Co–Th system

41 accepted literature values from 1 paper(s) (experimental 27, model 14); 1 calculated phase diagram(s). 4 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 (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	27
model	14

Accepted values by property group
Property group	Values
invariant reaction	41

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
CoTh-08Wan.tdb	C.P. Wang, P. Yu, X.J. Liu, I. Ohnuma, R. Kainuma, K. Ishida, J. Alloys Compd., 457, 150-56(2008). doi:10.1016/j.jallcom.2007.03.003	`97db96e3dea38a8a099b345f73c87e368aa88b82854de7a13e784c6b26276be6`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoTh-08Wan.tdb	1697.6	CO17TH2 (x(Th) 0.10526) + LIQUID (x(Th) 0.15764) + CO5TH_D2D (x(Th) 0.16667)
CoTh-08Wan.tdb	1697.6	CO17TH2 (x(Th) 0.10526) + LIQUID (x(Th) 0.15753) + CO5TH_D2D (x(Th) 0.16667)
CoTh-08Wan.tdb	1679.46	FCC_A1 (x(Th) 0) + LIQUID (x(Th) 0.0437) + CO17TH2 (x(Th) 0.10526)
CoTh-08Wan.tdb	1633.2	LIQUID (x(Th) 0.8737) + BCC_A2 (x(Th) 0.99999) + FCC_A1 (x(Th) 0.99999)
CoTh-08Wan.tdb	1633.2	LIQUID (x(Th) 0.87385) + FCC_A1 (x(Th) 0.99999) + BCC_A2 (x(Th) 0.99999)
CoTh-08Wan.tdb	1357.73	CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.79286) + FCC_A1 (x(Th) 1)
CoTh-08Wan.tdb	1357.73	CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.79279) + FCC_A1 (x(Th) 1)
CoTh-08Wan.tdb	1357.73	CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.7929) + FCC_A1 (x(Th) 1)
CoTh-08Wan.tdb	1298.24	COTH_B33 (x(Th) 0.5) + LIQUID (x(Th) 0.58761) + CO3TH7_D102 (x(Th) 0.7)
CoTh-08Wan.tdb	1298.24	COTH_B33 (x(Th) 0.5) + LIQUID (x(Th) 0.58775) + CO3TH7_D102 (x(Th) 0.7)
CoTh-08Wan.tdb	1233.31	CO7TH2_ALPHA (x(Th) 0.22222) + LIQUID (x(Th) 0.3948) + COTH_B33 (x(Th) 0.5)
CoTh-08Wan.tdb	694.99	FCC_A1 (x(Th) 0) + HCP_A3 (x(Th) 0) + CO17TH2 (x(Th) 0.10526)
CoTh-08Wan.tdb	400.45	CO17TH2 (x(Th) 0.10526) + CO5TH_D2D (x(Th) 0.16667) + CO7TH2_ALPHA (x(Th) 0.22222)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Th system (41)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1768.15	congruent melting: L <-> αCo	L: Th 0; αCo: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 39 report
1768.15	congruent melting: L <-> αCo	L: Th 0; αCo: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 40 report
1766.85	congruent melting: L <-> αCo	L: Th 0; αCo: Co 0.777778, Th 0.222222	model	[1] Wang 2008	Table 2, p. 3, row 41 report
1735.15	congruent melting: L <-> Co17Th2	L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 33 report
1733.65	congruent melting: L <-> Co17Th2	L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263	model	[1] Wang 2008	Table 2, p. 3, row 35 report
1733.15	congruent melting: L <-> Co17Th2	L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 34 report
1710.15	congruent melting: L <-> Co5Th	L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 27 report
1698.35	congruent melting: L <-> Co5Th	L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667	model	[1] Wang 2008	Table 2, p. 3, row 29 report
1698.15	congruent melting: L <-> Co5Th	L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 28 report
1696.95	eutectic: L <-> Co5Th + Co17Th2	L: Th 0.1555; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263	model	[1] Wang 2008	Table 2, p. 3, row 32 report
1683.15	eutectic: L <-> Co17Th2 + αCo	L: Th 0.0501; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 37 report
1678.05	eutectic: L <-> Co17Th2 + αCo	L: Th 0.0456; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222	model	[1] Wang 2008	Table 2, p. 3, row 38 report
1660.15	eutectic: L <-> Co17Th2 + αCo	L: Th 0.0501; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 36 report
1633.25	polymorphic: βTh <-> αTh	αTh: Co 0.777778, Th 0.222222; L: Th 1	model	[1] Wang 2008	Table 2, p. 3, row 6 report
1633.15	polymorphic: βTh <-> αTh	αTh: Co 0.777778, Th 0.222222; L: Th 1	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 4 report
1633.15	polymorphic: βTh <-> αTh	αTh: Co 0.777778, Th 0.222222; L: Th 1	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 5 report
1573.15	eutectic: L <-> Co5Th + Co17Th2	L: Th 0.1202; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 30 report
1573.15	eutectic: L <-> Co5Th + Co17Th2	L: Th 0.1258; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 31 report
1461.15	congruent melting: L <-> Co3Th7	L: Th 0.7; Co3Th7: Co 0.3, Th 0.7	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 10 report
1410.15	congruent melting: L <-> CoTh	L: Th 0.5; CoTh: Co 0.5, Th 0.5	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 16 report
1403.15	congruent melting: L <-> Co3Th7	L: Th 0.7; Co3Th7: Co 0.3, Th 0.7	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 11 report
1402.85	congruent melting: L <-> Co3Th7	L: Th 0.7; Co3Th7: Co 0.3, Th 0.7	model	[1] Wang 2008	Table 2, p. 3, row 12 report
1398.15	peritectic: L + Co5Th <-> βCo7Th2	L: Th 0.3187; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 25 report
1398.15	peritectic: L + Co5Th <-> βCo7Th2	L: Th 0.256; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 24 report
1398.15	peritectic: L + Co5Th <-> βCo7Th2	L: Th 0.3324; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222	model	[1] Wang 2008	Table 2, p. 3, row 26 report
1398.15	congruent melting: L <-> CoTh	L: Th 0.5; CoTh: Co 0.5, Th 0.5	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 17 report
1397.95	congruent melting: L <-> CoTh	L: Th 0.5; CoTh: Co 0.5, Th 0.5	model	[1] Wang 2008	Table 2, p. 3, row 18 report
1373.25	polymorphic: βCo7Th2 <-> αCo7Th2	βCo7Th2: Co 0.777778, Th 0.222222; αCo7Th2: Co 0.777778, Th 0.222222	model	[1] Wang 2008	Table 2, p. 3, row 23 report
1373.15	polymorphic: βCo7Th2 <-> αCo7Th2	βCo7Th2: Co 0.777778, Th 0.222222; αCo7Th2: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 22 report
1373.15	eutectic: L <-> αTh + Co3Th7	L: Th 0.7961; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 8 report
1373.15	eutectic: L <-> αTh + Co3Th7	L: Th 0.7966; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 7 report
1358.05	eutectic: L <-> αTh + Co3Th7	L: Th 0.793; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7	model	[1] Wang 2008	Table 2, p. 3, row 9 report
1310.15	eutectic: L <-> Co3Th7 + CoTh	L: Th 0.5976; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 13 report
1298.45	eutectic: L <-> Co3Th7 + CoTh	L: Th 0.5875; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5	model	[1] Wang 2008	Table 2, p. 3, row 15 report
1298.15	eutectic: L <-> Co3Th7 + CoTh	L: Th 0.619; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 14 report
1248.15	eutectic: L <-> CoTh + αCo7Th2	L: Th 0.3808; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 19 report
1233.25	eutectic: L <-> CoTh + αCo7Th2	L: Th 0.3941; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222	model	[1] Wang 2008	Table 2, p. 3, row 21 report
1233.15	eutectic: L <-> CoTh + αCo7Th2	L: Th 0.3907; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 20 report
695.15	polymorphic: αCo <-> εCo	αCo: Co 0.777778, Th 0.222222; L: Th 0	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 2, p. 3, row 43 report
695.15	polymorphic: αCo <-> εCo	αCo: Co 0.777778, Th 0.222222; L: Th 0	experimental	[1] Wang 2008 cites Thomson 1966 doi	Table 2, p. 3, row 42 report
694.95	polymorphic: αCo <-> εCo	αCo: Co 0.777778, Th 0.222222; L: Th 0	model	[1] Wang 2008	Table 2, p. 3, row 44 report

Sources

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

C.P. Wang, P. Yu, X.J. Liu, I. Ohnuma, R. Kainuma, K. Ishida, Thermodynamic assessment of the Co–Th and Fe–Th systems, Journal of Alloys and Compounds 457, 150-156 (2008). doi:10.1016/j.jallcom.2007.03.003

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}
}