# Nb–Ta system

> Nb–Ta system: 0 accepted literature values (none) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/NB-TA.html · Markdown: https://data.orchid-project.org/systems/NB-TA.md

0 accepted literature values from 0 paper(s); 3 calculated phase diagram(s).

Data: [interactive phase diagram](https://orchid-project.org/phase-diagrams/#NB-TA/NbTa-02Har.json) · [phases (5)](https://data.orchid-project.org/phases/pages/NB-TA.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/NB-TA.html) · [Markdown](https://data.orchid-project.org/systems/NB-TA.md)

## 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.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| NbTa-02Har.tdb | K.C. Hari Kumar, T. Van Rompaey, P. Wollants, Z. Metallkd., 93, 1146-53(2002). [doi:10.1515/ijmr-2002-0196](https://doi.org/10.1515/ijmr-2002-0196) | `ca67283e79b7fafa2f980a4602061411d5041b1355bc9780a514a1126b0037af` | [viewer](https://orchid-project.org/phase-diagrams/#NB-TA/NbTa-02Har.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbTa-02Har.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbTa-02Har.json) |
| NbTa-04Xio-LB.tdb | W. Xiong, Y. Du, Y. Li, B.Y. Huang, H.H. Xu, H.L. Chen, Z. Pan, Calphad, 28, 133-40(2004). [doi:10.1016/j.calphad.2004.07.002](https://doi.org/10.1016/j.calphad.2004.07.002) | `849d2204e0561aeb922620fb56c4b115ee1f55aee00d5109044daccfdd02ba07` | [viewer](https://orchid-project.org/phase-diagrams/#NB-TA/NbTa-04Xio-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbTa-04Xio-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbTa-04Xio-LB.json) |
| NbTa-22Zha.tdb | E. Zhang, Y. Tang, M. Wen, A. Obaied, I. Roslyakova, L. Zhang, Int. J. Refract. Met. Hard Mater., 103, 105780(2022). [doi:10.1016/j.ijrmhm.2022.105780](https://doi.org/10.1016/j.ijrmhm.2022.105780) | `5229418c54024a1df42b435c2fd4e266235884eab3fc870d3858ac9f3cffbcfd` | [viewer](https://orchid-project.org/phase-diagrams/#NB-TA/NbTa-22Zha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbTa-22Zha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbTa-22Zha.json) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/NB/NB-TA.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/NB/NB-TA.json) · [CALPHAD hull NbTa-02Har](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-TA--NbTa-02Har.json) · [CALPHAD hull NbTa-04Xio-LB](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-TA--NbTa-04Xio-LB.json)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).