# Cr–P system

> Cr–P system: 2 accepted literature values (activity / EMF / Gibbs energy 2) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

2 accepted literature values from 1 paper(s) (model 2); 2 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/CR-P.json) · [CSV](https://data.orchid-project.org/systems/CR-P.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CR-P) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CR-P/CrP-14Mie.json) · [phases (8)](https://data.orchid-project.org/phases/pages/CR-P.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CR-P.html) · [Markdown](https://data.orchid-project.org/systems/CR-P.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| model | 2 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| activity / EMF / Gibbs energy | 2 |

## 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 |
|---|---|---|---|
| CrP-14Mie.tdb | J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014). [doi:10.1007/s11669-014-0314-x](https://doi.org/10.1007/s11669-014-0314-x) | `13fd479377120522b9809dc36c02c00447b146c0c4c2f9c4fe1d8dc02472b5b3` | [viewer](https://orchid-project.org/phase-diagrams/#CR-P/CrP-14Mie.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrP-14Mie.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrP-14Mie.json) |
| CrP-99Mie-LB.tdb | J. Miettinen, Calphad, 23, 191-99(1999). [doi:10.1016/S0364-5916(99)00019-X](https://doi.org/10.1016/S0364-5916%2899%2900019-X) | `372cae8e610e58d479c7da367b4c0325402057b10dc71e3f2c77a369d4305f59` | [viewer](https://orchid-project.org/phase-diagrams/#CR-P/CrP-99Mie-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrP-99Mie-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrP-99Mie-LB.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CrP-14Mie.tdb | 1784.51 | LIQUID (x(P) 0.21997) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-14Mie.tdb | 1784.5 | LIQUID (x(P) 0.21958) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-14Mie.tdb | 1784.5 | LIQUID (x(P) 0.21964) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-14Mie.tdb | 1644.33 | BCC_A2 (x(P) 1.000e-4) + LIQUID (x(P) 0.13387) + M3P_D0E (x(P) 0.25) |
| CrP-99Mie-LB.tdb | 1783.12 | LIQUID (x(P) 0.21756) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-99Mie-LB.tdb | 1783.11 | LIQUID (x(P) 0.21703) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-99Mie-LB.tdb | 1783.11 | LIQUID (x(P) 0.21711) + M3P_D0E (x(P) 0.25) + M2P_C22 (x(P) 0.33333) |
| CrP-99Mie-LB.tdb | 1644.99 | BCC_A2 (x(P) 1.000e-4) + LIQUID (x(P) 0.13374) + M3P_D0E (x(P) 0.25) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CR/CR-P.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CR/CR-P.json) · [CALPHAD hull CrP-99Mie-LB](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-P--CrP-99Mie-LB.json)

## Other properties

### Activity / EMF / Gibbs energy (2)

Table: Activity / EMF / Gibbs energy, Cr–P system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy | -150 kJ/mol | 1920.15 | Cr2P | model | [1] Miettinen 1999 | p. 4; `ORC-CF25SFD6FI.90c67e` | “After making the necessary change of reference state of pure phosphorus from gaseous phase (5) to white-P (21), a certain Gibbs energy function was obtained for Crr.ss5Pi.ro5yielding a value of about -159 kJ/mol at 1647'C (calculated melting point of Cr2P) whereas Eq.(9) yields a value of about -150 kJ/mol for Cr2P at the same temperature.” |
| Gibbs energy | -159 kJ/mol | 1920.15 | Crr.ss5Pi.ro5 | model | [1] Miettinen 1999; _cites AI 1998_ | p. 4; `ORC-CF25SFD6FI.5afe24` | “After making the necessary change of reference state of pure phosphorus from gaseous phase (5) to white-P (21), a certain Gibbs energy function was obtained for Crr.ss5Pi.ro5yielding a value of about -159 kJ/mol at 1647'C (calculated melting point of Cr2P) whereas Eq.(9) yields a value of about -150 kJ/mol for Cr2P at the same temperature.” |

## Sources

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

1. Jyrki Miettinen, Thermodynamic description of Cr-P AND Fe-Cr-P systems at low phosphorus contents, Calphad 23, 141-154 (1999). [doi:10.1016/s0364-5916(99)00019-x](https://doi.org/10.1016/s0364-5916%2899%2900019-x)

## 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-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 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_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/).