CoRh
CoRh is a metallic, metastable alloy of cobalt and rhodium used primarily in advanced catalytic research.
About CoRh
CoRh is a metallic alloy composed of cobalt and rhodium, belonging to the specialized class of platinum-group catalysts. As a metastable material, it represents a complex structural arrangement that is of significant interest for researchers investigating catalytic surface interactions and phase stability. Its metallic nature ensures high electrical conductivity, which is a hallmark of this alloy group.
The compound is frequently studied for its role in surface science and heterogeneous catalysis. Because it exists in a metastable state, it offers unique opportunities to explore phase transitions and surface reactivity that are distinct from more stable, bulk-phase counterparts. It is primarily utilized in high-performance catalytic applications where specific electronic configurations are required to facilitate complex chemical transformations.
Key Properties
Cross-validated computational properties for CoRh, aggregated across 6 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CoRh. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for CoRh, 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. |
|---|---|---|---|---|---|
| R-3m (No. 166) | trigonal | 0.00 | 0.0824 | -18.603 | 10.32 |
| P1 (No. 1) | Triclinic | — | — | — | 6.84 |
| Pmmn (No. 59) | Orthorhombic | — | — | — | 11.44 |
| P-1 (No. 2) | Triclinic | — | — | — | 9.24 |
| R3m (No. 160) | Trigonal | — | — | — | 11.39 |
| P21/m (No. 11) | Monoclinic | — | — | — | 11.00 |
| R3m (No. 160) | Trigonal | — | — | — | 10.36 |
| R3m (No. 160) | Trigonal | — | — | — | 11.55 |
| R-3m (No. 166) | Trigonal | — | — | — | 10.98 |
| P-1 (No. 2) | Triclinic | — | — | — | 9.34 |
| P21/m (No. 11) | Monoclinic | — | — | — | 10.91 |
| P1 (No. 1) | Triclinic | — | — | — | 4.30 |
Applications
Where CoRh is used.
Frequently Asked Questions
Common questions about CoRh, answered from cross-validated data.
What is CoRh?
CoRh is a metallic, metastable alloy of cobalt and rhodium used primarily in advanced catalytic research.
What is CoRh used for?
What is the band gap of CoRh?
Is CoRh a metal, semiconductor, or insulator?
Is CoRh thermodynamically stable?
What is the crystal structure of CoRh?
What is the density of CoRh?
How many polymorphs of CoRh are known?
What elements does CoRh contain?
Where does the data for CoRh come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse family of platinum-group alloys, CoRh occupies a distinct space compared to more common intermetallics like LaRh. While many members of this class exhibit varying degrees of thermodynamic stability, CoRh is notable for its metastable nature, which sets it apart from more robust, stable phases found in the broader group of transition metal alloys.
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).
- mpaloe — Data from mpaloe.
- 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).
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