# Si–Ta–V system

> Si–Ta–V system: 36 accepted literature values (crystal structure 34, formation 2) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

36 accepted literature values from 1 paper(s) (experimental 33, model 2, unspecified 1); 0 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/SI-TA-V.json) · [CSV](https://data.orchid-project.org/systems/SI-TA-V.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SI-TA-V) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SI-TA-V.html) · [Markdown](https://data.orchid-project.org/systems/SI-TA-V.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 33 |
| model | 2 |
| unspecified | 1 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| formation | 2 |
| crystal structure | 34 |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Si–Ta–V system (2)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Si3Si |  | 52 kJ/mol-atom | 0 | model |  |  | [1] Broz 2013; _cites Zhang 2008_ [doi](https://doi.org/10.1016/j.calphad.2007.12.005) | Table 2, p. 6, row 18; `ORC-LQZIMUBLTQ.d8b8fe` |  |
| Si3Si |  | 56.7 kJ/mol-atom | 0 | unspecified |  |  | [1] Broz 2013 | Table 2, p. 6, row 17; `ORC-SX4MX3XAG7.fd3a1a` |  |

## Other properties

### Crystal structure (34)

Table: Crystal structure, Si–Ta–V system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 5.4306 Å | 298.15 | (Si); _alloy: Ta 0, V 0_ | model | [1] Broz 2013; _cites Smith 1983_ [doi](https://doi.org/10.1007/bf02868668) | Table 1, p. 3, row 5; `ORC-7R5VUFFXXW` |  |
| Lattice a | 0.61623 not_printed ± 8.000e-5 | 298.15 | (Ta1−xVx)2Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 12; `ORC-UYGTFGIJ3Q.1bb4b7` |  |
| Lattice a | 0.61454 not_printed ± 7.000e-5 | 298.15 | (Ta1−xVx)2Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 11; `ORC-YUCE63NX33.b19abf` |  |
| Lattice a | 1.00903 not_printed ± 9.000e-5 | 298.15 | (Ta1−xVx)3Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 8; `ORC-GGGAL44F7G.88ab48` |  |
| Lattice a | 0.6443 not_printed ± 7.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 15; `ORC-7PY3HHUDBG.e18a28` |  |
| Lattice a | 0.94674 not_printed ± 7.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 22; `ORC-T6WM7HA6SR.42c862` |  |
| Lattice a | 0.65154 not_printed ± 5.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 16; `ORC-ZVD7YDLWKA.c862ce` |  |
| Lattice a | 4.763 Å | 298.15 | (TaxV1−x)3Si | experimental | [1] Broz 2013; _cites Alekseyevskiy 1977_ | Table 1, p. 3, row 41; `ORC-3K6MKZIGWJ` |  |
| Lattice a | 0.4755 not_printed ± 4.000e-4 | 298.15 | (TaxV1−x)3Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 40; `ORC-R5TZ5DT3SS` |  |
| Lattice a | 0.7625 not_printed ± 5.000e-4 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Steinmetz 1977_ [doi](https://doi.org/10.1016/0022-5088%2877%2990006-6) | Table 1, p. 3, row 46; `ORC-2MWSPHFCD6.fd72fc` |  |
| Lattice a | 0.7643 not_printed ± 7.000e-4 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 47; `ORC-FIMCEAJCHH.d7f02b` |  |
| Lattice a | 0.7258 not_printed ± 6.000e-4 | 298.15 | τ1-(TaxV1−x)5Si3 | experimental | [1] Broz 2013; _cites Mittal 1978_ [doi](https://doi.org/10.1016/0022-5088%2878%2990091-7) | Table 1, p. 3, row 23; `ORC-GWTBGG37U4.d696c8` |  |
| Lattice a | 5.05 Å | 298.15 | τ2-Ta(TaVSi)2; _alloy: Si 0.285714, Ta 0.428571, V 0.285714_ | experimental | [1] Broz 2013; _cites Mittal 1978_ [doi](https://doi.org/10.1016/0022-5088%2878%2990091-7) | Table 1, p. 3, row 28; `ORC-GJEEPWPUFV.89d5fa` |  |
| Lattice a | 3.315 Å (range 3.305 to 3.325) | 300 | (Ta1−xVx) | experimental | [1] Broz 2013; _cites Rudy 1969_ | Table 1, p. 3, row 49; `ORC-YTQ6H7OHMU` |  |
| Lattice a | 4.67 Å (range 4.574 to 4.766) | 300 | (Ta1−xVx)Si2 | experimental | [1] Broz 2013; _cites Nowotny 1957_ [doi](https://doi.org/10.1007/bf00901624) | Table 1, p. 3, row 52; `ORC-QVO4FVML2O.3790f7` |  |
| Lattice a | 3.0266 Å (range 3.0232 to 3.03) | 300 | (V1−xSix) | experimental | [1] Broz 2013; _cites Bruning 1967_ | Table 1, p. 3, row 50; `ORC-FPOE3TIC7D` |  |
| Lattice a | 7.2945 Å (range 7.1976 to 7.3914) | 300 | τ1-(TaxV1−x)5Si3; _alloy: Ta 0.2, V 0.2_ | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 51; `ORC-VUEX5TYIZZ.8335a9` |  |
| Lattice a | 5 Å ± 0.03 | 300 | τ2-Ta(TaVSi)2; _alloy: Si 0.285714, Ta 0.428571, V 0.285714_ | experimental | [1] Broz 2013; _cites Ganglberger 1965_ [doi](https://doi.org/10.1007/bf00902104) | Table 1, p. 3, row 27; `ORC-PQUHS3KDS4.73ef87` |  |
| Lattice a | 0.7151 not_printed ± 1.000e-5 | 1773.15 | τ3-Ta(TaxV1−x−ySiy)2 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 31; `ORC-MVZKZIXZYT` |  |
| Lattice b | 1.609 not_printed ± 0.001 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Steinmetz 1977_ [doi](https://doi.org/10.1016/0022-5088%2877%2990006-6) | Table 1, p. 3, row 46; `ORC-2MWSPHFCD6.4d30a9` |  |
| Lattice b | 1.6078 not_printed ± 5.000e-4 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 47; `ORC-FIMCEAJCHH.cc284f` |  |
| Lattice c | 0.50574 not_printed ± 7.000e-5 | 298.15 | (Ta1−xVx)2Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 12; `ORC-UYGTFGIJ3Q.e88ac9` |  |
| Lattice c | 0.50431 not_printed ± 7.000e-5 | 298.15 | (Ta1−xVx)2Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 11; `ORC-YUCE63NX33.92910b` |  |
| Lattice c | 0.51276 not_printed ± 9.000e-5 | 298.15 | (Ta1−xVx)3Si | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 8; `ORC-GGGAL44F7G.dadd2f` |  |
| Lattice c | 1.19154 not_printed ± 9.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 15; `ORC-7PY3HHUDBG.411786` |  |
| Lattice c | 0.47752 not_printed ± 6.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 22; `ORC-T6WM7HA6SR.0a7b0a` |  |
| Lattice c | 1.18753 not_printed ± 9.000e-5 | 298.15 | (Ta1−xVx)5Si3 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 16; `ORC-ZVD7YDLWKA.1b3ffc` |  |
| Lattice c | 0.4936 not_printed ± 3.000e-4 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Steinmetz 1977_ [doi](https://doi.org/10.1016/0022-5088%2877%2990006-6) | Table 1, p. 3, row 46; `ORC-2MWSPHFCD6.606736` |  |
| Lattice c | 0.4939 not_printed ± 5.000e-4 | 298.15 | (TaxV1−x)6Si5 | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 47; `ORC-FIMCEAJCHH.9b594b` |  |
| Lattice c | 0.4926 not_printed ± 3.000e-4 | 298.15 | τ1-(TaxV1−x)5Si3 | experimental | [1] Broz 2013; _cites Mittal 1978_ [doi](https://doi.org/10.1016/0022-5088%2878%2990091-7) | Table 1, p. 3, row 23; `ORC-GWTBGG37U4.b86c3a` |  |
| Lattice c | 8.23 Å | 298.15 | τ2-Ta(TaVSi)2; _alloy: Si 0.285714, Ta 0.428571, V 0.285714_ | experimental | [1] Broz 2013; _cites Mittal 1978_ [doi](https://doi.org/10.1016/0022-5088%2878%2990091-7) | Table 1, p. 3, row 28; `ORC-GJEEPWPUFV.4625b7` |  |
| Lattice c | 6.453 Å (range 6.357 to 6.549) | 300 | (Ta1−xVx)Si2 | experimental | [1] Broz 2013; _cites Nowotny 1957_ [doi](https://doi.org/10.1007/bf00901624) | Table 1, p. 3, row 52; `ORC-QVO4FVML2O.f64184` |  |
| Lattice c | 4.95205 Å (range 4.8906 to 5.0135) | 300 | τ1-(TaxV1−x)5Si3; _alloy: Ta 0.2, V 0.2_ | experimental | [1] Broz 2013; _cites Khan 2012_ [doi](https://doi.org/10.1016/j.jssc.2011.12.024) | Table 1, p. 3, row 51; `ORC-VUEX5TYIZZ.d41190` |  |
| Lattice c | 8.26 Å | 300 | τ2-Ta(TaVSi)2; _alloy: Si 0.285714, Ta 0.428571, V 0.285714_ | experimental | [1] Broz 2013; _cites Ganglberger 1965_ [doi](https://doi.org/10.1007/bf00902104) | Table 1, p. 3, row 27; `ORC-PQUHS3KDS4.1914a6` |  |

## Sources

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

1. P. Broz, A.U. Khan, H. Niu, X.-Q. Chen, D. Li, J. Vrestal et al., The system Ta–V–Si: Thermodynamic modeling, Journal of Solid State Chemistry 199, 171-180 (2013). [doi:10.1016/j.jssc.2012.12.003](https://doi.org/10.1016/j.jssc.2012.12.003)

## 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). https://doi.org/10.5281/zenodo.23735569
- 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 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.

```bibtex
@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_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/).