Re–Ta system

38 accepted literature values from 2 paper(s) (experimental 25, model 5, unspecified 8); 3 calculated phase diagram(s). 3 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	25
model	5
unspecified	8

Accepted values by property group
Property group	Values
invariant reaction	18
phase transition	3
phase equilibrium	12
formation	5

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
ReTa-00Liu-LB.tdb	Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000). doi:10.1016/S0925-8388(99)00597-6	`a7ace7884aafa0e16dc0257edeae798934336a3a1008984e01a3a06f3326e32b`	viewer · TDB · JSON
ReTa-18Guo.tdb	C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018). doi:10.1016/j.calphad.2018.01.005	`e8c69b79df481f522f63fff5850afc27189b245ba162d1782bf1ac4d2f7e456a`	viewer · TDB · JSON
ReTa-99Cui.tdb	Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999). doi:10.1016/S0925-8388(98)01005-6	`34a1ef9fd4224280c58a79a2829e8298c779c70cca06f872238efcb2c54bb1e0`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
ReTa-00Liu-LB.tdb	3037.12	HCP_A3 (x(Ta) 0.03934) + LIQUID (x(Ta) 0.18572) + CHI_A12 (x(Ta) 0.20324)
ReTa-00Liu-LB.tdb	2988.83	CHI_A12 (x(Ta) 0.37263) + SIGMA_OLD (x(Ta) 0.43575) + LIQUID (x(Ta) 0.45348)
ReTa-00Liu-LB.tdb	2944.27	SIGMA_OLD (x(Ta) 0.45526) + LIQUID (x(Ta) 0.51651) + BCC_A2 (x(Ta) 0.55449)
ReTa-00Liu-LB.tdb	2755.7	CHI_A12 (x(Ta) 0.38322) + SIGMA_D8B (x(Ta) 0.44133) + SIGMA_OLD (x(Ta) 0.44811)
ReTa-00Liu-LB.tdb	2745.26	SIGMA_D8B (x(Ta) 0.44259) + SIGMA_OLD (x(Ta) 0.4495) + BCC_A2 (x(Ta) 0.53415)
ReTa-00Liu-LB.tdb	2730.25	CHI_A12 (x(Ta) 0.38406) + SIGMA_D8B (x(Ta) 0.44236) + BCC_A2 (x(Ta) 0.5331)
ReTa-18Guo.tdb	3032.48	HCP_A3 (x(Ta) 0.04109) + LIQUID (x(Ta) 0.15227) + CHI_A12 (x(Ta) 0.20028)
ReTa-18Guo.tdb	2962.3	CHI_A12 (x(Ta) 0.36769) + SIGMA_D8B (x(Ta) 0.43062) + LIQUID (x(Ta) 0.46931)
ReTa-18Guo.tdb	2931.66	SIGMA_D8B (x(Ta) 0.46934) + LIQUID (x(Ta) 0.51574) + BCC_A2 (x(Ta) 0.5518)
ReTa-18Guo.tdb	2735.12	CHI_A12 (x(Ta) 0.37932) + SIGMA_D8B (x(Ta) 0.4526) + BCC_A2 (x(Ta) 0.53328)
ReTa-99Cui.tdb	3041.94	HCP_A3 (x(Ta) 0.02107) + LIQUID (x(Ta) 0.16354) + CHI_A12 (x(Ta) 0.20635)
ReTa-99Cui.tdb	2969.8	CHI_A12 (x(Ta) 0.34079) + RE3TA2_D8B (x(Ta) 0.4) + LIQUID (x(Ta) 0.42259)
ReTa-99Cui.tdb	2928.21	RE3TA2_D8B (x(Ta) 0.4) + LIQUID (x(Ta) 0.48428) + BCC_A2 (x(Ta) 0.54638)
ReTa-99Cui.tdb	2928.21	RE3TA2_D8B (x(Ta) 0.4) + LIQUID (x(Ta) 0.48443) + BCC_A2 (x(Ta) 0.54655)
ReTa-99Cui.tdb	2735.32	CHI_A12 (x(Ta) 0.36804) + RE3TA2_D8B (x(Ta) 0.4) + BCC_A2 (x(Ta) 0.53444)
ReTa-99Cui.tdb	2735.32	CHI_A12 (x(Ta) 0.36804) + RE3TA2_D8B (x(Ta) 0.4) + BCC_A2 (x(Ta) 0.53444)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull ReTa-00Liu-LB · CALPHAD hull ReTa-99Cui

Invariant reactions (literature)

Invariant reactions reported in the literature for the Re–Ta system (18)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
3103	eutectic: Liq->(Re)+χ	(Re): Ta 0.052; χ: Ta 0.195	experimental	[1] Cui 1999 cites Tylkina 1960	Table 2, p. 4, row 2 report
3040	eutectic: Liq->(Re)+χ	L: Ta 0.164; (Re): Ta 0.021; χ: Ta 0.206	model	[1] Cui 1999	Table 2, p. 4, row 3 report
3033	eutectic: Liq->(Re)+χ	L: Ta 0.164; (Re): Ta 0.052; χ: Ta 0.205	experimental	[1] Cui 1999 cites Brophy 1960	Table 2, p. 4, row 1 report
3033	liq = hcp + χ	liq: Ta 0.187; hcp: Ta 0.0393; χ: Ta 0.203	unspecified	[2] Liu 2000	Table 8, p. 6, row 2 report
3018	peritectic: Liq+χ->σ	χ: Ta 0.376; σ: Ta 0.41	experimental	[1] Cui 1999 cites Brophy 1960	Table 2, p. 4, row 6 report
2977	liq + χ = σ	liq: Ta 0.457; χ: Ta 0.373; σ: Ta 0.436	unspecified	[2] Liu 2000	Table 8, p. 6, row 3 report
2968	eutectic: Liq->σ+(Ta)	L: Ta 0.497; σ: Ta 0.417; (Ta): Ta 0.546	experimental	[1] Cui 1999 cites Brophy 1960	Table 2, p. 4, row 9 report
2966	liq + χ = σ	liq: Ta 0.465; χ: Ta 0.375; σ: Ta 0.433	unspecified	[2] Liu 2000	Table 8, p. 6, row 6 report
2958	peritectic: Liq+χ->σ	L: Ta 0.428; χ: Ta 0.342; σ: Ta 0.4	model	[1] Cui 1999	Table 2, p. 4, row 8 report
2953	peritectic: Liq+χ->σ	χ: Ta 0.36; σ: Ta 0.47	experimental	[1] Cui 1999 cites Tylkina 1960	Table 2, p. 4, row 7 report
2933	liq = σ + bcc	liq: Ta 0.517; σ: Ta 0.454; bcc: Ta 0.553	unspecified	[2] Liu 2000	Table 8, p. 6, row 4 report
2929	liq = σ + bcc	liq: Ta 0.51; σ: Ta 0.445; bcc: Ta 0.546	unspecified	[2] Liu 2000	Table 8, p. 6, row 7 report
2920	eutectic: Liq->σ+(Ta)	L: Ta 0.485; σ: Ta 0.4; (Ta): Ta 0.547	model	[1] Cui 1999	Table 2, p. 4, row 11 report
2737	eutectoid: σ->(Ta)+χ	σ: Ta 0.4; (Ta): Ta 0.525; χ: Ta 0.398	experimental	[1] Cui 1999 cites Brophy 1960	Table 2, p. 4, row 12 report
2735	eutectoid: σ->(Ta)+χ	σ: Ta 0.4; (Ta): Ta 0.536; χ: Ta 0.367	model	[1] Cui 1999	Table 2, p. 4, row 13 report
2735	σ = χ + bcc	σ: Ta 0.449; χ: Ta 0.384; bcc: Ta 0.533	unspecified	[2] Liu 2000	Table 8, p. 6, row 5 report
2730	σ = χ + bcc	σ: Ta 0.442; χ: Ta 0.384; bcc: Ta 0.533	unspecified	[2] Liu 2000	Table 8, p. 6, row 8 report
2673	eutectic: Liq->σ+(Ta)	σ: Ta 0.48; (Ta): Ta 0.58	experimental	[1] Cui 1999 cites Tylkina 1960	Table 2, p. 4, row 10 report

Other properties

Phase transition (3)

Phase transition, Re–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	3066 K	3066	liq = χ liq: Ta 0.31; χ: Ta 0.31	unspecified	[2] Liu 2000	Table 8, p. 6, row 1 report
Phase transition	3068 K	3068	congruent melting: Liq->χ L: Ta 0.215; χ: Ta 0.215	experimental	[1] Cui 1999 cites Brophy 1960	Table 2, p. 4, row 4 report
Phase transition	3070 K	3070	congruent melting: Liq->χ L: Ta 0.239; χ: Ta 0.239	model	[1] Cui 1999	Table 2, p. 4, row 5 report

Phase equilibrium (12)

Phase equilibrium, Re–Ta system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition		bcc + σ bcc: Re 0.45, Ta 0.55	experimental	[2] Liu 2000 cites Tregubov 1973	Table 2, p. 2, row 13 report
Phase composition		χ + σ or bcc χ: Re 0.63, Ta 0.37	experimental	[2] Liu 2000 cites Tregubov 1973	Table 2, p. 2, row 12 report
Phase composition	1473	bcc + σ bcc: Re 0.54, Ta 0.46	experimental	[2] Liu 2000 cites Greenfield 1956	Table 2, p. 2, row 4 report
Phase composition	1473	σ σ: Re 0.608, Ta 0.392	experimental	[2] Liu 2000 cites Greenfield 1956	Table 2, p. 2, row 3 report
Phase composition	1473	χ + hcp + x + s + bcc χ: Re 0.75, Ta 0.25; x: Re 0.608, Ta 0.392; s: Re 0.608, Ta 0.392; bcc: Re 0.54, Ta 0.46	experimental	[2] Liu 2000 cites Greenfield 1956	Table 2, p. 2, row 1 report
Phase composition	1473	χ + σ or bcc χ: Re 0.608, Ta 0.392	experimental	[2] Liu 2000 cites Greenfield 1956	Table 2, p. 2, row 2 report
Phase composition	1773	hcp + χ + x + bcc hcp: Re 0.96, Ta 0.04; x: Re 0.63, Ta 0.37; bcc: Re 0.45, Ta 0.55	experimental	[2] Liu 2000 cites Tregubov 1973	Table 2, p. 2, row 10 report
Phase composition	2773	bcc + σ bcc: Re 0.45, Ta 0.55	experimental	[2] Liu 2000 cites Tregubov 1967	Table 2, p. 2, row 9 report
Phase composition	2773	hcp + χ + x + s + bcc hcp: Re 0.97, Ta 0.03; x: Re 0.63, Ta 0.37; s: Re 0.56, Ta 0.44; bcc: Re 0.45, Ta 0.55	experimental	[2] Liu 2000 cites Tregubov 1967	Table 2, p. 2, row 5 report
Phase composition	2773	σ σ: Re 0.56, Ta 0.44	experimental	[2] Liu 2000 cites Tregubov 1967	Table 2, p. 2, row 8 report
Phase composition	2773	χ + hcp χ: Re 0.87, Ta 0.13	experimental	[2] Liu 2000 cites Tregubov 1967	Table 2, p. 2, row 6 report
Phase composition	2773	χ + σ or bcc χ: Re 0.63, Ta 0.37	experimental	[2] Liu 2000 cites Tregubov 1967	Table 2, p. 2, row 7 report

Formation (5)

Formation, Re–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Gibbs energy of formation	-33 kJ/mol-atom	298.15	TaRe1.5 (σ or χ) alloy: Ta 0.4	experimental	[2] Liu 2000 cites Brewer 1973 doi	Table 4, p. 3, row 1 report
Gibbs energy of formation	-12 kJ/mol-atom	298.15	TaRe1.5 (σ or χ) alloy: Ta 0.4	experimental	[2] Liu 2000 cites Brewer 1973 doi	Table 4, p. 3, row 1 report
Gibbs energy of formation	-14 kJ/mol-atom	298.15	TaRe1.85 (χ) alloy: Ta 0.350877	experimental	[2] Liu 2000 cites Brewer 1973 doi	Table 4, p. 3, row 1 report
Gibbs energy of formation	-29 kJ/mol-atom	298.15	TaRe1.85 (χ) alloy: Ta 0.350877	experimental	[2] Liu 2000 cites Brewer 1973 doi	Table 4, p. 3, row 1 report
Gibbs energy of formation	-18.7 kJ/mol-atom ± 1.2	298.15	TaRe3.6 (χ) alloy: Ta 0.217391	experimental	[2] Liu 2000 cites Brewer 1973 doi	Table 4, p. 3, row 1 report

Sources

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

Yuwen Cui, Zhanpeng Jin, Assessment of the Re–Ta binary system, Journal of Alloys and Compounds 285, 150-155 (1999). doi:10.1016/s0925-8388(98)01005-6
Zi-Kui Liu, Y.Austin Chang, Evaluation of the thermodynamic properties of the Re–Ta and Re–W systems, Journal of Alloys and Compounds 299, 153-162 (2000). doi:10.1016/s0925-8388(99)00597-6

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}
}