CoNi
Cobalt-nickel alloy · CoNi alloy
CoNi is a metallic alloy of cobalt and nickel that is primarily utilized for its magnetic and mechanical properties in high-performance engineering.
About Cobalt-nickel alloy
CoNi is a metallic binary alloy composed of cobalt and nickel. As a metastable system, it represents a significant subject of study within materials science, characterized by its complex structural landscape and diverse atomic arrangements observed across multiple databases. Its metallic nature ensures high electrical and thermal conductivity, making it a foundational material for various industrial applications.
The material is particularly valued for its magnetic properties and its ability to be tailored through processing. Because it exists in a metastable state, its microstructure can be precisely manipulated to optimize mechanical strength and corrosion resistance, which are critical for performance in demanding environments.
Key Properties
Cross-validated computational properties for Cobalt-nickel alloy, 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 CoNi. 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 CoNi, 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. |
|---|---|---|---|---|---|
| P-6m2 (No. 187) | hexagonal | 0.00 | 0.0122 | -0.010 | — |
| — | — | 0.00 | 0.0138 | -0.010 | — |
| — | — | 0.00 | 0.0148 | -0.008 | — |
| R-3m (No. 166) | trigonal | 0.00 | 0.0172 | -0.005 | — |
| — | — | 0.00 | 0.0243 | 0.001 | — |
| R-3m (No. 166) | trigonal | 0.00 | 0.0303 | -12.593 | 9.22 |
| — | — | 0.00 | 0.0592 | 0.036 | — |
| Cmmm (No. 65) | orthorhombic | 0.00 | 0.1231 | -12.500 | 9.01 |
| Pm-3m (No. 221) | cubic | 0.00 | 0.1696 | -12.454 | 8.88 |
| — | — | 0.00 | 0.1718 | 0.149 | — |
| Pm-3m (No. 221) | cubic | 0.00 | 0.1830 | 0.161 | — |
| Pm-3m (No. 221) | cubic | 0.00 | 0.1835 | 0.162 | — |
Synthesis Routes
Literature-extracted synthesis procedures targeting CoNi.
Applications
Where Cobalt-nickel alloy is used.
Patent Landscape
1 patent reference CoNi or close compositional variants.
| Patent | Title | Assignee | Granted |
|---|---|---|---|
| 12381220 | Methods for preparing CoNi—S@3D-C nanocomposite and modified battery separator | — | — |
Frequently Asked Questions
Common questions about Cobalt-nickel alloy, answered from cross-validated data.
What is CoNi?
CoNi is a metallic alloy of cobalt and nickel that is primarily utilized for its magnetic and mechanical properties in high-performance engineering.
What is CoNi used for?
What is the band gap of CoNi?
Is CoNi a metal, semiconductor, or insulator?
Is CoNi thermodynamically stable?
What is the crystal structure of CoNi?
What is the density of CoNi?
How many polymorphs of CoNi are known?
How is CoNi synthesized?
What elements does CoNi contain?
Where does the data for CoNi come from?
How It Compares
As a binary metallic alloy, CoNi serves as a fundamental model for understanding solid-solution behavior and phase stability in transition metal systems. It occupies a distinct role in metallurgy, bridging the properties of its parent elements to provide a balanced profile of magnetic permeability and structural robustness that is highly sought after in specialized alloy design.
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)
- 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)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (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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