Co–Mg system

11 accepted literature values from 2 paper(s) (experimental 9, model 2); 1 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
model	2

Accepted values by property group
Property group	Values
invariant reaction	5
phase equilibrium	5
formation	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
CoMg-22Yan.tdb	L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022). doi:10.2298/JMMB210606051Y	`edaa24ff0861bcf5be4019caf839f602c299f43fa30a18bd3d37c0d0523c0974`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoMg-22Yan.tdb	1242.77	FCC_A1 (x(Mg) 0.00272) + CO2MG_C14 (x(Mg) 0.33333) + LIQUID (x(Mg) 0.72271)
CoMg-22Yan.tdb	1242.77	FCC_A1 (x(Mg) 0.00272) + CO2MG_C14 (x(Mg) 0.33333) + LIQUID (x(Mg) 0.7225)
CoMg-22Yan.tdb	909.23	CO2MG_C14 (x(Mg) 0.33333) + LIQUID (x(Mg) 0.98193) + HCP_A3 (x(Mg) 0.99928)
CoMg-22Yan.tdb	909.23	CO2MG_C14 (x(Mg) 0.33333) + LIQUID (x(Mg) 0.98198) + HCP_A3 (x(Mg) 0.99928)
CoMg-22Yan.tdb	695.06	FCC_A1 (x(Mg) 1.000e-5) + HCP_A3 (x(Mg) 2.000e-5) + CO2MG_C14 (x(Mg) 0.33333)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Mg system (5)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1243.15	L + (αCo) -> MgCo2	MgCo2: Mg 0.333333	experimental	[1] Yang 2022 cites Smith 1964	Table 3, p. 4, row 4 report
1243.01	L + (αCo) -> MgCo2	MgCo2: Mg 0.333333	model	[1] Yang 2022	Table 3, p. 4, row 5 report
908.15	eutectic: L -> (Mg) + MgCo2	MgCo2: Mg 0.333333	experimental	[1] Yang 2022 cites Wetherill 1935	Table 3, p. 4, row 1 report
908.07	eutectic: L -> (Mg) + MgCo2	MgCo2: Mg 0.333333	model	[1] Yang 2022	Table 3, p. 4, row 3 report
906.15	eutectic: L -> (Mg) + MgCo2	MgCo2: Mg 0.333333	experimental	[1] Yang 2022 cites Cramer 1947	Table 3, p. 4, row 2 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Co–Mg system (1)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
MgCo2	Co2Mg	-8 kJ/mol-atom	800	experimental	-3.198 (mp-aaabxfmp)	-3.729 (oqmd-2066444)	[1] Yang 2022 cites Hultgren 1973	p. 2 report	According to Hultgren et al. [25], the enthalpy of formation of MgCo2 was determined to be -8 kJ/mole·atoms at 800 K by vapor-pressure measurement.

Other properties

Phase equilibrium (5)

Phase equilibrium, Co–Mg system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition	911.35	other liquid: Co 0.0165, Mg 0.9835	experimental	[2] Sheldon 1987 cites ref. 35Wet	Table 1, p. 6, row 13 report
Phase composition	911.65	other liquid: Co 0.0199, Mg 0.9801	experimental	[2] Sheldon 1987 cites ref. 35Wet	Table 1, p. 6, row 14 report
Phase composition	916.95	other liquid: Co 0.0077, Mg 0.9923	experimental	[2] Sheldon 1987 cites ref. 35Wet	Table 1, p. 6, row 12 report
Phase composition	920.15	other liquid: Co 0.0042, Mg 0.9958	experimental	[2] Sheldon 1987 cites ref. 47Cra	Table 1, p. 6, row 15 report
Phase composition	923.65	other liquid: Co 0.0013, Mg 0.9987	experimental	[2] Sheldon 1987 cites ref. 35Wet	Table 1, p. 6, row 11 report

Sources

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

L.-F. Yang, X-D. Si, H.-D. Zhang, F.-G. Gao, Y.-P. Zeng, Y.-L. Liu et al., Thermodynamic assessment of the Co-Mg binary system, J min metall B Metall 58, 109-115 (2022). doi:10.2298/jmmb210606051y
R. I. Sheldon, E. M. Foltyn, D. E. Peterson, The Sn-U (Tin-Uranium) system, Bulletin of Alloy Phase Diagrams 8, 347-352 (1987). doi:10.1007/bf02869271

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}
}