Pt–Ta system

0 accepted literature values from 0 paper(s); 1 calculated phase diagram(s).

Data: interactive phase diagram · phases (9) · papers (bibliography) · Markdown

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
PtTa-98Spe.tdb	P.J. Spencer, unpublished work, 1998.	`fd7011b9e894274ef358411f35bd2d1c88941d3560e663bbc82eb424f80db44b`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
PtTa-98Spe.tdb	2632.67	LIQUID (x(Ta) 0.734) + PTTA3_D8B (x(Ta) 0.76513) + BCC_A2 (x(Ta) 0.9425)
PtTa-98Spe.tdb	2496.33	PT3TA (x(Ta) 0.25) + LIQUID (x(Ta) 0.3053) + PT2TA (x(Ta) 0.33333)
PtTa-98Spe.tdb	2496.33	PT3TA (x(Ta) 0.25) + LIQUID (x(Ta) 0.30548) + PT2TA (x(Ta) 0.33333)
PtTa-98Spe.tdb	2496.33	PT3TA (x(Ta) 0.25) + LIQUID (x(Ta) 0.30501) + PT2TA (x(Ta) 0.33333)
PtTa-98Spe.tdb	2117.81	PT2TA (x(Ta) 0.33333) + PTTA (x(Ta) 0.5) + LIQUID (x(Ta) 0.50909)
PtTa-98Spe.tdb	2117.81	PT2TA (x(Ta) 0.33333) + PTTA (x(Ta) 0.5) + LIQUID (x(Ta) 0.50912)
PtTa-98Spe.tdb	2068.44	PTTA (x(Ta) 0.5) + LIQUID (x(Ta) 0.53613) + PTTA3_D8B (x(Ta) 0.64929)
PtTa-98Spe.tdb	1999.74	PTTA3_D8B (x(Ta) 0.77362) + PTTA6 (x(Ta) 0.85714) + BCC_A2 (x(Ta) 0.92705)
PtTa-98Spe.tdb	1999.74	PTTA3_D8B (x(Ta) 0.77362) + PTTA6 (x(Ta) 0.85714) + BCC_A2 (x(Ta) 0.92704)
PtTa-98Spe.tdb	1944.7	FCC_A1 (x(Ta) 1.300e-4) + LIQUID (x(Ta) 0.04921) + PT3TA (x(Ta) 0.25)
PtTa-98Spe.tdb	1944.7	FCC_A1 (x(Ta) 1.300e-4) + LIQUID (x(Ta) 0.04911) + PT3TA (x(Ta) 0.25)
PtTa-98Spe.tdb	1909.6	PT2TA (x(Ta) 0.33333) + PTTA (x(Ta) 0.5) + PTTA3_D8B (x(Ta) 0.64392)
PtTa-98Spe.tdb	1909.6	PT2TA (x(Ta) 0.33333) + PTTA (x(Ta) 0.5) + PTTA3_D8B (x(Ta) 0.64392)
PtTa-98Spe.tdb	461.76	PT2TA (x(Ta) 0.33333) + PTTA3_D8B (x(Ta) 0.65928) + PTTA6 (x(Ta) 0.85714)
PtTa-98Spe.tdb	461.76	PT2TA (x(Ta) 0.33333) + PTTA3_D8B (x(Ta) 0.65927) + PTTA6 (x(Ta) 0.85714)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Please cite

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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_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}
}