GeRh
GeRh is a thermodynamically stable, metallic intermetallic compound composed of germanium and rhodium that is primarily investigated for its potential in catalytic applications.
About GeRh
GeRh is a metallic intermetallic compound belonging to the platinum-group alloy catalyst class. As a thermodynamically stable phase residing on the convex hull, it demonstrates structural robustness that makes it a subject of significant interest in materials science research. Its metallic nature suggests high electrical conductivity, which is a critical trait for catalytic applications involving electron transfer. The compound is supported by extensive structural data, reflecting its well-characterized nature across multiple databases. It serves as a key example of how germanium and rhodium can combine to form stable, ordered intermetallic phases that are potentially useful in specialized chemical processes. Its stability and electronic properties make it a candidate for studies focused on surface reactivity and catalytic efficiency.
Key Properties
Cross-validated computational properties for GeRh, 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 GeRh. 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 GeRh, 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. |
|---|---|---|---|---|---|
| Pnma (No. 62) | orthorhombic | 0.00 | 0.0000 | -19.566 | 9.66 |
| Pnma (No. 62) | orthorhombic | 0.00 | 0.0000 | -0.500 | — |
| — | — | 0.00 | 0.0000 | -0.555 | — |
| — | — | 0.00 | 0.0391 | -0.516 | — |
| P213 (No. 198) | cubic | 0.00 | 0.0616 | -0.438 | — |
| P213 (No. 198) | cubic | 0.00 | 0.0662 | -19.500 | 9.86 |
| — | — | 0.00 | 0.1523 | -0.403 | — |
| — | — | 0.00 | 0.1917 | -0.364 | — |
| — | — | 0.00 | 0.2369 | -0.318 | — |
| — | — | 0.00 | 0.2429 | -0.313 | — |
| — | — | 0.00 | 0.4087 | -0.147 | — |
| — | — | 0.00 | 0.5243 | -0.031 | — |
Applications
Where GeRh is used.
Frequently Asked Questions
Common questions about GeRh, answered from cross-validated data.
What is GeRh?
GeRh is a thermodynamically stable, metallic intermetallic compound composed of germanium and rhodium that is primarily investigated for its potential in catalytic applications.
What is GeRh used for?
What is the band gap of GeRh?
Is GeRh a metal, semiconductor, or insulator?
Is GeRh thermodynamically stable?
What is the crystal structure of GeRh?
What is the density of GeRh?
How many polymorphs of GeRh are known?
What elements does GeRh contain?
Where does the data for GeRh come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse family of platinum-group alloys, GeRh stands out for its thermodynamic stability compared to more complex or metastable phases like As2Ir or Ga2Ru. While many members of this class, such as GeRu, are studied for their specific catalytic pathways, GeRh offers a distinct electronic environment due to the unique combination of rhodium with germanium, positioning it as a reliable baseline material for comparative studies of intermetallic catalysts.
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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