# P system

> P system: 19 accepted literature values (crystal structure 19) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

19 accepted literature values from 3 paper(s) (experimental 13, unspecified 6); 0 calculated phase diagram(s).

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

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 13 |
| unspecified | 6 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| crystal structure | 19 |

## Other properties

### Crystal structure (19)

Table: Crystal structure, P system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 9.17 Å | 123.15 | γ-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Okudera 2005_ [doi](https://doi.org/10.1524/zkri.220.2.259.59137) | Table 1, p. 2, row 4; `ORC-ULY4QGAWJY.665758` |  |
| Lattice a | 11.45 Å | 158.15 | β-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Simon 1987_ [doi](https://doi.org/10.1080/03086648708080631) | Table 1, p. 2, row 3; `ORC-6AAXVR4QYL.bf0e0f` |  |
| Lattice a | 1851 not_printed ± 3 | 243.15 | α-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Corbridge 1952_ | Table 1, p. 2, row 2; `ORC-PIDWSQK37K` |  |
| Lattice a | 9.21 Å | 298.15 | (P); _alloy: P 1_ | experimental | [2] Chen 2022; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table I, p. 2, row 12; `ORC-I4PPN5HFBH.a75a2f` |  |
| Lattice a | 3.3136 Å | 298.15 | P(black); _P(black): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 4; `ORC-A6OPTW3NHL.eccfe2` |  |
| Lattice a | 11.31 Å | 298.15 | P(red); _P(red): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 6; `ORC-DN33WENJMQ` |  |
| Lattice a | 7.18 Å | 298.15 | P(white); _P(white): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 5; `ORC-BG3WPESFM7.1b626f` |  |
| Lattice a | 9.21 Å | 298.15 | red-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table 1, p. 2, row 5; `ORC-JGD75DVYZS.28ee59` |  |
| Lattice b | 8.33 Å | 123.15 | γ-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Okudera 2005_ [doi](https://doi.org/10.1524/zkri.220.2.259.59137) | Table 1, p. 2, row 4; `ORC-ULY4QGAWJY.f13e2d` |  |
| Lattice b | 5.5 Å | 158.15 | β-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Simon 1987_ [doi](https://doi.org/10.1080/03086648708080631) | Table 1, p. 2, row 3; `ORC-6AAXVR4QYL.504c20` |  |
| Lattice b | 9.15 Å | 298.15 | (P); _alloy: P 1_ | experimental | [2] Chen 2022; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table I, p. 2, row 12; `ORC-I4PPN5HFBH.65f863` |  |
| Lattice b | 10.478 Å | 298.15 | P(black); _P(black): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 4; `ORC-A6OPTW3NHL.2bf0f0` |  |
| Lattice b | 9.15 Å | 298.15 | red-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table 1, p. 2, row 5; `ORC-JGD75DVYZS.1f6f6d` |  |
| Lattice c | 5.43 Å | 123.15 | γ-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Okudera 2005_ [doi](https://doi.org/10.1524/zkri.220.2.259.59137) | Table 1, p. 2, row 4; `ORC-ULY4QGAWJY.ef22ad` |  |
| Lattice c | 11.26 Å | 158.15 | β-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Simon 1987_ [doi](https://doi.org/10.1080/03086648708080631) | Table 1, p. 2, row 3; `ORC-6AAXVR4QYL.24d177` |  |
| Lattice c | 22.6 Å | 298.15 | (P); _alloy: P 1_ | experimental | [2] Chen 2022; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table I, p. 2, row 12; `ORC-I4PPN5HFBH.333c27` |  |
| Lattice c | 4.3763 Å | 298.15 | P(black); _P(black): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 4; `ORC-A6OPTW3NHL.88a0d0` |  |
| Lattice c | 4.3763 Å | 298.15 | P(white); _P(white): P 1_ | unspecified | [3] Karakaya 1988; _cites ref. 2_ | Table 3, p. 3, row 5; `ORC-BG3WPESFM7.f62cd9` |  |
| Lattice c | 22.6 Å | 298.15 | red-P; _alloy: P 1_ | experimental | [1] Liang 2013; _cites Thurn 1969_ [doi](https://doi.org/10.1107/s0567740869001853) | Table 1, p. 2, row 5; `ORC-JGD75DVYZS.437139` |  |

## Sources

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

1. Song-Mao Liang, Rainer Schmid-Fetzer, Thermodynamic assessment of the Al–P system based on original experimental data, Calphad 42, 76-85 (2013). [doi:10.1016/j.calphad.2013.07.001](https://doi.org/10.1016/j.calphad.2013.07.001)
2. Shanxiong Chen, Jiong Wang, Shangzhao Yu, Biao Hu, Qing Wu, Yong Du, Thermodynamic Modeling of the Ge-X (X = As, Se, S, P) Systems, J. Electron. Mater. 51, 2114-2130 (2022). [doi:10.1007/s11664-022-09474-1](https://doi.org/10.1007/s11664-022-09474-1)
3. I. Karakaya, W. T. Thompson, The Ag−P (Silver-Phosphorus) system, Bulletin of Alloy Phase Diagrams 9, 232-236 (1988). [doi:10.1007/bf02881270](https://doi.org/10.1007/bf02881270)

## 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/).