materials science research into alloy stability.
Key Properties
Cross-validated computational properties for CoRh3, 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 CoRh3, 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. |
|---|---|---|---|---|---|
| Pm-3m (No. 221) | cubic | 0.00 | 0.0655 | -21.345 | 11.43 |
| I4/mmm (No. 139) | — | — | — | — | — |
| P4/mmm (No. 123) | — | — | — | — | — |
| Pm-3m (No. 221) | — | — | — | — | — |
| P1 (No. 1) | Triclinic | — | — | — | 11.10 |
| Pm-3m (No. 221) | Cubic | — | — | — | 11.43 |
| Cm (No. 8) | Monoclinic | — | — | — | 9.96 |
| R3m (No. 160) | Trigonal | — | — | — | 10.20 |
| — | — | — | — | — | 11.44 |
| — | — | — | — | — | 11.44 |
| Pm-3m (No. 221) | Cubic | — | — | — | 12.67 |
| Pm-3m (No. 221) | Cubic | — | — | — | 11.80 |
Applications
Where CoRh3 is used.
Frequently Asked Questions
Common questions about CoRh3, answered from cross-validated data.
What is CoRh3?
CoRh3 is a metallic, metastable alloy of cobalt and rhodium used primarily in fundamental research on platinum-group catalytic materials.
What is CoRh3 used for?
What is the band gap of CoRh3?
Is CoRh3 a metal, semiconductor, or insulator?
Is CoRh3 thermodynamically stable?
What is the crystal structure of CoRh3?
What is the density of CoRh3?
How many polymorphs of CoRh3 are known?
What elements does CoRh3 contain?
Where does the data for CoRh3 come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse group of platinum-group alloy catalysts, CoRh3 occupies a distinct niche compared to compounds like LaRh or GeRu. While many of its peers exhibit varied structural symmetries and thermodynamic profiles, CoRh3 is characterized by its specific metastable state, distinguishing it from more robustly stable intermetallic phases found elsewhere in the class.
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).
- nomad — Data from NOMAD. Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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