Co–Mo system

30 accepted literature values from 2 paper(s) (experimental 3, model 27); 4 calculated phase diagram(s). 6 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 (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	3
model	27

Accepted values by property group
Property group	Values
phase transition	1
formation	24
crystal structure	4
other property	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
CoMo-03Dav-LB.tdb	A.V. Davydov, U.R. Kattner, J. Phase Equilib., 24, 209-11(2003). doi:10.1361/105497103770330505	`a58bcde388de52ca787042e3bbede86b89ecc920190442e74cb4b02c718032ce`	viewer · TDB · JSON
CoMo-03Dav-alt.tdb	A.V. Davydov, U.R. Kattner, J. Phase Equilib., 24, 209-11(2003). doi:10.1361/105497103770330505	`2d6edda32b27d42016492f79b67429c5ec8925e693aa03c73377fc7e643f08ca`	viewer · TDB · JSON
CoMo-99Dav-alt.tdb	A.V. Davydov, U.R. Kattner, J. Phase Equilib., 20, 5-16(1999). doi:10.1361/105497199770335893	`d2c8829a651a1f9bd69f86292bf18dd5b801fcee9738d033b99ed9fb03167e6f`	viewer · TDB · JSON
CoMo-99Dav.tdb	A.V. Davydov, U.R. Kattner, J. Phase Equilib., 20, 5-16(1999). doi:10.1361/105497199770335893	`7aa9e898710f4b977ba05d71fc46f420228e736225f1cb33d67496687aaf496e`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoMo-03Dav-LB.tdb	1891.55	LIQUID (x(Mo) 0.46736) + SIGMA_D8B (x(Mo) 0.63405) + BCC_A2 (x(Mo) 0.9339)
CoMo-03Dav-LB.tdb	1787.02	LIQUID (x(Mo) 0.39979) + MU_D85 (x(Mo) 0.48257) + SIGMA_D8B (x(Mo) 0.62346)
CoMo-03Dav-LB.tdb	1609.78	FCC_A1 (x(Mo) 0.18649) + LIQUID (x(Mo) 0.24429) + MU_D85 (x(Mo) 0.44299)
CoMo-03Dav-LB.tdb	1474.4	FCC_A1 (x(Mo) 0.16391) + HCP_A3 (x(Mo) 0.19681) + MU_D85 (x(Mo) 0.43095)
CoMo-03Dav-LB.tdb	1320.37	HCP_A3 (x(Mo) 0.18444) + CO3MO_D019 (x(Mo) 0.25) + MU_D85 (x(Mo) 0.4119)
CoMo-03Dav-LB.tdb	1290.94	FCC_A1 (x(Mo) 0.12302) + HCP_A3 (x(Mo) 0.16359) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-LB.tdb	1290.94	FCC_A1 (x(Mo) 0.12301) + HCP_A3 (x(Mo) 0.16358) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-LB.tdb	1271	MU_D85 (x(Mo) 0.49195) + SIGMA_D8B (x(Mo) 0.64346) + BCC_A2 (x(Mo) 0.98756)
CoMo-03Dav-LB.tdb	1142.51	FCC_A1 (x(Mo) 0.02878) + FCC_A1#2 (x(Mo) 0.0604) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-LB.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01279) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-LB.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01277) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-alt.tdb	1891.95	LIQUID (x(Mo) 0.46748) + SIGMA_OLD (x(Mo) 0.63946) + BCC_A2 (x(Mo) 0.9339)
CoMo-03Dav-alt.tdb	1785.92	LIQUID (x(Mo) 0.39891) + MU_D85 (x(Mo) 0.48246) + SIGMA_OLD (x(Mo) 0.61706)
CoMo-03Dav-alt.tdb	1609.77	FCC_A1 (x(Mo) 0.18652) + LIQUID (x(Mo) 0.24432) + MU_D85 (x(Mo) 0.44263)
CoMo-03Dav-alt.tdb	1474.39	FCC_A1 (x(Mo) 0.1639) + HCP_A3 (x(Mo) 0.19681) + MU_D85 (x(Mo) 0.43082)
CoMo-03Dav-alt.tdb	1320.71	HCP_A3 (x(Mo) 0.18471) + CO3MO_D019 (x(Mo) 0.25) + MU_D85 (x(Mo) 0.41361)
CoMo-03Dav-alt.tdb	1290.94	FCC_A1 (x(Mo) 0.12302) + HCP_A3 (x(Mo) 0.16359) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-alt.tdb	1290.94	FCC_A1 (x(Mo) 0.12301) + HCP_A3 (x(Mo) 0.16358) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-alt.tdb	1271.73	MU_D85 (x(Mo) 0.49553) + SIGMA_OLD (x(Mo) 0.65039) + BCC_A2 (x(Mo) 0.98753)
CoMo-03Dav-alt.tdb	1142.51	FCC_A1 (x(Mo) 0.02878) + FCC_A1#2 (x(Mo) 0.0604) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-alt.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01279) + CO3MO_D019 (x(Mo) 0.25)
CoMo-03Dav-alt.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01277) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav-alt.tdb	1892.88	LIQUID (x(Mo) 0.50066) + SIGMA_OLD (x(Mo) 0.64154) + BCC_A2 (x(Mo) 0.93032)
CoMo-99Dav-alt.tdb	1782.88	LIQUID (x(Mo) 0.43413) + MU_D85 (x(Mo) 0.48125) + SIGMA_OLD (x(Mo) 0.6152)
CoMo-99Dav-alt.tdb	1608.27	FCC_A1 (x(Mo) 0.18678) + LIQUID (x(Mo) 0.26886) + MU_D85 (x(Mo) 0.4426)
CoMo-99Dav-alt.tdb	1473.3	FCC_A1 (x(Mo) 0.16359) + HCP_A3 (x(Mo) 0.1966) + MU_D85 (x(Mo) 0.42993)
CoMo-99Dav-alt.tdb	1319.15	HCP_A3 (x(Mo) 0.18347) + CO3MO_D019 (x(Mo) 0.25) + MU_D85 (x(Mo) 0.41059)
CoMo-99Dav-alt.tdb	1290.94	FCC_A1 (x(Mo) 0.12302) + HCP_A3 (x(Mo) 0.16359) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav-alt.tdb	1290.94	FCC_A1 (x(Mo) 0.123) + HCP_A3 (x(Mo) 0.16358) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav-alt.tdb	1272.92	MU_D85 (x(Mo) 0.49452) + SIGMA_OLD (x(Mo) 0.64458) + BCC_A2 (x(Mo) 0.98668)
CoMo-99Dav-alt.tdb	1142.51	FCC_A1 (x(Mo) 0.02878) + FCC_A1#2 (x(Mo) 0.0604) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav-alt.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01279) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav-alt.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01277) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav.tdb	1892.98	LIQUID (x(Mo) 0.50068) + SIGMA_D8B (x(Mo) 0.63797) + BCC_A2 (x(Mo) 0.93032)
CoMo-99Dav.tdb	1782.81	LIQUID (x(Mo) 0.43547) + MU_D85 (x(Mo) 0.48194) + SIGMA_D8B (x(Mo) 0.62846)
CoMo-99Dav.tdb	1608.3	FCC_A1 (x(Mo) 0.18674) + LIQUID (x(Mo) 0.26883) + MU_D85 (x(Mo) 0.44208)
CoMo-99Dav.tdb	1473	FCC_A1 (x(Mo) 0.1635) + HCP_A3 (x(Mo) 0.19654) + MU_D85 (x(Mo) 0.42962)
CoMo-99Dav.tdb	1318.99	HCP_A3 (x(Mo) 0.18334) + CO3MO_D019 (x(Mo) 0.25) + MU_D85 (x(Mo) 0.40996)
CoMo-99Dav.tdb	1290.94	FCC_A1 (x(Mo) 0.12302) + HCP_A3 (x(Mo) 0.16359) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav.tdb	1290.94	FCC_A1 (x(Mo) 0.123) + HCP_A3 (x(Mo) 0.16357) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav.tdb	1272.87	MU_D85 (x(Mo) 0.49136) + SIGMA_D8B (x(Mo) 0.63775) + BCC_A2 (x(Mo) 0.98668)
CoMo-99Dav.tdb	1142.51	FCC_A1 (x(Mo) 0.02878) + FCC_A1#2 (x(Mo) 0.0604) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01279) + CO3MO_D019 (x(Mo) 0.25)
CoMo-99Dav.tdb	804.5	FCC_A1 (x(Mo) 0.00184) + HCP_A3 (x(Mo) 0.01277) + CO3MO_D019 (x(Mo) 0.25)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CoMo-03Dav-alt · CALPHAD hull CoMo-99Dav-alt · CALPHAD hull CoMo-99Dav

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–Mo system (12)
Phase	Value	T (K)	Class	Source	Location
ε	-5.36 kJ/mol-atom	298.15	model	[1] Davydov 2003	Table 2, p. 3, row 1 report
ε	-5.36 kJ/mol-atom	298.15	model	[2] Davydov 1999	Table 5, p. 10, row 1 report
ε	-5.3 kJ/mol-atom ± 1.2	298.15	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 2 report
ε	-5.3 kJ/mol-atom ± 1.2	298.15	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 2 report
μ	-3.8 kJ/mol-atom ± 0.4	298.15	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 4 report
μ	-3.8 kJ/mol-atom ± 0.4	298.15	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 4 report
μ	-3.53 kJ/mol-atom	298.15	model	[2] Davydov 1999	Table 5, p. 10, row 3 report
μ	-3.434 kJ/mol-atom	298.15	model	[1] Davydov 2003	Table 2, p. 3, row 3 report
σ	-1.9 kJ/mol-atom ± 2.5	298.15	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 6 report
σ	-1.9 kJ/mol-atom ± 2.5	298.15	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 6 report
σ	-0.94 kJ/mol-atom	298.15	model	[2] Davydov 1999	Table 5, p. 10, row 5 report
σ	-0.711 kJ/mol-atom	298.15	model	[1] Davydov 2003	Table 2, p. 3, row 5 report

Other properties

Phase transition (1)

Phase transition, Co–Mo system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1514 K	1514	other	experimental	[2] Davydov 1999 cites Kubaschewski 1983	p. 3 report	The latter study revealed several nonequilibrium thermal transformations in the intermetallics, not verified in other works, such as a transition in the σ phase at 1514 K, where according to Fig. 1 no phase change should occur.

Formation (12)

Formation, Co–Mo system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy of formation printed: ΔfS298	0.1 unknown	298.15	ε alloy: Co 0.75, Mo 0.25	model	[1] Davydov 2003	Table 2, p. 3, row 1 report
Entropy of formation printed: ΔfS298	-1.3 unknown ± 0.8	298.15	ε alloy: Co 0.75, Mo 0.25	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 2 report
Entropy of formation printed: ΔfS298	0.1 J/mol-atom/K	298.15	ε alloy: Mo 0.25	model	[2] Davydov 1999	Table 5, p. 10, row 1 report
Entropy of formation printed: ΔfS^298	-1.3 J/mol-atom/K ± 0.8	298.15	ε alloy: Mo 0.25	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 2 report
Entropy of formation printed: ΔfS298	2.5 unknown	298.15	μ alloy: Co 0.52, Mo 0.48	model	[1] Davydov 2003	Table 2, p. 3, row 3 report
Entropy of formation printed: ΔfS298	1.8 unknown ± 0.8	298.15	μ alloy: Co 0.52, Mo 0.48	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 4 report
Entropy of formation printed: ΔfS298	1.8 J/mol-atom/K ± 0.8	298.15	μ alloy: Mo 0.48	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 4 report
Entropy of formation printed: ΔfS^298	2.4 J/mol-atom/K	298.15	μ alloy: Mo 0.48	model	[2] Davydov 1999	Table 5, p. 10, row 3 report
Entropy of formation printed: ΔfS298	2.1 J/mol-atom/K	298.15	σ alloy: Co 0.37, Mo 0.63	model	[1] Davydov 2003	Table 2, p. 3, row 5 report
Entropy of formation printed: ΔfS298	3.3 unknown ± 1.2	298.15	σ alloy: Co 0.37, Mo 0.63	model	[1] Davydov 2003 cites Brewer 1980 doi	Table 2, p. 3, row 6 report
Entropy of formation printed: ΔfS^298	3.3 J/mol-atom/K ± 1.2	298.15	σ alloy: Mo 0.63	model	[2] Davydov 1999 cites Brewer 1980	Table 5, p. 10, row 6 report
Entropy of formation printed: ΔfS298	3 J/mol-atom/K	298.15	σ alloy: Mo 0.63	model	[2] Davydov 1999	Table 5, p. 10, row 5 report

Crystal structure (4)

Crystal structure, Co–Mo system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	2.567 not_printed	298.15	cph (Co) alloy: Mo 0	model	[2] Davydov 1999 cites Predel 1993	Table 2, p. 2, row 1 report
Lattice a	2.597 not_printed	298.15	θ	experimental	[2] Davydov 1999 cites Quinn 1963 doi	Table 2, p. 2, row 2 report
Lattice c	4.113 not_printed	298.15	cph (Co) alloy: Mo 0	model	[2] Davydov 1999 cites Predel 1993	Table 2, p. 2, row 1 report
Lattice c	4.212 not_printed	298.15	θ	experimental	[2] Davydov 1999 cites Quinn 1963 doi	Table 2, p. 2, row 2 report

Other property (1)

Other property, Co–Mo system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Other printed: 0βfcc Co	1.35 unspecified	1396		model	[2] Davydov 1999 cites Dinsdale 1991 doi	p. 9 report	where the magnetic properties of pure Co are: 0βfcc Co = 1.35 and 0T fcc = 1396 K [91Din].

Sources

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

A. V. Davydov, U. R. Kattner, Revised thermodynamic description for the Co-Mo system, JPE 24, 209-211 (2003). doi:10.1361/105497103770330505
A. Davydov, U. R. Kattner, Thermodynamic assessment of the Co-Mo system, JPE 20, 5-16 (1999). doi:10.1361/105497199770335893

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}
}