# C–Ce–La–Pr system

> C–Ce–La–Pr system: 23 accepted literature values (invariant reaction 21, crystal structure 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/C-CE-LA-PR.html · Markdown: https://data.orchid-project.org/systems/C-CE-LA-PR.md

23 accepted literature values from 1 paper(s) (experimental 9, model 12, unspecified 2); 0 calculated phase diagram(s).

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

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 9 |
| model | 12 |
| unspecified | 2 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 21 |
| crystal structure | 2 |

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the C–Ce–La–Pr system (21)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2544.15 | L \<-> βLaC2 + (C) | βLaC2: C 0.67 | experimental | [1] Peng 2011; _cites Spedding 1959_ | Table 4, p. 6, row 14; `ORC-L33MR7LJ54` |  |
| 2543.15 | L \<-> βCeC2 + (C) | βCeC2: C 0.6667; (C): C 1 | experimental | [1] Peng 2011; _cites Winchell 1967_ [doi](https://doi.org/10.1021/j100872a050) | Table 4, p. 6, row 26; `ORC-XV3VZY3GFS` |  |
| 2542.25 | L \<-> βCeC2 + (C) | L: C 0.689; βCeC2: C 0.6667; (C): C 1 | model | [1] Peng 2011 | Table 4, p. 6, row 25; `ORC-2PGYIAUHAC` |  |
| 2541.75 | L \<-> βLaC2 + (C) | L: C 0.701; βLaC2: C 0.663; (C): C 1 | model | [1] Peng 2011 | Table 4, p. 6, row 13; `ORC-WQ4Q6GPFSZ` |  |
| 2527.15 | L \<-> βPrC2 + (C) | (C): C 1 | experimental | [1] Peng 2011; _cites Conclusions_ | Table 4, p. 6, row 40; `ORC-B72HUAUWJP` |  |
| 2521.65 | L \<-> βPrC2 + (C) | L: C 0.704; βPrC2: C 0.665; (C): C 1 | model | [1] Peng 2011 | Table 4, p. 6, row 39; `ORC-UTJAKAPXVQ` |  |
| 1818.75 | L + βPrC2 \<-> Pr2C3 | L: C 0.5; βPrC2: C 0.657; Pr2C3: C 0.581 | model | [1] Peng 2011 | Table 4, p. 6, row 37; `ORC-7APZCV257W` |  |
| 1818.15 | L + βPrC2 \<-> Pr2C3 | L: C 0.5 | experimental | [1] Peng 2011; _cites Conclusions_ | Table 4, p. 6, row 38; `ORC-IHLK4BCWPV` |  |
| 1803.15 | L + βCeC2 \<-> Ce2C3 | βCeC2: C 0.6667; Ce2C3: C 0.6 | experimental | [1] Peng 2011; _cites Yupko 1970_ | Table 4, p. 6, row 24; `ORC-IBS2EBRRVL` |  |
| 1803.05 | L + βCeC2 \<-> Ce2C3 | L: C 0.505; βCeC2: C 0.6667; Ce2C3: C 0.6 | model | [1] Peng 2011 | Table 4, p. 6, row 23; `ORC-2SFYNGNQY2` |  |
| 1688.95 | L + βLaC2 \<-> La2C3 | L: C 0.5; βLaC2: C 0.645; La2C3: C 0.593 | model | [1] Peng 2011 | Table 4, p. 6, row 11; `ORC-JVDCK2J5EY` |  |
| 1688.15 | L + βLaC2 \<-> La2C3 | L: C 0.506; βLaC2: C 0.631; La2C3: C 0.6 | experimental | [1] Peng 2011; _cites Spedding 1959_ | Table 4, p. 6, row 12; `ORC-CRMACOYYQM` |  |
| 1354.95 | βLaC2 \<-> La2C3 + αLaC2 | βLaC2: C 0.662; La2C3: C 0.599; αLaC2: C 0.667; LaC2C3: C 0.599 | model | [1] Peng 2011 | Table 4, p. 6, row 7; `ORC-X3VJKKIHL7` |  |
| 1148.15 | L + (γLa) \<-> (βLa) | L: C 0.057; (γLa): C 0.028; (βLa): C 0.038 | experimental | [1] Peng 2011; _cites Spedding 1959_ | Table 4, p. 6, row 6; `ORC-OWYQSP7WMX` |  |
| 1146.55 | L + (γLa) \<-> (βLa) | L: C 0.063; (γLa): C 0.025; (βLa): C 0.028 | model | [1] Peng 2011 | Table 4, p. 6, row 5; `ORC-JUFO7IEOLK` |  |
| 1080.05 | L \<-> (βLa) + La2C3 | L: C 0.209; (βLa): C 0.045; La2C3: C 0.578 | model | [1] Peng 2011 | Table 4, p. 6, row 3; `ORC-LB7QP5FEEC` |  |
| 1079.15 | L \<-> (βLa) + La2C3 | L: C 0.206; (βLa): C 0.044; La2C3: C 0.548 | experimental | [1] Peng 2011; _cites Spedding 1959_ | Table 4, p. 6, row 4; `ORC-B7Y5VVGQB5` |  |
| 1073.15 | L \<-> (βPr) + Pr2C3 | L: C 0.15 | experimental | [1] Peng 2011; _cites Conclusions_ | Table 4, p. 6, row 32; `ORC-MILAU4PCY4` |  |
| 1071.05 | L \<-> (βPr) + Pr2C3 | L: C 0.155; (βPr): C 0.077; Pr2C3: C 0.544 | model | [1] Peng 2011 | Table 4, p. 6, row 31; `ORC-AF3HAJ2QHJ` |  |
| 1017.15 | L + (δCe) \<-> (γCe) | L: C 0.062; (δCe): C 0.013; (γCe): C 0.019 | model | [1] Peng 2011 | Table 4, p. 6, row 18; `ORC-L5AZOAE6MI` |  |
| 911.45 | L \<-> (γCe) + Ce2C3 | L: C 0.192; (γCe): C 0.044; Ce2C3: C 0.6 | model | [1] Peng 2011 | Table 4, p. 6, row 17; `ORC-KORMYTBBSS` |  |

## Other properties

### Crystal structure (2)

Table: Crystal structure, C–Ce–La–Pr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 2.52 Å | 298.15 | (C); _alloy: Ce 0, La 0, Pr 0_ | unspecified | [1] Peng 2011; _cites Fayos 1999_ [doi](https://doi.org/10.1006/jssc.1999.8448) | Table 1, p. 2, row 17; `ORC-O2L6DKKC6H.11f412` |  |
| Lattice c | 4.12 Å | 298.15 | (C); _alloy: Ce 0, La 0, Pr 0_ | unspecified | [1] Peng 2011; _cites Fayos 1999_ [doi](https://doi.org/10.1006/jssc.1999.8448) | Table 1, p. 2, row 17; `ORC-O2L6DKKC6H.773298` |  |

## Sources

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

1. Yingbiao Peng, Yong Du, Lijun Zhang, Chunsheng Sha, Shuhong Liu, Feng Zheng et al., Thermodynamic modeling of the C–RE (RE=La, Ce and Pr) systems, Calphad 35, 533-541 (2011). [doi:10.1016/j.calphad.2011.09.002](https://doi.org/10.1016/j.calphad.2011.09.002)

## 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/).