# B–Pr system

> B–Pr system: 39 accepted literature values (invariant reaction 31, phase transition 8) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

39 accepted literature values from 2 paper(s) (experimental 19, model 20); 0 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/B-PR.json) · [CSV](https://data.orchid-project.org/systems/B-PR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#B-PR) · [phases (10)](https://data.orchid-project.org/phases/pages/B-PR.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/B-PR.html) · [Markdown](https://data.orchid-project.org/systems/B-PR.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 19 |
| model | 20 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 31 |
| phase transition | 8 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/B/B-PR.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/B/B-PR.json) · [CALPHAD hull PrB-13Wan](https://data.orchid-project.org/hulls/calphad-sgte/B/B-PR--PrB-13Wan.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the B–Pr system (31)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2883 | congruent melting: liq. -> PrB6 | liq.: B 0.857143, Pr 0.142857; PrB6: B 0.857143, Pr 0.142857 | experimental | [1] Chen 2020; _cites Spear 1977_ | Table 4, p. 9, row 2; `ORC-NE2NGNZXH3` |  |
| 2883 | congruent melting: liq. -> PrB6 | liq.: B 0.8577; PrB6: B 0.857143, Pr 0.142857 | model | [1] Chen 2020 | Table 4, p. 9, row 1; `ORC-WI6XYR6IMK` |  |
| 2883 | congruent melting: liq. -> PrB6 | liq.: B 0.857; PrB6: B 0.857143, Pr 0.142857 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 3; `ORC-YNKZZT33OF` |  |
| 2623.25 | peritectic: L+B6Pr↔B4Pr | L: B 0.753; B6Pr: B 0.857; B4Pr: B 0.8 | model | [2] Wang 2013 | Table 5, p. 5, row 13; `ORC-3KE3LLDRUG` |  |
| 2623.15 | peritectic: L+B6Pr↔B4Pr | L: B 0.74; B6Pr: B 0.857; B4Pr: B 0.8 | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 11; `ORC-QCXR5JSPB3` |  |
| 2623.15 | peritectic: L+B6Pr↔B4Pr | L: B 0.75; B6Pr: B 0.857; B4Pr: B 0.8 | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 12; `ORC-QHEBUIHXNL` |  |
| 2623 | peritectic: liq. + PrB6 -> PrB4 | liq.: B 0.753; PrB6: B 0.857143, Pr 0.142857; PrB4: B 0.8, Pr 0.2 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 6; `ORC-RVVCOTJMJE` |  |
| 2623 | peritectic: liq. + PrB6 -> PrB4 | PrB6: B 0.857143, Pr 0.142857; PrB4: B 0.8, Pr 0.2 | experimental | [1] Chen 2020; _cites Spear 1977_ | Table 4, p. 9, row 5; `ORC-SVZFPFPDBS` |  |
| 2623 | peritectic: liq. + PrB6 -> PrB4 | liq.: B 0.5935; PrB6: B 0.857143, Pr 0.142857; PrB4: B 0.8, Pr 0.2 | model | [1] Chen 2020 | Table 4, p. 9, row 4; `ORC-WKCURL4JWT` |  |
| 2343.15 | peritectic: L+B4Pr↔B5Pr2 | L: B 0.66; B4Pr: B 0.8; B5Pr2: B 0.714 | model | [2] Wang 2013 | Table 5, p. 5, row 10; `ORC-BIAA4YBMDE` |  |
| 2343 | peritectic: liq. + PrB4 -> Pr2B5 | liq.: B 0.3284; PrB4: B 0.8, Pr 0.2; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020 | Table 4, p. 9, row 7; `ORC-ICCGBJVAPU` |  |
| 2343 | peritectic: liq. + PrB4 -> Pr2B5 | liq.: B 0.66; PrB4: B 0.8, Pr 0.2; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 8; `ORC-VYDRGUR7U7` |  |
| 2342 | eutectic: liq. -> PrB6 + rhombo(B) | liq.: B 0.9943; PrB6: B 0.857143, Pr 0.142857 | model | [1] Chen 2020 | Table 4, p. 9, row 9; `ORC-SEHKKTVZO4` |  |
| 2300.35 | eutectic: L↔B6Pr+(βB) | L: B 0.978; B6Pr: B 0.857; (βB): B 1 | model | [2] Wang 2013 | Table 5, p. 5, row 19; `ORC-S342YBLKWI` |  |
| 2300 | eutectic: liq. -> PrB6 + rhombo(B) | liq.: B 0.978; PrB6: B 0.857143, Pr 0.142857 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 11; `ORC-BXHBHTFXXE` |  |
| 2298.15 | eutectic: L↔B6Pr+(βB) | L: B 0.981; B6Pr: B 0.857; (βB): B 1 | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 18; `ORC-REWLYYEV54` |  |
| 2298.15 | eutectic: L↔B6Pr+(βB) | B6Pr: B 0.857; (βB): B 1 | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 17; `ORC-RG3V7RJTT6` |  |
| 2298 | eutectic: liq. -> PrB6 + rhombo(B) | PrB6: B 0.857143, Pr 0.142857 | experimental | [1] Chen 2020; _cites Spear 1977_ | Table 4, p. 9, row 10; `ORC-Z65HQF6YWI` |  |
| 2273.15 | peritectic: L+B4Pr↔B5Pr2 | L: B 0.66; B4Pr: B 0.807; B5Pr2: B 0.72 | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 9; `ORC-5FS3IHOPLO` |  |
| 1187 | eutectic: liq. -> Pr2B5 + bcc(Pr) | liq.: B 0.01; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 14; `ORC-XRVE2SWJGV` |  |
| 1186.65 | eutectic: L↔(βPr)+B5Pr2 | L: B 0.01; (βPr): B 0; B5Pr2: B 0.714 | model | [2] Wang 2013 | Table 5, p. 5, row 8; `ORC-C3YAIARJ2T` |  |
| 1183.15 | eutectic: L↔(βPr)+B5Pr2 | L: B 0.01; (βPr): B 0; B5Pr2: B 0.72 | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 6; `ORC-3RXDS6VVUF` |  |
| 1183.15 | eutectic: L↔(βPr)+B5Pr2 | L: B 0.01; (βPr): B 0; B5Pr2: B 0.714 | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 7; `ORC-X2HYCDSTZT` |  |
| 1183 | eutectic: liq. -> Pr2B5 + bcc(Pr) | Pr2B5: B 0.714286, Pr 0.285714 | experimental | [1] Chen 2020; _cites Spear 1977_ | Table 4, p. 9, row 13; `ORC-SRNEACUELN` |  |
| 1183 | eutectic: liq. -> Pr2B5 + bcc(Pr) | liq.: B 0.0125; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020 | Table 4, p. 9, row 12; `ORC-V4LN3AOB7W` |  |
| 1068.15 | peritectic: L+(βPr)↔(αPr) | L: B 0.001; (βPr): B 0; (αPr): B 0 | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 3; `ORC-NO7X7NGHUC` |  |
| 1068.15 | peritectic: L+(βPr)↔(αPr) | L: B 0; (αPr): B 0 | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 4; `ORC-VOE4JFMR6A` |  |
| 1068 | eutectoid: bcc(Pr) -> Pr2B5 + dhcp(Pr) | bcc(Pr): B 0; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020; _cites Wang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.03.001) | Table 4, p. 9, row 17; `ORC-2D2BJDXJ23` |  |
| 1068 | eutectoid: bcc(Pr) -> Pr2B5 + dhcp(Pr) | Pr2B5: B 0.714286, Pr 0.285714 | experimental | [1] Chen 2020; _cites Spear 1977_ | Table 4, p. 9, row 16; `ORC-K3OUA5TIP5` |  |
| 1068 | eutectoid: bcc(Pr) -> Pr2B5 + dhcp(Pr) | bcc(Pr): B 0; Pr2B5: B 0.714286, Pr 0.285714 | model | [1] Chen 2020 | Table 4, p. 9, row 15; `ORC-SGUXAMNECK` |  |
| 1067.95 | peritectic: L+(βPr)↔(αPr) | L: B 0; (βPr): B 0; (αPr): B 0 | model | [2] Wang 2013 | Table 5, p. 5, row 5; `ORC-MMD2CCZENT` |  |

## Other properties

### Phase transition (8)

Table: Phase transition, B–Pr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1204.15 K | 1204.15 | congruent melting: L↔(βPr); _(βPr): B 0_ | model | [2] Wang 2013 | Table 5, p. 5, row 2; `ORC-2Y27ORQCXW` |  |
| Phase transition | 1204.15 K | 1204.15 | congruent melting: L↔(βPr); _(βPr): B 0_ | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 1; `ORC-DJWCOD6FX3` |  |
| Phase transition | 2348.15 K | 2348.15 | congruent melting: L↔(βB); _(βB): B 1_ | model | [2] Wang 2013 | Table 5, p. 5, row 22; `ORC-R5FHAURD3W` |  |
| Phase transition | 2365.15 K | 2365.15 | congruent melting: L↔(βB); _(βB): B 1_ | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 20; `ORC-ANZLF2B4B5` |  |
| Phase transition | 2365.15 K | 2365.15 | congruent melting: L↔(βB); _(βB): B 1_ | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 21; `ORC-I7K25SGWW5` |  |
| Phase transition | 2883.15 K | 2883.15 | congruent melting: L↔B6Pr; _L: B 0.857; B6Pr: B 0.857_ | model | [2] Wang 2013 | Table 5, p. 5, row 16; `ORC-AVMKRWSSI7` |  |
| Phase transition | 2883.15 K | 2883.15 | congruent melting: L↔B6Pr; _L: B 0.857; B6Pr: B 0.857_ | experimental | [2] Wang 2013; _cites Moffatt 1976_ | Table 5, p. 5, row 15; `ORC-S77FTLVIUZ` |  |
| Phase transition | 2883.15 K | 2883.15 | congruent melting: L↔B6Pr; _L: B 0.857; B6Pr: B 0.857_ | experimental | [2] Wang 2013; _cites Spear 1976_ | Table 5, p. 5, row 14; `ORC-XFNBTLXZG6` |  |

## Sources

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

1. Taili Chen, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Pr–Fe–B system, Journal of Magnetism and Magnetic Materials 497, 165983 (2020). [doi:10.1016/j.jmmm.2019.165983](https://doi.org/10.1016/j.jmmm.2019.165983)
2. C.P. Wang, Y. Shi, D. Wang, Y. Lu, D.L. Zhao, X.J. Liu, Thermodynamic assessment of the B–Ce and B–Pr systems, Calphad 41, 150-155 (2013). [doi:10.1016/j.calphad.2013.03.001](https://doi.org/10.1016/j.calphad.2013.03.001)

## 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-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); 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); 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.

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_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/).