Fe–Th system

57 accepted literature values from 1 paper(s) (experimental 27, model 30); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	27
model	30

Accepted values by property group
Property group	Values
invariant reaction	24
formation	33

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
FeTh-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	`ef83b175033c76d1ea9d36a93f37f95cf7f68cc4b0181470e90b72b25dbb244b`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
FeTh-08Wan.tdb	1685.38	BCC_A2 (x(Th) 4.000e-5) + LIQUID (x(Th) 0.0486) + FE17TH2 (x(Th) 0.10526)
FeTh-08Wan.tdb	1685.38	BCC_A2 (x(Th) 4.000e-5) + LIQUID (x(Th) 0.0485) + FE17TH2 (x(Th) 0.10526)
FeTh-08Wan.tdb	1667.5	BCC_A2 (x(Th) 3.000e-5) + FCC_A1 (x(Th) 4.000e-5) + FE17TH2 (x(Th) 0.10526)
FeTh-08Wan.tdb	1642.51	FE17TH2 (x(Th) 0.10526) + FE5TH_D2D (x(Th) 0.16667) + LIQUID (x(Th) 0.20505)
FeTh-08Wan.tdb	1642.51	FE17TH2 (x(Th) 0.10526) + FE5TH_D2D (x(Th) 0.16667) + LIQUID (x(Th) 0.20478)
FeTh-08Wan.tdb	1633.24	LIQUID (x(Th) 0.83693) + FCC_A1 (x(Th) 0.99915) + BCC_A2 (x(Th) 0.99916)
FeTh-08Wan.tdb	1633.24	LIQUID (x(Th) 0.83694) + FCC_A1 (x(Th) 0.99915) + BCC_A2 (x(Th) 0.99916)
FeTh-08Wan.tdb	1495.62	FE5TH_D2D (x(Th) 0.16667) + FE7TH2_BETA (x(Th) 0.22222) + LIQUID (x(Th) 0.32914)
FeTh-08Wan.tdb	1495.61	FE5TH_D2D (x(Th) 0.16667) + FE7TH2_BETA (x(Th) 0.22222) + LIQUID (x(Th) 0.32889)
FeTh-08Wan.tdb	1455.45	FE7TH2_ALPHA (x(Th) 0.22222) + FE7TH2_BETA (x(Th) 0.22222) + LIQUID (x(Th) 0.35345)
FeTh-08Wan.tdb	1455.45	FE5TH_D2D (x(Th) 0.16667) + FE7TH2_BETA (x(Th) 0.22222) + FE7TH2_ALPHA (x(Th) 0.22222)
FeTh-08Wan.tdb	1455.45	FE7TH2_BETA (x(Th) 0.22222) + FE7TH2_ALPHA (x(Th) 0.22222) + LIQUID (x(Th) 0.35365)
FeTh-08Wan.tdb	1374.59	FE7TH2_ALPHA (x(Th) 0.22222) + FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.4129)
FeTh-08Wan.tdb	1374.59	FE7TH2_ALPHA (x(Th) 0.22222) + FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.41268)
FeTh-08Wan.tdb	1374.59	FE7TH2_ALPHA (x(Th) 0.22222) + FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.41299)
FeTh-08Wan.tdb	1212.83	LIQUID (x(Th) 0.69843) + FE3TH7_D102 (x(Th) 0.7) + FCC_A1 (x(Th) 0.99951)
FeTh-08Wan.tdb	1212.83	LIQUID (x(Th) 0.69839) + FE3TH7_D102 (x(Th) 0.7) + FCC_A1 (x(Th) 0.99952)
FeTh-08Wan.tdb	1184.81	FCC_A1 (x(Th) 0) + BCC_A2 (x(Th) 0) + FE17TH2 (x(Th) 0.10526)
FeTh-08Wan.tdb	1128.23	FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.56228) + FE3TH7_D102 (x(Th) 0.7)
FeTh-08Wan.tdb	1128.23	FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.56246) + FE3TH7_D102 (x(Th) 0.7)
FeTh-08Wan.tdb	1128.23	FE3TH (x(Th) 0.25) + LIQUID (x(Th) 0.56261) + FE3TH7_D102 (x(Th) 0.7)
FeTh-08Wan.tdb	479.4	BCC_A2 (x(Th) 0) + FE17TH2 (x(Th) 0.10526) + FE5TH_D2D (x(Th) 0.16667)
FeTh-08Wan.tdb	461.04	FE7TH2_ALPHA (x(Th) 0.22222) + FE3TH (x(Th) 0.25) + FE3TH7_D102 (x(Th) 0.7)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Fe–Th system (24)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1811.15	congruent melting: L -> δFe	L: Th 0	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 1 report
1810.65	congruent melting: L -> δFe	L: Th 0	model	[1] Wang 2008	Table 4, p. 5, row 2 report
1735.55	congruent melting: L -> Fe17Th2	L: Th 0.105; Fe17Th2: Fe 0.894737, Th 0.105263	model	[1] Wang 2008	Table 4, p. 5, row 10 report
1735.15	congruent melting: L -> Fe17Th2	L: Th 0.105; Fe17Th2: Fe 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 9 report
1685.45	eutectic: L -> (αFe) + Fe17Th2	L: Th 0.0484; (αFe): Fe 0.777778, Th 0.222222; Fe17Th2: Fe 0.894737, Th 0.105263	model	[1] Wang 2008	Table 4, p. 5, row 8 report
1685.15	eutectic: L -> (αFe) + Fe17Th2	L: Th 0.05; (αFe): Fe 0.777778, Th 0.222222; Fe17Th2: Fe 0.894737, Th 0.105263	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 7 report
1667.45	polymorphic: δFe -> γFe	L: Th 0	model	[1] Wang 2008	Table 4, p. 5, row 4 report
1667.15	polymorphic: δFe -> γFe	L: Th 0	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 3 report
1643.15	peritectic: L + Fe17Th2 -> Fe5Th	L: Th 0.2; Fe17Th2: Fe 0.894737, Th 0.105263; Fe5Th: Fe 0.833333, Th 0.166667	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 11 report
1642.25	peritectic: L + Fe17Th2 -> Fe5Th	L: Th 0.2052; Fe17Th2: Fe 0.894737, Th 0.105263; Fe5Th: Fe 0.833333, Th 0.166667	model	[1] Wang 2008	Table 4, p. 5, row 12 report
1633.25	polymorphic: βTh -> αTh	αTh: Fe 0.777778, Th 0.222222; L: Th 1	model	[1] Wang 2008	Table 4, p. 5, row 26 report
1633.15	polymorphic: βTh -> αTh	αTh: Fe 0.777778, Th 0.222222; L: Th 1	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 25 report
1483.15	peritectic: L + Fe5Th -> βFe7Th2	L: Th 0.3; Fe5Th: Fe 0.833333, Th 0.166667; βFe7Th2: Fe 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 13 report
1482.85	peritectic: L + Fe5Th -> βFe7Th2	L: Th 0.3371; Fe5Th: Fe 0.833333, Th 0.166667; βFe7Th2: Fe 0.777778, Th 0.222222	model	[1] Wang 2008	Table 4, p. 5, row 14 report
1458.15	polymorphic: βFe7Th2 -> αFe7Th2	βFe7Th2: Fe 0.777778, Th 0.222222; αFe7Th2: Fe 0.777778, Th 0.222222	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 15 report
1457.45	polymorphic: βFe7Th2 -> αFe7Th2	βFe7Th2: Fe 0.777778, Th 0.222222; αFe7Th2: Fe 0.777778, Th 0.222222	model	[1] Wang 2008	Table 4, p. 5, row 16 report
1373.25	peritectic: L + aFe7Th2 -> Fe3Th	L: Th 0.4135; aFe7Th2: Fe 0.777778, Th 0.222222; Fe3Th: Fe 0.75, Th 0.25	model	[1] Wang 2008	Table 4, p. 5, row 18 report
1373.15	peritectic: L + aFe7Th2 -> Fe3Th	L: Th 0.41; aFe7Th2: Fe 0.777778, Th 0.222222; Fe3Th: Fe 0.75, Th 0.25	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 17 report
1213.15	peritectic: L + (αTh) -> Fe3Th7	L: Th 0.69; (αTh): Fe 0.777778, Th 0.222222; Fe3Th7: Fe 0.3, Th 0.7	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 21 report
1212.65	peritectic: L + (αTh) -> Fe3Th7	L: Th 0.6985; (αTh): Fe 0.777778, Th 0.222222; Fe3Th7: Fe 0.3, Th 0.7	model	[1] Wang 2008	Table 4, p. 5, row 22 report
1185.15	polymorphic: γFe -> αFe	αFe: Fe 0.777778, Th 0.222222; L: Th 0	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 5 report
1184.85	polymorphic: γFe -> αFe	αFe: Fe 0.777778, Th 0.222222; L: Th 0	model	[1] Wang 2008	Table 4, p. 5, row 6 report
1127.95	eutectic: L -> Fe3Th + Fe3Th7	L: Th 0.5624; Fe3Th: Fe 0.75, Th 0.25; Fe3Th7: Fe 0.3, Th 0.7	model	[1] Wang 2008	Table 4, p. 5, row 20 report
1123.15	eutectic: L -> Fe3Th + Fe3Th7	L: Th 0.54; Fe3Th: Fe 0.75, Th 0.25; Fe3Th7: Fe 0.3, Th 0.7	experimental	[1] Wang 2008 cites Palenzona 1989 doi	Table 4, p. 5, row 19 report

Other properties

Formation (33)

Formation, Fe–Th system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Gibbs energy of formation printed: ΔfG	-9.877 per mol-atom	973	Fe17Th2 alloy: Th 0.105263	model	[1] Wang 2008	Table 5, p. 5, row 2 report
Gibbs energy of formation printed: ΔfG	-7.664 per mol-atom ± 0.168	973	Fe17Th2 alloy: Th 0.105263	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 1 report
Gibbs energy of formation printed: ΔfG	-12.6 per mol-atom ± 0.42	973	Fe3Th alloy: Th 0.25	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 22 report
Gibbs energy of formation printed: ΔfG	-13.306 per mol-atom	973	Fe3Th alloy: Th 0.25	model	[1] Wang 2008	Table 5, p. 5, row 23 report
Gibbs energy of formation printed: ΔfG	-8.396 per mol-atom	973	Fe3Th7 alloy: Th 0.7	model	[1] Wang 2008	Table 5, p. 5, row 29 report
Gibbs energy of formation printed: ΔfG	-6.72 per mol-atom ± 1.134	973	Fe3Th7 alloy: Th 0.7	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 28 report
Gibbs energy of formation printed: ΔfG	-10.962 per mol-atom ± 0.252	973	Fe5Th alloy: Th 0.166667	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 7 report
Gibbs energy of formation printed: ΔfG	-12.361 per mol-atom	973	Fe5Th alloy: Th 0.166667	model	[1] Wang 2008	Table 5, p. 5, row 8 report
Gibbs energy of formation printed: ΔfG	-13.186 per mol-atom	973	αFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 14 report
Gibbs energy of formation printed: ΔfG	-11.97 per mol-atom ± 0.378	973	αFe7Th2 alloy: Th 0.222222	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 13 report
Gibbs energy of formation printed: ΔfG	-10.673 per mol-atom	973	βFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 19 report
Gibbs energy of formation printed: ΔfG	-9.867 per mol-atom	1000	Fe17Th2 alloy: Th 0.105263	model	[1] Wang 2008	Table 5, p. 5, row 6 report
Gibbs energy of formation printed: ΔfG	-8.046 per mol-atom	1000	Fe17Th2 alloy: Th 0.105263	experimental	[1] Wang 2008 cites Chiotti 1981	Table 5, p. 5, row 5 report
Gibbs energy of formation printed: ΔfG	-12.878 per mol-atom	1000	Fe3Th alloy: Th 0.25	experimental	[1] Wang 2008 cites Chiotti 1981	Table 5, p. 5, row 26 report
Gibbs energy of formation printed: ΔfG	-13.29 per mol-atom	1000	Fe3Th alloy: Th 0.25	model	[1] Wang 2008	Table 5, p. 5, row 27 report
Gibbs energy of formation printed: ΔfG	-7.004 per mol-atom	1000	Fe3Th7 alloy: Th 0.7	experimental	[1] Wang 2008 cites Chiotti 1981	Table 5, p. 5, row 32 report
Gibbs energy of formation printed: ΔfG	-8.363 per mol-atom	1000	Fe3Th7 alloy: Th 0.7	model	[1] Wang 2008	Table 5, p. 5, row 33 report
Gibbs energy of formation printed: ΔfG	-12.351 per mol-atom	1000	Fe5Th alloy: Th 0.166667	model	[1] Wang 2008	Table 5, p. 5, row 12 report
Gibbs energy of formation printed: ΔfG	-11.234 per mol-atom	1000	Fe5Th alloy: Th 0.166667	experimental	[1] Wang 2008 cites Chiotti 1981	Table 5, p. 5, row 11 report
Gibbs energy of formation printed: ΔfG	-13.17 per mol-atom	1000	αFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 18 report
Gibbs energy of formation printed: ΔfG	-12.447 per mol-atom	1000	αFe7Th2 alloy: Th 0.222222	experimental	[1] Wang 2008 cites Chiotti 1981	Table 5, p. 5, row 17 report
Gibbs energy of formation printed: ΔfG	-10.797 per mol-atom	1000	βFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 21 report
Gibbs energy of formation printed: ΔfG	-9.823 per mol-atom	1123	Fe17Th2 alloy: Th 0.105263	model	[1] Wang 2008	Table 5, p. 5, row 4 report
Gibbs energy of formation printed: ΔfG	-6.888 per mol-atom ± 0.168	1123	Fe17Th2 alloy: Th 0.105263	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 3 report
Gibbs energy of formation printed: ΔfG	-13.215 per mol-atom	1123	Fe3Th alloy: Th 0.25	model	[1] Wang 2008	Table 5, p. 5, row 25 report
Gibbs energy of formation printed: ΔfG	-10.71 per mol-atom ± 0.462	1123	Fe3Th alloy: Th 0.25	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 24 report
Gibbs energy of formation printed: ΔfG	-6.972 per mol-atom ± 1.176	1123	Fe3Th7 alloy: Th 0.7	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 30 report
Gibbs energy of formation printed: ΔfG	-8.212 per mol-atom	1123	Fe3Th7 alloy: Th 0.7	model	[1] Wang 2008	Table 5, p. 5, row 31 report
Gibbs energy of formation printed: ΔfG	-12.308 per mol-atom	1123	Fe5Th alloy: Th 0.166667	model	[1] Wang 2008	Table 5, p. 5, row 10 report
Gibbs energy of formation printed: ΔfG	-9.702 per mol-atom ± 0.252	1123	Fe5Th alloy: Th 0.166667	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 9 report
Gibbs energy of formation printed: ΔfG	-13.097 per mol-atom	1123	αFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 16 report
Gibbs energy of formation printed: ΔfG	-10.29 per mol-atom ± 0.42	1123	αFe7Th2 alloy: Th 0.222222	experimental	[1] Wang 2008 cites Skelton 1973 doi	Table 5, p. 5, row 15 report
Gibbs energy of formation printed: ΔfG	-11.363 per mol-atom	1123	βFe7Th2 alloy: Th 0.222222	model	[1] Wang 2008	Table 5, p. 5, row 20 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}
}