Co–Fe system

10 accepted literature values from 2 paper(s) (experimental 9, DFT 1); 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 (5) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	9
DFT	1

Accepted values by property group
Property group	Values
phase equilibrium	9
mixing / partial	1

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
CoFe-02Ohn.tdb	I. Ohnuma, H. Enoki, O. Ikeda, R. Kainuma, H. Ohtani, B. Sundman, K. Ishida, Acta Mater., 50, 379-93(2002). doi:10.1016/S1359-6454(01)00337-8	`4ed3ddb5c0d6db77898f57a5a2707ccc16fd3166452d716e97b56d4ca23af9cd`	viewer · TDB · JSON
CoFe-15Rod.tdb	J.E. Rodriguez, D.M. Matson, Calphad, 49, 87-100(2015). doi:10.1016/j.calphad.2015.03.001	`b439f24ad16996c6d1c9de95859f4110298fffc3cd6c3ddbc92f172b29ca73d0`	viewer · TDB · JSON
CoFe-17Wan.tdb	J. Wang, X.-G. Lu, N. Zhu, W. Zheng, Calphad, 58, 82-100(2017). doi:10.1016/j.calphad.2017.06.001	`324b5028ec03d3950620d131235ecd322f2ccf53b9d5022dd55cc6a8ed415d2b`	viewer · TDB · JSON
CoFe-87Fer-LB.tdb	A. Fernandez Guillermet, High Temp. High Press., 19, 477-99(1987).	`edf9a6fc99f8e55aa8aaac8e3e08ec3e93110f4e674052dcc424377b29b1a21f`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoFe-02Ohn.tdb	1771.95	LIQUID (x(Fe) 0.82085) + FCC_A1 (x(Fe) 0.82868) + B2_BCC (x(Fe) 0.83543)
CoFe-02Ohn.tdb	494.23	HCP_A3 (x(Fe) 0.02252) + FCC_A1 (x(Fe) 0.05029) + B2_BCC (x(Fe) 0.24766)
CoFe-15Rod.tdb	1769.67	LIQUID (x(Fe) 0.78298) + FCC_A1 (x(Fe) 0.79081) + BCC_A2 (x(Fe) 0.79601)
CoFe-15Rod.tdb	406.16	HCP_A3 (x(Fe) 0.03623) + FCC_A1 (x(Fe) 0.06146) + BCC_A2 (x(Fe) 0.18484)
CoFe-17Wan.tdb	1773.69	LIQUID (x(Fe) 0.8104) + FCC_A1 (x(Fe) 0.81941) + BCC_A2 (x(Fe) 0.82638)
CoFe-17Wan.tdb	1773.69	LIQUID (x(Fe) 0.8104) + FCC_A1 (x(Fe) 0.81941) + B2_BCC (x(Fe) 0.82638)
CoFe-17Wan.tdb	450.81	HCP_A3 (x(Fe) 0.01972) + FCC_A1 (x(Fe) 0.05103) + B2_BCC (x(Fe) 0.23523)
CoFe-87Fer-LB.tdb	1777.77	LIQUID (x(Fe) 0.83052) + FCC_A1 (x(Fe) 0.83904) + BCC_A2 (x(Fe) 0.8475)
CoFe-87Fer-LB.tdb	435.23	HCP_A3 (x(Fe) 0.03266) + FCC_A1 (x(Fe) 0.05824) + BCC_A2 (x(Fe) 0.20502)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CoFe-02Ohn · CALPHAD hull CoFe-15Rod · CALPHAD hull CoFe-87Fer-LB

Other properties

Phase equilibrium (9)

Phase equilibrium, Co–Fe system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition	673.15	b.c.c. + f.c.c. b.c.c.: Co 0.704, Fe 0.296; f.c.c.: Co 0.927, Fe 0.073	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 8 report
Phase composition	723.15	b.c.c. + f.c.c. b.c.c.: Co 0.709, Fe 0.291; f.c.c.: Co 0.908, Fe 0.092	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 7 report
Phase composition	773.15	b.c.c. + f.c.c. b.c.c.: Co 0.737, Fe 0.263; f.c.c.: Co 0.904, Fe 0.096	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 6 report
Phase composition	823.15	b.c.c. + f.c.c. b.c.c.: Co 0.739, Fe 0.261; f.c.c.: Co 0.891, Fe 0.109	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 5 report
Phase composition	873.15	b.c.c. + f.c.c. b.c.c.: Co 0.747, Fe 0.253; f.c.c.: Co 0.891, Fe 0.109	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 4 report
Phase composition	973.15	b.c.c. + f.c.c. b.c.c.: Co 0.74, Fe 0.26; f.c.c.: Co 0.849, Fe 0.151	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 3 report
Phase composition	973.15	b.c.c. + f.c.c. b.c.c.: Co 0.745, Fe 0.255; f.c.c.: Co 0.851, Fe 0.149	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 2 report
Phase composition	1073.15	b.c.c. + f.c.c. b.c.c.: Co 0.736, Fe 0.264; f.c.c.: Co 0.804, Fe 0.196	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 1 report
Phase composition	1073.15	b.c.c. + f.c.c. b.c.c.: Co 0.736, Fe 0.264; f.c.c.: Co 0.804, Fe 0.196	experimental	[1] Ohnuma 2002	Table 1, p. 6, row 9 report

Mixing / partial (1)

Mixing / partial, Co–Fe system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Enthalpy of mixing printed: ΔmixH^SQS	-3.392 kJ/mol-atom		fcc alloy: Co 0.5, Fe 0.5	DFT	[2] Bracq 2021	Table 1, p. 4, row 2 report

Sources

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

Ikuo Ohnuma, Hirotoshi Enoki, Osamu Ikeda, Ryosuke Kainuma, Hiroshi Ohtani, Bo Sundman et al., Phase equilibria in the Fe–Co binary system, Acta Materialia 50, 379-393 (2002). doi:10.1016/s1359-6454(01)00337-8
Guillaume Bracq, Jean-Claude Crivello, Mathilde Laurent-Brocq, Jean-Marc Joubert, Ivan Guillot, What is the Enthalpy Contribution to the Stabilization of the Co–Cr–Fe–Mn–Ni Faced-centered Cubic Solid Solution?, J. Phase Equilib. Diffus. 42, 561-570 (2021). doi:10.1007/s11669-021-00922-9

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}
}