# Ni–P system

> Ni–P system: 16 accepted literature values (invariant reaction 8, phase transition 8) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

16 accepted literature values from 1 paper(s) (experimental 8, unspecified 8); 3 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/NI-P.json) · [CSV](https://data.orchid-project.org/systems/NI-P.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#NI-P) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#NI-P/NiP-15Mie.json) · [phases (14)](https://data.orchid-project.org/phases/pages/NI-P.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/NI-P.html) · [Markdown](https://data.orchid-project.org/systems/NI-P.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 8 |
| unspecified | 8 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 8 |
| phase transition | 8 |

## 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 |
|---|---|---|---|
| NiP-15Mie.tdb | J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus, 36, 78-87(2015). [doi:10.1007/s11669-014-0358-y](https://doi.org/10.1007/s11669-014-0358-y) | `a366279c70ac4520bba4a362c4c3d9245a91a7905449acf2455094ccdd3f475b` | [viewer](https://orchid-project.org/phase-diagrams/#NI-P/NiP-15Mie.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NiP-15Mie.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NiP-15Mie.json) |
| NiP-89NPL.tdb | NPL, unpublished, 1989. | `4b112c50bbb75441124d6d00b1f520139050007582bb2ae91c5801492f156c4a` | [viewer](https://orchid-project.org/phase-diagrams/#NI-P/NiP-89NPL.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NiP-89NPL.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NiP-89NPL.json) |
| NiP-99Shi.tdb | J.-H. Shim, H.-J. Chung, D.N. Lee, J. Alloys Compd., 282, 175-81(1999). [doi:10.1016/S0925-8388(98)00826-3](https://doi.org/10.1016/S0925-8388%2898%2900826-3) | `1e721e0ac49254b22b5bcd7b32e583deed4f0848b8df4878841660f5ae2bbe33` | [viewer](https://orchid-project.org/phase-diagrams/#NI-P/NiP-99Shi.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NiP-99Shi.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NiP-99Shi.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| NiP-15Mie.tdb | 1395.6 | NI5P2_H (x(P) 0.28571) + NI12P5_H (x(P) 0.29412) + LIQUID (x(P) 0.31134) |
| NiP-15Mie.tdb | 1370.2 | NI12P5_H (x(P) 0.29412) + LIQUID (x(P) 0.32056) + M2P_C22 (x(P) 0.33333) |
| NiP-15Mie.tdb | 1301.28 | LIQUID (x(P) 0.24235) + NI5P2_L (x(P) 0.28571) + NI5P2_H (x(P) 0.28571) |
| NiP-15Mie.tdb | 1301.28 | NI5P2_H (x(P) 0.28571) + NI5P2_L (x(P) 0.28571) + NI12P5_H (x(P) 0.29412) |
| NiP-15Mie.tdb | 1273.85 | NI12P5_H (x(P) 0.29412) + NI12P5_L (x(P) 0.29412) + M2P_C22 (x(P) 0.33333) |
| NiP-15Mie.tdb | 1273.85 | NI5P2_L (x(P) 0.28571) + NI12P5_H (x(P) 0.29412) + NI12P5_L (x(P) 0.29412) |
| NiP-15Mie.tdb | 1237.41 | LIQUID (x(P) 0.22459) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.28571) |
| NiP-15Mie.tdb | 1237.41 | LIQUID (x(P) 0.22476) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.28571) |
| NiP-15Mie.tdb | 1148.73 | FCC_A1 (x(P) 0.00305) + LIQUID (x(P) 0.18512) + M3P_D0E (x(P) 0.25) |
| NiP-15Mie.tdb | 1148.73 | FCC_A1 (x(P) 0.00305) + LIQUID (x(P) 0.18509) + M3P_D0E (x(P) 0.25) |
| NiP-89NPL.tdb | 1364.08 | NI5P2_H (x(P) 0.28571) + LIQUID (x(P) 0.31249) + M2P_C22 (x(P) 0.33333) |
| NiP-89NPL.tdb | 1344.54 | NI5P2_H (x(P) 0.28571) + NI12P5 (x(P) 0.29412) + M2P_C22 (x(P) 0.33333) |
| NiP-89NPL.tdb | 1307.84 | LIQUID (x(P) 0.25) + NI5P2_H (x(P) 0.28571) + NI12P5 (x(P) 0.29412) |
| NiP-89NPL.tdb | 1307.84 | LIQUID (x(P) 0.24996) + NI5P2_H (x(P) 0.28571) + NI12P5 (x(P) 0.29412) |
| NiP-89NPL.tdb | 1285.67 | LIQUID (x(P) 0.24152) + NI5P2_L (x(P) 0.28571) + NI12P5 (x(P) 0.29412) |
| NiP-89NPL.tdb | 1285.67 | LIQUID (x(P) 0.24147) + NI5P2_L (x(P) 0.28571) + NI12P5 (x(P) 0.29412) |
| NiP-89NPL.tdb | 1285.67 | LIQUID (x(P) 0.24143) + NI5P2_L (x(P) 0.28571) + NI12P5 (x(P) 0.29412) |
| NiP-89NPL.tdb | 1233.57 | LIQUID (x(P) 0.22024) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.28571) |
| NiP-89NPL.tdb | 1233.57 | LIQUID (x(P) 0.22049) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.28571) |
| NiP-89NPL.tdb | 1233.57 | LIQUID (x(P) 0.22021) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.28571) |
| NiP-89NPL.tdb | 1156.78 | FCC_A1 (x(P) 0.00302) + LIQUID (x(P) 0.18137) + M3P_D0E (x(P) 0.25) |
| NiP-89NPL.tdb | 1156.78 | FCC_A1 (x(P) 0.00302) + LIQUID (x(P) 0.18135) + M3P_D0E (x(P) 0.25) |
| NiP-89NPL.tdb | 1093.75 | M2P_C22 (x(P) 0.33333) + LIQUID (x(P) 0.41246) + NI6P5 (x(P) 0.45455) |
| NiP-89NPL.tdb | 1014.77 | NI5P2_L (x(P) 0.28571) + NI12P5 (x(P) 0.29412) + M2P_C22 (x(P) 0.33333) |
| NiP-89NPL.tdb | 548.56 | NI5P2_L (x(P) 0.28571) + M2P_C22 (x(P) 0.33333) + NI6P5 (x(P) 0.45455) |
| NiP-99Shi.tdb | 1423.3 | NI5P2_H (x(P) 0.286) + NI12P5_H (x(P) 0.294) + LIQUID (x(P) 0.29901) |
| NiP-99Shi.tdb | 1369.37 | NI12P5_H (x(P) 0.294) + LIQUID (x(P) 0.32034) + M2P_C22 (x(P) 0.33333) |
| NiP-99Shi.tdb | 1298.7 | LIQUID (x(P) 0.24095) + NI5P2_L (x(P) 0.286) + NI5P2_H (x(P) 0.286) |
| NiP-99Shi.tdb | 1298.7 | NI5P2_H (x(P) 0.286) + NI5P2_L (x(P) 0.286) + NI12P5_H (x(P) 0.294) |
| NiP-99Shi.tdb | 1273.89 | NI12P5_H (x(P) 0.294) + NI12P5_L (x(P) 0.294) + M2P_C22 (x(P) 0.33333) |
| NiP-99Shi.tdb | 1273.89 | NI5P2_L (x(P) 0.286) + NI12P5_H (x(P) 0.294) + NI12P5_L (x(P) 0.294) |
| NiP-99Shi.tdb | 1247.32 | LIQUID (x(P) 0.23242) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.286) |
| NiP-99Shi.tdb | 1247.32 | LIQUID (x(P) 0.2323) + M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.286) |
| NiP-99Shi.tdb | 1141.02 | FCC_A1 (x(P) 0.00337) + LIQUID (x(P) 0.19048) + M3P_D0E (x(P) 0.25) |
| NiP-99Shi.tdb | 1141.02 | FCC_A1 (x(P) 0.00337) + LIQUID (x(P) 0.19043) + M3P_D0E (x(P) 0.25) |
| NiP-99Shi.tdb | 425.36 | M3P_D0E (x(P) 0.25) + NI5P2_L (x(P) 0.286) + NI12P5_L (x(P) 0.294) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/NI/NI-P.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/NI/NI-P.json) · [CALPHAD hull NiP-89NPL](https://data.orchid-project.org/hulls/calphad-sgte/NI/NI-P--NiP-89NPL.json) · [CALPHAD hull NiP-99Shi](https://data.orchid-project.org/hulls/calphad-sgte/NI/NI-P--NiP-99Shi.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Ni–P system (8)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1399 | βNi5P2 + liquid = δNi12P5 | βNi5P2: P 0.286; liquid: P 0.311; δNi12P5: P 0.294 | unspecified | [1] Shim 1999 | Table 2, p. 4, row 9; `ORC-Q5V53SLFGH` |  |
| 1398 | βNi5P2 + liquid = δNi12P5 | βNi5P2: P 0.285714; δNi12P5: P 0.294118 | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 10; `ORC-ERFH5F6LN7` |  |
| 1373 | Liquid = δNi12P5 + Ni2P | Liquid: P 0.31; δNi12P5: P 0.294118; Ni2P: P 0.333333 | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 14; `ORC-V2MSZ62OFR` |  |
| 1368 | Liquid = δNi12P5 + Ni2P | Liquid: P 0.32; δNi12P5: P 0.294; Ni2P: P 0.333 | unspecified | [1] Shim 1999 | Table 2, p. 4, row 13; `ORC-PNTNS3RVRD` |  |
| 1244 | Liquid + αNi5P2 = Ni3P | Liquid: P 0.23; αNi5P2: P 0.286; Ni3P: P 0.25 | unspecified | [1] Shim 1999 | Table 2, p. 4, row 3; `ORC-MVLVMO6LNX` |  |
| 1243 | Liquid + αNi5P2 = Ni3P | Liquid: P 0.235; αNi5P2: P 0.285714; Ni3P: P 0.25 | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 4; `ORC-2ZHZOFPIAP` |  |
| 1143 | Liquid = f.c.c. + Ni3P | Liquid: P 0.19; f.c.c.: P 0.0032; Ni3P: P 0.25 | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 2; `ORC-ZNROLEKQYW` |  |
| 1141 | Liquid = f.c.c. + Ni3P | Liquid: P 0.19; f.c.c.: P 0.0032; Ni3P: P 0.25 | unspecified | [1] Shim 1999 | Table 2, p. 4, row 1; `ORC-GSRKYMTSYE` |  |

## Other properties

### Phase transition (8)

Table: Phase transition, Ni–P system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1273 K | 1273 | δNi12P5 = γNi12P5; _δNi12P5: P 0.294118; γNi12P5: P 0.294118_ | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 12; `ORC-2AP7TXUZXR` |  |
| Phase transition | 1273 K | 1273 | δNi12P5 = γNi12P5; _δNi12P5: P 0.294; γNi12P5: P 0.294118_ | unspecified | [1] Shim 1999 | Table 2, p. 4, row 11; `ORC-CM6ZVLMXXS` |  |
| Phase transition | 1298 K | 1298 | βNi5P2 = αNi5P2; _βNi5P2: P 0.285714; αNi5P2: P 0.285714_ | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 8; `ORC-6E6Q5DGXEX` |  |
| Phase transition | 1298 K | 1298 | βNi5P2 = αNi5P2; _βNi5P2: P 0.286; αNi5P2: P 0.285714_ | unspecified | [1] Shim 1999 | Table 2, p. 4, row 7; `ORC-IXLB34BAHF` |  |
| Phase transition | 1383 K | 1383 | Liquid = Ni2P; _Ni2P: P 0.333_ | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 16; `ORC-JE3HLJHKSW` |  |
| Phase transition | 1387 K | 1387 | Liquid = Ni2P; _Ni2P: P 0.333_ | unspecified | [1] Shim 1999 | Table 2, p. 4, row 15; `ORC-7S6E5DMVHG` |  |
| Phase transition | 1443 K | 1443 | Liquid = βNi5P2; _βNi5P2: P 0.285714_ | experimental | [1] Shim 1999; _cites Lee 1991_ | Table 2, p. 4, row 6; `ORC-RCFDW6R5GX` |  |
| Phase transition | 1446 K | 1446 | Liquid = βNi5P2; _βNi5P2: P 0.286_ | unspecified | [1] Shim 1999 | Table 2, p. 4, row 5; `ORC-SKPZDSMB7Y` |  |

## Sources

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

1. Jae-Hyeok Shim, Hun-Jae Chung, Dong Nyung Lee, Calculation of phase equilibria and evaluation of glass-forming ability of Ni–P alloys, Journal of Alloys and Compounds 282, 175-181 (1999). [doi:10.1016/s0925-8388(98)00826-3](https://doi.org/10.1016/s0925-8388%2898%2900826-3)

## 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/).