C–Ta system

9 accepted literature values from 1 paper(s) (experimental 5, model 4); 0 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · phases (7) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	5
model	4

Accepted values by property group
Property group	Values
invariant reaction	6
phase transition	3

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull TaC-16Pan · CALPHAD hull TaC-96Fri-LB

Invariant reactions (literature)

Invariant reactions reported in the literature for the C–Ta system (6)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
3749	TaC + liq + gr	TaC: C 0.49; L: C 0.7; gr: C 1	model	[1] Frisk 1996	Table 2, p. 11, row 4 report
3718	TaC + liq + gr	TaC: C 0.5; L: C 0.61; gr: C 1	experimental	[1] Frisk 1996 cites Rudy 1966	Table 2, p. 11, row 3 report
3619	TaC + Ta2C + liq	TaC: C 0.38; Ta2C: C 0.333333; L: C 0.22	model	[1] Frisk 1996	Table 2, p. 11, row 6 report
3603	TaC + Ta2C + liq	TaC: C 0.38; Ta2C: C 0.333333; L: C 0.24	experimental	[1] Frisk 1996 cites Rudy 1966	Table 2, p. 11, row 5 report
3103	B.c.c. + Ta2C + liq	B.c.c.: C 0.07; Ta2C: C 0.26	experimental	[1] Frisk 1996 cites Storms 1967	Table 2, p. 11, row 7 report
3047	B.c.c. + Ta2C + liq	B.c.c.: C 0.081; Ta2C: C 0.28	model	[1] Frisk 1996	Table 2, p. 11, row 8 report

Other properties

Phase transition (3)

Phase transition, C–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	2273.15 K	2273.15	other	experimental	[1] Frisk 1996 cites Storms 1967	p. 2 report	A structure change in Ta2C x has been observed at 2000 °C which is due to an ordering of the C atoms [7].
Phase transition	4242 K	4242	Melting point of TaC TaC: C 0.4667; L: C 0.4667	model	[1] Frisk 1996	Table 2, p. 11, row 2 report
Phase transition	4256 K	4256	Melting point of TaC TaC: C 0.47; L: C 0.47	experimental	[1] Frisk 1996 cites Rudy 1966	Table 2, p. 11, row 1 report

Sources

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

K. Frisk, A. Fernández Guillermet, Gibbs energy coupling of the phase diagram and thermochemistry in the tantalum-carbon system, Journal of Alloys and Compounds 238, 167-179 (1996). doi:10.1016/0925-8388(96)02197-4

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}
}