Cu–Ni system

31 accepted literature values from 2 paper(s) (experimental 31); 4 calculated phase diagram(s). 7 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (4) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	31

Accepted values by property group
Property group	Values
mixing / partial	3
activity / EMF / Gibbs energy	28

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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
CuNi-07Tur.tdb	M.A. Turchanin, P.G. Agraval, A.R. Abdulov, Powder Metall. Met. Ceram., 46, 467-77(2007). doi:10.1007/s11106-007-0013-9	`10031ba89321cab1e44115d6fa90ffa375b8daa4c4ee8d4c0bf0b9f027b1c488`	viewer · TDB · JSON
CuNi-87Jan.tdb	A. Jansson, TRITA-MAC 340, KTH, Stockholm 1987.	`c378a4dea0f2dadf130df3dbfd46ff643d92c32242bb19a0a743b2d29d1f2d59`	viewer · TDB · JSON
CuNi-89Sri.tdb	S. Srikanth, K.T. Jacob, Mater. Sci. Technol., 5, 427-34(1989). doi:10.1179/mst.1989.5.5.427	`39b018ea8c7d3c13c313c0275c736b6516c8bfc5c0d2efaf0cf5b4a3963fc3f7`	viewer · TDB · JSON
CuNi-92Mey-LB.tdb	S. an Mey, Calphad 16, 255-60(1992).	`7e52adda858e302168ae26b5abfe17f4726ccbfaaff0880abcad5b38e3f559e1`	viewer · TDB · JSON

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CuNi-87Jan · CALPHAD hull CuNi-89Sri · CALPHAD hull CuNi-92Mey-LB

Other properties

Mixing / partial (3)

Mixing / partial, Cu–Ni system
Property	Value	T (K)	Class	Source	Location	Quote
Enthalpy of mixing printed: enthalpy of mixing	1.59 kJ/mol (basis unstated)	1113	experimental	[1] Srikanth 1989 cites ref. 10	p. 2 report	Oriani and Murphy10 used a differential solution calorimeter using liquid tin as the solvent to measure enthalpy of mixing in solid Cu-Ni alloys at 1113 K. Their study gives a maximum value of 1590 J mol-1 at XNi '" 0·7.
Enthalpy of mixing printed: ~Hmax	8 kJ/mol (basis unstated)	1773	experimental	[1] Srikanth 1989 cites EL'KHASAN 1966	p. 7 report	El'Khasan et ai.39 report high exothermic values for the enthalpy of mixing (~Hmax= 8 kJ mol-1) at 1773 K and their results are not compatible with other calorimetric studies.
Partial enthalpy printed: ∞ ΔH Co	42 kJ/mol (basis unstated) ± 2.4	1385	experimental	[2] Turchanin 2007 cites ref. 19	p. 2 report	The above results are in agreement with [19], which established the first enthalpy of cobalt mixing ∞ ΔH Co = 42.0 ± 2.4 kJ/mole at 1385 K using a high-temperature Tian-Calvet calorimeter.

Activity / EMF / Gibbs energy (28)

Activity / EMF / Gibbs energy, Cu–Ni system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Activity Cu printed: aCu	0.5141 1	1000	UNKNOWN alloy: Cu 0.2, Ni 0.8	experimental	[1] Srikanth 1989	Table 1, p. 4, row 8 report
Activity Cu printed: aCu	0.7926 1	1000	UNKNOWN alloy: Cu 0.7, Ni 0.3	experimental	[1] Srikanth 1989	Table 1, p. 4, row 3 report
Activity Cu printed: aCu	0.8463 1	1000	UNKNOWN alloy: Cu 0.8, Ni 0.2	experimental	[1] Srikanth 1989	Table 1, p. 4, row 2 report
Activity Cu printed: aCu	0.9128 1	1000	UNKNOWN alloy: Cu 0.9, Ni 0.1	experimental	[1] Srikanth 1989	Table 1, p. 4, row 1 report
Activity Cu printed: aCu	0.5873 1	1000	UNKNOWN alloy: Cu 0.3, Ni 0.7	experimental	[1] Srikanth 1989	Table 1, p. 4, row 7 report
Activity Cu printed: aCu	0.6391 1	1000	UNKNOWN alloy: Cu 0.4, Ni 0.6	experimental	[1] Srikanth 1989	Table 1, p. 4, row 6 report
Activity Cu printed: aCu	0.3649 1	1000	UNKNOWN alloy: Cu 0.1, Ni 0.9	experimental	[1] Srikanth 1989	Table 1, p. 4, row 9 report
Activity Cu printed: aCu	0.6856 1	1000	UNKNOWN alloy: Cu 0.5, Ni 0.5	experimental	[1] Srikanth 1989	Table 1, p. 4, row 5 report
Activity Cu printed: aCu	0.7376 1	1000	UNKNOWN alloy: Cu 0.6, Ni 0.4	experimental	[1] Srikanth 1989	Table 1, p. 4, row 4 report
Activity Ni printed: aNi	0.8686 1	1000	UNKNOWN alloy: Cu 0.2, Ni 0.8	experimental	[1] Srikanth 1989	Table 1, p. 4, row 8 report
Activity Ni printed: aNi	0.5985 1	1000	UNKNOWN alloy: Cu 0.7, Ni 0.3	experimental	[1] Srikanth 1989	Table 1, p. 4, row 3 report
Activity Ni printed: aNi	0.4894 1	1000	UNKNOWN alloy: Cu 0.8, Ni 0.2	experimental	[1] Srikanth 1989	Table 1, p. 4, row 2 report
Activity Ni printed: aNi	0.3103 1	1000	UNKNOWN alloy: Cu 0.9, Ni 0.1	experimental	[1] Srikanth 1989	Table 1, p. 4, row 1 report
Activity Ni printed: aNi	0.8322 1	1000	UNKNOWN alloy: Cu 0.3, Ni 0.7	experimental	[1] Srikanth 1989	Table 1, p. 4, row 7 report
Activity Ni printed: aNi	0.7953 1	1000	UNKNOWN alloy: Cu 0.4, Ni 0.6	experimental	[1] Srikanth 1989	Table 1, p. 4, row 6 report
Activity Ni printed: aNi	0.9185 1	1000	UNKNOWN alloy: Cu 0.1, Ni 0.9	experimental	[1] Srikanth 1989	Table 1, p. 4, row 9 report
Activity Ni printed: aNi	0.7506 1	1000	UNKNOWN alloy: Cu 0.5, Ni 0.5	experimental	[1] Srikanth 1989	Table 1, p. 4, row 5 report
Activity Ni printed: aNi	0.6856 1	1000	UNKNOWN alloy: Cu 0.6, Ni 0.4	experimental	[1] Srikanth 1989	Table 1, p. 4, row 4 report
EMF printed: E	6.1 mV	1000	UNKNOWN alloy: Cu 0.2, Ni 0.8	experimental	[1] Srikanth 1989	Table 1, p. 4, row 8 report
EMF printed: E	22.1 mV	1000	UNKNOWN alloy: Cu 0.7, Ni 0.3	experimental	[1] Srikanth 1989	Table 1, p. 4, row 3 report
EMF printed: E	30.8 mV	1000	UNKNOWN alloy: Cu 0.8, Ni 0.2	experimental	[1] Srikanth 1989	Table 1, p. 4, row 2 report
EMF printed: E	50.5 mV	1000	UNKNOWN alloy: Cu 0.9, Ni 0.1	experimental	[1] Srikanth 1989	Table 1, p. 4, row 1 report
EMF printed: E	7.9 mV	1000	UNKNOWN alloy: Cu 0.3, Ni 0.7	experimental	[1] Srikanth 1989	Table 1, p. 4, row 7 report
EMF printed: E	9.9 mV	1000	UNKNOWN alloy: Cu 0.4, Ni 0.6	experimental	[1] Srikanth 1989	Table 1, p. 4, row 6 report
EMF printed: E	3.7 mV	1000	UNKNOWN alloy: Cu 0.1, Ni 0.9	experimental	[1] Srikanth 1989	Table 1, p. 4, row 9 report
EMF printed: E	12.4 mV	1000	UNKNOWN alloy: Cu 0.5, Ni 0.5	experimental	[1] Srikanth 1989	Table 1, p. 4, row 5 report
EMF printed: E	16.3 mV	1000	UNKNOWN alloy: Cu 0.6, Ni 0.4	experimental	[1] Srikanth 1989	Table 1, p. 4, row 4 report
Gibbs energy printed: ΔfG°(CuI) - ΔfG°(0.5NiI2)	39 kJ mol-1	1000		experimental	[1] Srikanth 1989 cites KUBASCHEWSKI 1979	p. 6 report	Since the standard Gibbs' energies of formation of CuI and 0'5NiI2 differ by only 39 kJ mol-1 (Ref. 30) at 1000 K, it is possible that their measurements may be affected by the displacement reaction Ni(alloy) + 2Cu + ~ Nj2+ + 2Cu(alloy)

Sources

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

S. Srikanth, K. T. Jacob, Thermodynamic properties of Cu–Ni alloys: measurements and assessment, Materials Science and Technology 5, 427-434 (1989). doi:10.1179/mst.1989.5.5.427
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

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). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi: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). doi: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). doi: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.

@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}
}