C–Fe system

12 accepted literature values from 2 paper(s) (experimental 3, model 3, unspecified 6); 0 calculated phase diagram(s). 17 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (12) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	3
model	3
unspecified	6

Accepted values by property group
Property group	Values
invariant reaction	6
phase transition	6

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull FeC-10Hal · CALPHAD hull FeC-14Nar-3g · CALPHAD hull FeC-16Goh · CALPHAD hull FeC-19Che · CALPHAD hull FeC-19Mie · CALPHAD hull FeC-20Sae · CALPHAD hull FeC-23Jac · CALPHAD hull FeC-85Gus-LB

Invariant reactions (literature)

Invariant reactions reported in the literature for the C–Fe system (6)
T (K)	Reaction / phases	Class	Source	Location
1768.15	peritectic: L + α -> γ	unspecified	[1] Kumar 1991	Table 7, p. 6, row 2 report
1630.15	peritectic: L + gr -> κ	unspecified	[1] Kumar 1991	Table 7, p. 6, row 3 report
1601.15	eutectic: L -> α + κ	unspecified	[1] Kumar 1991	Table 7, p. 6, row 4 report
1488.15	peritectic: L + α -> ε	unspecified	[1] Kumar 1991	Table 7, p. 6, row 10 report
1427.15	eutectic: L -> γ + gr	unspecified	[1] Kumar 1991	Table 7, p. 6, row 17 report
1011.15	other: γ -> α + gr	unspecified	[1] Kumar 1991	Table 7, p. 6, row 23 report

Other properties

Phase transition (6)

Phase transition, C–Fe system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	470 K	470	other	model	[2] Naraghi 2014	p. 9 report	The intersection of the lines for cementite and Hägg carbide defines the triple point between α/χ/θ below which Hägg carbide is more stable than cementite. Similarly the intersection of the Hägg and eta carbides gives the α/η/χ triple point below which eta carbide is more stable than Hägg carbide. In the present evaluation these points are located at 720 K and 470 K respectively according to the…
Phase transition	483 K	483	magnetic	experimental	[2] Naraghi 2014 cites Umemoto 2001 doi	p. 3 report	Cementite has an orthorhombic crystal structure with a ferromagnetic transition around 483 K [29].
Phase transition	485 K	485	magnetic	model	[2] Naraghi 2014	p. 3 report	Due to the similarities of orthorhombic and fcc structures, p is selected as 0.25 for cementite as well, TC is set to 485 K and 〈β 〉θ is fitted to the experimental heat capacity data.
Phase transition	520 K	520	magnetic	experimental	[2] Naraghi 2014 cites Cohn 1953 doi	p. 3 report	Hägg carbide also appears to be ferromagnetic with a Curie temperature around 520 K [36].
Phase transition	653 K	653	magnetic	experimental	[2] Naraghi 2014 cites Cohn 1953 doi	p. 3 report	ε=η-Fe2 C carbide also appears to have ferromagnetic properties for which Cohn and Hofer [36] gave a Curie temperature around 653 K.
Phase transition	720 K	720	other	model	[2] Naraghi 2014	p. 9 report	The intersection of the lines for cementite and Hägg carbide defines the triple point between α/χ/θ below which Hägg carbide is more stable than cementite. Similarly the intersection of the Hägg and eta carbides gives the α/η/χ triple point below which eta carbide is more stable than Hägg carbide. In the present evaluation these points are located at 720 K and 470 K respectively according to the…

Sources

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

K. C. Hari Kumar, V. Raghavan, A Thermodynamic Analysis of the Al-C-Fe System, JPE 12, 275-286 (1991). doi:10.1007/bf02649916
Reza Naraghi, Malin Selleby, John Ågren, Thermodynamics of stable and metastable structures in Fe–C system, Calphad 46, 148-158 (2014). doi:10.1016/j.calphad.2014.03.004

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-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); 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); 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. 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_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}
}