CoGe
CoGe is a thermodynamically stable metallic compound formed from cobalt and germanium.
About CoGe
CoGe is a metallic binary intermetallic compound composed of cobalt and germanium. It is recognized for its thermodynamic stability, sitting directly on the convex hull, which indicates a robust structural configuration under standard conditions. The material is characterized by its metallic electronic nature, lacking a band gap. Its presence in multiple databases highlights its significance as a subject of interest in solid-state physics and materials science research.
Key Properties
Cross-validated computational properties for CoGe, aggregated across 4 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 CoGe. 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 CoGe, 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. |
|---|---|---|---|---|---|
| C2/m (No. 12) | monoclinic | 0.00 | 0.0000 | -0.193 | — |
| C2/m (No. 12) | monoclinic | 0.00 | 0.0000 | -13.626 | 8.43 |
| — | — | 0.00 | 0.0000 | -0.225 | — |
| — | — | 0.00 | 0.0056 | -0.220 | — |
| P213 (No. 198) | cubic | 0.00 | 0.0232 | -13.602 | 9.10 |
| P213 (No. 198) | cubic | 0.00 | 0.0312 | -0.162 | — |
| P-6m2 (No. 187) | hexagonal | 0.00 | 0.1453 | -0.048 | — |
| — | — | 0.00 | 0.1849 | -0.041 | — |
| — | — | 0.00 | 0.1854 | -0.040 | — |
| — | — | 0.00 | 0.2073 | -0.018 | — |
| — | — | 0.00 | 0.2218 | -0.004 | — |
| Cm (No. 8) | monoclinic | 0.00 | 0.2276 | -13.398 | 7.78 |
Applications
Where CoGe is used.
Frequently Asked Questions
Common questions about CoGe, answered from cross-validated data.
What is CoGe?
CoGe is a thermodynamically stable metallic compound formed from cobalt and germanium.
What is CoGe used for?
What is the band gap of CoGe?
Is CoGe a metal, semiconductor, or insulator?
Is CoGe thermodynamically stable?
What is the crystal structure of CoGe?
How many polymorphs of CoGe are known?
What elements does CoGe contain?
Where does the data for CoGe come from?
How It Compares
As a binary intermetallic compound, CoGe represents a fundamental structural building block within its class. Its thermodynamic stability makes it a reliable reference point for studying cobalt-germanium phase interactions and the electronic behavior of transition metal germanides.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- 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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