Cu–Ta system

4 accepted literature values from 1 paper(s) (experimental 1, model 1, unspecified 2); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (4) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	1
model	1
unspecified	2

Accepted values by property group
Property group	Values
invariant reaction	3
mixing / partial	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
CuTa-15Liu.tdb	X. Liu, W. Huang, Y. Guo, S. Yang, Y. Lu, C. Wang, J. Phase Equilib. Diffus., 36, 28-38(2015). doi:10.1007/s11669-014-0349-z	`bfd1010edb6219a6f3bc87325d9264ea5ee40ba654974d6357d11795094944e2`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuTa-15Liu.tdb	1338.7	FCC_A1 (x(Ta) 7.000e-5) + LIQUID (x(Ta) 0.01809) + BCC_A2 (x(Ta) 0.99894)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–Ta system (3)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1356.15	eutectic: Liquid <-> (Cu) + (Ta)	Liquid: Ta 0; (Cu): Ta 0; (Ta): Ta 1	unspecified	[1] Liu 2015 cites Subramanian 1989 doi	Table 3, p. 6, row 1 report
1345.15	eutectic: Liquid <-> (Cu) + (Ta)	Liquid: Ta 0.012; (Cu): Ta 0; (Ta): Ta 1	experimental	[1] Liu 2015 cites Subramanian 1994	Table 3, p. 6, row 2 report
1338.85	eutectic: Liquid <-> (Cu) + (Ta)	Liquid: Ta 0.018; (Cu): Ta 0; (Ta): Ta 1	unspecified	[1] Liu 2015	Table 3, p. 6, row 3 report

Other properties

Mixing / partial (1)

Mixing / partial, Cu–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Enthalpy of mixing printed: enthalpy of mixing	2.38 kJ/mol (basis unstated)	3773.15		model	[1] Liu 2015	p. 7 report	The liquid-phase enthalpy of mixing in the Cu-Ta binary system at 3500 C was calculated, as presented in Fig. 5. The calculated value at 50 at.% Ta is 2.38 kJ/mol, which is close to the predicted value of 2 kJ/mol.[17]

Sources

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

Xingjun Liu, Wenliang Huang, Yihui Guo, Shuiyuan Yang, Yong Lu, Cuiping Wang, Experimental Investigation and Thermodynamic Calculation of the Phase Equilibria in the Cu-Fe-Ta System, J. Phase Equilib. Diffus. 36, 28-38 (2015). doi:10.1007/s11669-014-0349-z

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}
}