# Co–Cu system

> Co–Cu system: 75 accepted literature values (mixing / partial 29, activity / EMF / Gibbs energy 23, invariant reaction 12, phase equilibrium 10) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/CO-CU.html · Markdown: https://data.orchid-project.org/systems/CO-CU.md

75 accepted literature values from 2 paper(s) (experimental 63, model 12); 4 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/CO-CU.json) · [CSV](https://data.orchid-project.org/systems/CO-CU.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-CU) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-CU/CoCu-00Kub-LB.json) · [phases (4)](https://data.orchid-project.org/phases/pages/CO-CU.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-CU.html) · [Markdown](https://data.orchid-project.org/systems/CO-CU.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 63 |
| model | 12 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 12 |
| phase equilibrium | 10 |
| mixing / partial | 29 |
| heat capacity / entropy / enthalpy | 1 |
| activity / EMF / Gibbs energy | 23 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| CoCu-00Kub-LB.tdb | J. Kubista, J. Vrestal, J. Phase Equilib., 21, 125-29(2000). [doi:10.1361/105497100770340165](https://doi.org/10.1361/105497100770340165) | `e190588a17897dcba6dee61dc2e7c674ce36a207c0491726a8d9c2ca5913041f` | [viewer](https://orchid-project.org/phase-diagrams/#CO-CU/CoCu-00Kub-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoCu-00Kub-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoCu-00Kub-LB.json) |
| CoCu-06Pal.tdb | M. Palumbo, S. Curiotto, L. Battezzati, Calphad, 30, 171-78(2006). [doi:10.1016/j.calphad.2005.10.007](https://doi.org/10.1016/j.calphad.2005.10.007) | `e6f9f7cd2524034b8162b1891c3380d13aeb1840c86a06d8af76ef1067602cdb` | [viewer](https://orchid-project.org/phase-diagrams/#CO-CU/CoCu-06Pal.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoCu-06Pal.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoCu-06Pal.json) |
| CoCu-80Has.tdb | M. Haseba, T. Nishizawa, Calphad, 4, 83-100(1980). [doi:10.1016/0364-5916(80)90026-7](https://doi.org/10.1016/0364-5916%2880%2990026-7) | `aab8a56c0d106053f31f3346e4d994f30859ea4ec8d0585fc2ed300addb40897` | [viewer](https://orchid-project.org/phase-diagrams/#CO-CU/CoCu-80Has.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoCu-80Has.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoCu-80Has.json) |
| CoCu-97Oht.tdb | H. Ohtani, H. Suda, K. Ishida, ISIJ Int., 37, 207-16(1997). [doi:10.2355/isijinternational.37.207](https://doi.org/10.2355/isijinternational.37.207) | `dadbec645d9a2e07431ab1aa232a27aa4c28926f0a630e2a5ca264ea88d1ccc8` | [viewer](https://orchid-project.org/phase-diagrams/#CO-CU/CoCu-97Oht.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoCu-97Oht.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoCu-97Oht.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoCu-00Kub-LB.tdb | 1380.75 | FCC_A1#2 (x(Cu) 0.09852) + FCC_A1 (x(Cu) 0.91183) + LIQUID (x(Cu) 0.92261) |
| CoCu-00Kub-LB.tdb | 709.66 | FCC_A1 (x(Cu) 0.00244) + HCP_A3 (x(Cu) 0.00404) + FCC_A1#2 (x(Cu) 0.99747) |
| CoCu-06Pal.tdb | 1378.27 | FCC_A1#2 (x(Cu) 0.12484) + FCC_A1 (x(Cu) 0.90809) + LIQUID (x(Cu) 0.94667) |
| CoCu-06Pal.tdb | 685.61 | HCP_A3 (x(Cu) 0.00136) + FCC_A1#2 (x(Cu) 0.00239) + FCC_A1 (x(Cu) 0.99954) |
| CoCu-80Has.tdb | 1383.32 | FCC_A1 (x(Cu) 0.10876) + FCC_A1#2 (x(Cu) 0.91943) + LIQUID (x(Cu) 0.94877) |
| CoCu-80Has.tdb | 692.73 | HCP_A3 (x(Cu) 2.100e-4) + FCC_A1#2 (x(Cu) 4.500e-4) + FCC_A1 (x(Cu) 0.99971) |
| CoCu-97Oht.tdb | 1383.35 | FCC_A1 (x(Cu) 0.10917) + FCC_A1#2 (x(Cu) 0.91939) + LIQUID (x(Cu) 0.94878) |
| CoCu-97Oht.tdb | 692.65 | HCP_A3 (x(Cu) 2.100e-4) + FCC_A1#2 (x(Cu) 4.600e-4) + FCC_A1 (x(Cu) 0.99971) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-CU.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-CU.json) · [CALPHAD hull CoCu-00Kub-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-CU--CoCu-00Kub-LB.json) · [CALPHAD hull CoCu-80Has](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-CU--CoCu-80Has.json) · [CALPHAD hull CoCu-97Oht](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-CU--CoCu-97Oht.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Cu system (12)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1386 | L + (αCo) \<=> (αCu) | L: Co 0.057; (αCo): Co 0.883 | model | [1] Turchanin 2007 | Table 1, p. 6, row 12; `ORC-UXAXREWNXY` |  |
| 1385 | L + (αCo) \<=> (αCu) | L: Co 0.051; (αCo): Co 0.874 | model | [1] Turchanin 2007; _cites ref. 13_ | Table 1, p. 6, row 10; `ORC-7KGDHIEELG` |  |
| 1385 | L + (αCo) \<=> (αCu) | L: Co 0.048; (αCo): Co 0.88 | experimental | [1] Turchanin 2007; _cites ref. 27_ | Table 1, p. 6, row 3; `ORC-DG4V432K4R` |  |
| 1385 | L + (αCo) \<=> (αCu) |  | experimental | [1] Turchanin 2007; _cites ref. 28_ | Table 1, p. 6, row 4; `ORC-YV2XIOBOIQ` |  |
| 1381 | L + (αCo) \<=> (αCu) | L: Co 0.077; (αCo): Co 0.902 | model | [1] Turchanin 2007; _cites ref. 15_ | Table 1, p. 6, row 11; `ORC-KR5YUBUGEG` |  |
| 1379 | L + (αCo) \<=> (αCu) | L: Co 0.04; (αCo): Co 0.876 | model | [1] Turchanin 2007; _cites ref. 6_ | Table 1, p. 6, row 8; `ORC-EVRMNYLBO4` |  |
| 1370 | L + (αCo) \<=> (αCu) | L: Co 0.073; (αCo): Co 0.876 | model | [1] Turchanin 2007; _cites ref. 12_ | Table 1, p. 6, row 9; `ORC-TJTS64G2GK` |  |
| 717 | (αCo) \<=> (Cu) + (εCo) | (αCo): Co 0.992; (Cu): Co 0.005; (εCo): Co 0.994 | model | [1] Turchanin 2007; _cites ref. 12_ | Table 1, p. 6, row 18; `ORC-6IUF6XJ4TZ` |  |
| 698 | (Cu) + (αCo) \<=> (εCo) | (Cu): Co 4.000e-4; (αCo): Co 0.9981; (εCo): Co 0.9977 | model | [1] Turchanin 2007 | Table 1, p. 6, row 20; `ORC-GJU3JVEGEF` |  |
| 695 | (αCo) \<=> (Cu) + (εCo) | (αCo): Co 0.999; (Cu): Co 4.000e-4; (εCo): Co 0.9996 | model | [1] Turchanin 2007; _cites ref. 13_ | Table 1, p. 6, row 19; `ORC-UIIUAPKTUF` |  |
| 693 | (αCo) \<=> (Cu) + (εCo) | (αCo): Co 0.9992; (Cu): Co 8.000e-4; (εCo): Co 0.9995 | model | [1] Turchanin 2007; _cites ref. 6_ | Table 1, p. 6, row 17; `ORC-MGH7PJH42T` |  |
| 615 | (αCo) \<=> (Cu) + (εCo) | (αCo): Co 0.905 | experimental | [1] Turchanin 2007; _cites ref. 27_ | Table 1, p. 6, row 13; `ORC-HJMSGHXM27` |  |

## Other properties

### Phase equilibrium (10)

Table: Phase equilibrium, Co–Cu system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  |  | Co-rich phase; _Co-rich phase: Co 0.9492, Cu 0.0508_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 10; `ORC-EHRURO7JYC` |  |
| Phase composition |  |  | Co-rich phase; _Co-rich phase: Co 0.9848, Cu 0.0152_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 9; `ORC-NBYG3TKQRN` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9274, Cu 0.0726; Cu-rich phase: Co 0.1065, Cu 0.8935_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 6; `ORC-2YW7RDR72Q` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.8992, Cu 0.1008; Cu-rich phase: Co 0.0715, Cu 0.9285_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 4; `ORC-45RLZRH3A2` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9198, Cu 0.0802; Cu-rich phase: Co 0.04, Cu 0.96_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 1; `ORC-FNSVAJVLBO` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9088, Cu 0.0912; Cu-rich phase: Co 0.1131, Cu 0.8869_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 7; `ORC-JHZPDIRHER` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9111, Cu 0.0889; Cu-rich phase: Co 0.0784, Cu 0.9216_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 5; `ORC-OTFKXDWJPF` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9004, Cu 0.0996; Cu-rich phase: Co 0.0751, Cu 0.9249_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 2; `ORC-RGY6VB6V6I` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9325, Cu 0.0675; Cu-rich phase: Co 0.1225, Cu 0.8775_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 8; `ORC-SRCCJASYDW` |  |
| Phase composition |  |  | Co-rich phase + Cu-rich phase; _Co-rich phase: Co 0.9131, Cu 0.0869; Cu-rich phase: Co 0.0715, Cu 0.9285_ | experimental | [2] Kubišta 2000 | Table 1, p. 3, row 3; `ORC-T54NDEJ4AW` |  |

### Mixing / partial (29)

Table: Mixing / partial, Co–Cu system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing; _printed: ΔH^E_ | 5.575 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.8, Cu 0.2_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 3; `ORC-3RZGRHX4QP.5eca3d` |  |
| Enthalpy of mixing; _printed: ΔHE_ | 7.828 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.4, Cu 0.6_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 7; `ORC-3X4RSXHHJB.1883b3` |  |
| Enthalpy of mixing; _printed: ΔHE_ | 6.733 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.3, Cu 0.7_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 8; `ORC-66G22ACQWU.e8c717` |  |
| Enthalpy of mixing; _printed: ΔH^E_ | 3.186 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.9, Cu 0.1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 2; `ORC-7Q6GTFL6KA.5bb55e` |  |
| Enthalpy of mixing; _printed: HE_ | 8.294 kJ/mol (basis unstated) | 1810.15 | liquid | model | [2] Kubišta 2000 | p. 3; `ORC-ILEYL6ODWZ.3b8ee0` | “Liquid Co-Cu alloys are characterized by positive values of the molar excess Gibbs energies GE at 1537 °C (Fig. 2, Table 4), positive values of the molar excess entropies SE (Table 4), and endothermic molar heat of mixing HE (Fig. 3, Table 4). At that temperature, the maximum HE value is 8294 J·mol-1 at 50at.%Cu, the maximum SE value is 1.00 J·mol-1·K-1 at 40at.%Cu, and the maximum GE value is 65…” |
| Enthalpy of mixing; _printed: ΔHE_ | 2.785 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.1, Cu 0.9_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 10; `ORC-KO7WAXW372.97dc89` |  |
| Enthalpy of mixing; _printed: ΔHE_ | 8.294 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.5, Cu 0.5_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 6; `ORC-PTBBESK7CF.2edb73` |  |
| Enthalpy of mixing; _printed: ΔHE_ | 7.201 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.7, Cu 0.3_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 4; `ORC-ROR6FAZ425.90d29e` |  |
| Enthalpy of mixing; _printed: ΔHE_ | 5.04 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.2, Cu 0.8_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 9; `ORC-S3GQ53FH2A.1e0ce8` |  |
| Enthalpy of mixing; _printed: ΔH^E_ | 8.096 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.6, Cu 0.4_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 5; `ORC-VBBQTFHUJL.dc0890` |  |
| Enthalpy of mixing; _printed: mixing enthalpy_ | 9.7 kJ/mol (basis unstated) | 1834 |  | experimental | [1] Turchanin 2007; _cites ref. 17_ | p. 2; `ORC-TWNJLLQJYM` | “The integral mixing enthalpies were determined in \[17\] for 10 alloys of xCo = 0.092-0.931 by mixing metals heated to an experimental temperature of 1834 K in an isothermal calorimeter. It is established that the mixing enthalpy of the system is endothermic and is maximum (9.7 kJ/mole) near the equiatomic composition (Fig. 2).” |
| Entropy of mixing; _printed: ΔS^E_ | 0.779 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.8, Cu 0.2_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 3; `ORC-3RZGRHX4QP.98de70` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.847 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.4, Cu 0.6_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 7; `ORC-3X4RSXHHJB.6ba597` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.671 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.3, Cu 0.7_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 8; `ORC-66G22ACQWU.9c030b` |  |
| Entropy of mixing; _printed: ΔS^E_ | 0.468 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.9, Cu 0.1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 2; `ORC-7Q6GTFL6KA.fad00f` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.227 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.1, Cu 0.9_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 10; `ORC-KO7WAXW372.57885c` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.966 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.5, Cu 0.5_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 6; `ORC-PTBBESK7CF.4df24f` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.952 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.7, Cu 0.3_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 4; `ORC-ROR6FAZ425.d75a32` |  |
| Entropy of mixing; _printed: ΔSE_ | 0.457 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.2, Cu 0.8_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 9; `ORC-S3GQ53FH2A.ac5ff8` |  |
| Entropy of mixing; _printed: ΔS^E_ | 1.008 J/mol (basis unstated)/K | 1810.15 | liquid; _alloy: Co 0.6, Cu 0.4_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 5; `ORC-VBBQTFHUJL.a374af` |  |
| Gibbs energy of mixing; _printed: ΔG^E_ | 4.165 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.8, Cu 0.2_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 3; `ORC-3RZGRHX4QP.d05f14` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 6.295 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.4, Cu 0.6_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 7; `ORC-3X4RSXHHJB.e21fee` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 5.519 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.3, Cu 0.7_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 8; `ORC-66G22ACQWU.910498` |  |
| Gibbs energy of mixing; _printed: ΔG^E_ | 2.339 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.9, Cu 0.1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 2; `ORC-7Q6GTFL6KA.8a5ede` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 2.374 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.1, Cu 0.9_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 10; `ORC-KO7WAXW372.c8644e` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 6.545 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.5, Cu 0.5_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 6; `ORC-PTBBESK7CF.6e079f` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 5.477 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.7, Cu 0.3_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 4; `ORC-ROR6FAZ425.6e6fca` |  |
| Gibbs energy of mixing; _printed: ΔGE_ | 4.213 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.2, Cu 0.8_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 9; `ORC-S3GQ53FH2A.e0c90c` |  |
| Gibbs energy of mixing; _printed: ΔG^E_ | 6.272 kJ/mol (basis unstated) | 1810.15 | liquid; _alloy: Co 0.6, Cu 0.4_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 5; `ORC-VBBQTFHUJL.0249b3` |  |

### Heat capacity / entropy / enthalpy (1)

Table: Heat capacity / entropy / enthalpy, Co–Cu system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| sm excess; _printed: SE_ | 1 J·mol-1·K-1 | 1810.15 | liquid | model | [2] Kubišta 2000 | p. 3; `ORC-ILEYL6ODWZ.2d38c5` | “Liquid Co-Cu alloys are characterized by positive values of the molar excess Gibbs energies GE at 1537 °C (Fig. 2, Table 4), positive values of the molar excess entropies SE (Table 4), and endothermic molar heat of mixing HE (Fig. 3, Table 4). At that temperature, the maximum HE value is 8294 J·mol-1 at 50at.%Cu, the maximum SE value is 1.00 J·mol-1·K-1 at 40at.%Cu, and the maximum GE value is 65…” |

### Activity / EMF / Gibbs energy (23)

Table: Activity / EMF / Gibbs energy, Co–Cu system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Activity Co; _printed: a_Co_ | 0.856 1 | 1810.15 | liquid; _alloy: Co 0.8, Cu 0.2_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 3; `ORC-3RZGRHX4QP.853002` |  |
| Activity Co; _printed: aCo_ | 0.746 1 | 1810.15 | liquid; _alloy: Co 0.4, Cu 0.6_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 7; `ORC-3X4RSXHHJB.5ad3c2` |  |
| Activity Co; _printed: aCo_ | 0.703 1 | 1810.15 | liquid; _alloy: Co 0.3, Cu 0.7_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 8; `ORC-66G22ACQWU.923eda` |  |
| Activity Co; _printed: a_Co_ | 0.915 1 | 1810.15 | liquid; _alloy: Co 0.9, Cu 0.1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 2; `ORC-7Q6GTFL6KA.8134fe` |  |
| Activity Co; _printed: aCo_ | 0.413 1 | 1810.15 | liquid; _alloy: Co 0.1, Cu 0.9_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 10; `ORC-KO7WAXW372.b551bf` |  |
| Activity Co; _printed: aCo_ | 0.769 1 | 1810.15 | liquid; _alloy: Co 0.5, Cu 0.5_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 6; `ORC-PTBBESK7CF.eca613` |  |
| Activity Co; _printed: aCo_ | 0.816 1 | 1810.15 | liquid; _alloy: Co 0.7, Cu 0.3_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 4; `ORC-ROR6FAZ425.6961aa` |  |
| Activity Co; _printed: aCo_ | 0.61 1 | 1810.15 | liquid; _alloy: Co 0.2, Cu 0.8_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 9; `ORC-S3GQ53FH2A.b85ce4` |  |
| Activity Co; _printed: a_Co_ | 1 1 | 1810.15 | liquid; _alloy: Co 1, Cu 0_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 1; `ORC-TR6KLBVTSD.4dbe74` |  |
| Activity Co; _printed: a_Co_ | 0.79 1 | 1810.15 | liquid; _alloy: Co 0.6, Cu 0.4_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 5; `ORC-VBBQTFHUJL.5d4d1c` |  |
| Activity Co; _printed: aCo_ | 0 1 | 1810.15 | liquid; _alloy: Co 0, Cu 1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 11; `ORC-XFCMBPD5UQ.f42952` |  |
| Activity Cu; _printed: a_Cu_ | 0.608 1 | 1810.15 | liquid; _alloy: Co 0.8, Cu 0.2_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 3; `ORC-3RZGRHX4QP.34b1f4` |  |
| Activity Cu; _printed: aCu_ | 0.796 1 | 1810.15 | liquid; _alloy: Co 0.4, Cu 0.6_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 7; `ORC-3X4RSXHHJB.883689` |  |
| Activity Cu; _printed: aCu_ | 0.821 1 | 1810.15 | liquid; _alloy: Co 0.3, Cu 0.7_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 8; `ORC-66G22ACQWU.c521c6` |  |
| Activity Cu; _printed: a_Cu_ | 0.406 1 | 1810.15 | liquid; _alloy: Co 0.9, Cu 0.1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 2; `ORC-7Q6GTFL6KA.086175` |  |
| Activity Cu; _printed: aCu_ | 0.916 1 | 1810.15 | liquid; _alloy: Co 0.1, Cu 0.9_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 10; `ORC-KO7WAXW372.c7f577` |  |
| Activity Cu; _printed: aCu_ | 0.776 1 | 1810.15 | liquid; _alloy: Co 0.5, Cu 0.5_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 6; `ORC-PTBBESK7CF.6e41b8` |  |
| Activity Cu; _printed: aCu_ | 0.705 1 | 1810.15 | liquid; _alloy: Co 0.7, Cu 0.3_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 4; `ORC-ROR6FAZ425.62ae41` |  |
| Activity Cu; _printed: aCu_ | 0.859 1 | 1810.15 | liquid; _alloy: Co 0.2, Cu 0.8_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 9; `ORC-S3GQ53FH2A.f54536` |  |
| Activity Cu; _printed: a_Cu_ | 0 1 | 1810.15 | liquid; _alloy: Co 1, Cu 0_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 1; `ORC-TR6KLBVTSD.3d2e76` |  |
| Activity Cu; _printed: a_Cu_ | 0.751 1 | 1810.15 | liquid; _alloy: Co 0.6, Cu 0.4_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 5; `ORC-VBBQTFHUJL.091f08` |  |
| Activity Cu; _printed: aCu_ | 1 1 | 1810.15 | liquid; _alloy: Co 0, Cu 1_ | experimental | [2] Kubišta 2000 | Table 4, p. 4, row 11; `ORC-XFCMBPD5UQ.c49e11` |  |
| Gibbs energy; _printed: GE_ | 6545 J·mol-1 | 1810.15 | liquid | model | [2] Kubišta 2000 | p. 3; `ORC-ILEYL6ODWZ.65d744` | “Liquid Co-Cu alloys are characterized by positive values of the molar excess Gibbs energies GE at 1537 °C (Fig. 2, Table 4), positive values of the molar excess entropies SE (Table 4), and endothermic molar heat of mixing HE (Fig. 3, Table 4). At that temperature, the maximum HE value is 8294 J·mol-1 at 50at.%Cu, the maximum SE value is 1.00 J·mol-1·K-1 at 40at.%Cu, and the maximum GE value is 65…” |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. M. A. Turchanin, P. G. Agraval, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. V. Copper-cobalt system, Powder Metall Met Ceram 46, 77-89 (2007). [doi:10.1007/s11106-007-0013-9](https://doi.org/10.1007/s11106-007-0013-9)
2. Jaroslav Kubišta, Jan Vřešt’ál, Thermodynamics of the liquid Co-Cu system and calculation of phase diagram, JPE 21, 125-129 (2000). [doi:10.1361/105497100770340165](https://doi.org/10.1361/105497100770340165)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).