CoPt
Cobalt platinum · Co-Pt alloy
CoPt is a thermodynamically stable metallic alloy of cobalt and platinum used extensively in catalysis and magnetic storage technologies.
About Cobalt platinum
CoPt is a robust metallic alloy composed of cobalt and platinum. As a thermodynamically stable phase residing on the convex hull, it exhibits excellent structural integrity and consistent electronic properties suitable for demanding catalytic environments. Its metallic nature facilitates efficient electron transfer, making it a critical material for advanced electrochemical applications. Due to its extensive research history, this compound is well-characterized across multiple structural databases, underscoring its reliability in material design. It is primarily valued for its role in high-density magnetic recording media and as a catalyst in various industrial chemical processes.
Key Properties
Cross-validated computational properties for Cobalt platinum, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CoPt. 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 CoPt, 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. |
|---|---|---|---|---|---|
| — | — | 0.00 | 0.0000 | -0.095 | — |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.0000 | -6.675 | 15.79 |
| P4/mmm (No. 123) | tetragonal | 0.00 | 0.0025 | -0.070 | — |
| — | — | 0.00 | 0.0028 | -0.092 | — |
| — | — | 0.00 | 0.0514 | -0.044 | — |
| — | — | 0.00 | 0.0527 | -0.042 | — |
| R-3m (No. 166) | trigonal | 0.00 | 0.0587 | -6.617 | 15.71 |
| — | — | 0.00 | 0.1813 | 0.086 | — |
| — | — | 0.00 | 0.3208 | 0.226 | — |
| — | — | 0.00 | 0.6634 | 0.569 | — |
| — | — | 0.00 | 0.8490 | 0.754 | — |
| — | — | 0.00 | 0.9938 | 0.899 | — |
Synthesis Routes
Literature-extracted synthesis procedures targeting CoPt.
Applications
Where Cobalt platinum is used.
Patent Landscape
2 patents reference CoPt or close compositional variants.
| Patent | Title | Assignee | Granted |
|---|---|---|---|
| 12142404 | Hard-magnet L10-CoPt nanoparticles advance fuel cell catalysis | — | — |
| 6406600 | CoPt-base sputtering target, method of making same, magnetic recording film and Co-Pt-base magnetic recording | — | — |
Frequently Asked Questions
Common questions about Cobalt platinum, answered from cross-validated data.
What is CoPt?
CoPt is a thermodynamically stable metallic alloy of cobalt and platinum used extensively in catalysis and magnetic storage technologies.
What is CoPt used for?
What is the band gap of CoPt?
Is CoPt a metal, semiconductor, or insulator?
Is CoPt thermodynamically stable?
What is the crystal structure of CoPt?
What is the density of CoPt?
How many polymorphs of CoPt are known?
How is CoPt synthesized?
What elements does CoPt contain?
Where does the data for CoPt come from?
How It Compares
Within the platinum-group alloy catalysts class.
Within the diverse family of platinum-group alloys, CoPt stands out for its exceptional thermodynamic stability compared to more complex or less ordered counterparts like As2Pt or Ga2Ru. While many members of this class are explored for specific niche catalytic functions, CoPt is distinguished by its well-documented structural versatility and its proven utility in both magnetic and catalytic fields, positioning it as a cornerstone material relative to other binary intermetallics in the group.
Related Compounds
Other Platinum-Group Alloy Catalysts in the database.
Data sources & attribution
- 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)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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