# Fe–La–O system

> Fe–La–O system: 24 accepted literature values (formation 10, activity / EMF / Gibbs energy 9, heat capacity / entropy / enthalpy 5) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/FE-LA-O.html · Markdown: https://data.orchid-project.org/systems/FE-LA-O.md

24 accepted literature values from 1 paper(s) (experimental 15, model 9); 0 calculated phase diagram(s).

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

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 15 |
| model | 9 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| formation | 10 |
| heat capacity / entropy / enthalpy | 5 |
| activity / EMF / Gibbs energy | 9 |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Fe–La–O system (4)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| LaFeO3 |  | -1373.48 kJ/mol (basis unstated) ± 2.61 | 298.15 | experimental |  |  | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 2; `ORC-XFO2BSHJ5P.f1064e` |  |
| LaFeO3 |  | -274.696 kJ/mol-atom ± 0.522 | 298.15 | experimental |  |  | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 2; `ORC-XFO2BSHJ5P.3298ce` |  |
| LaFeO3 |  | -273.64 kJ/mol-atom | 298.15 | model |  |  | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 1; `ORC-Y3ROVI6K5X` |  |
| LaFeO3 |  | -266.94 kJ/mol-atom | 298.15 | experimental |  |  | [1] Povoden-Karadeniz 2009; _cites Parida 1998_ [doi](https://doi.org/10.1016/s0925-8388%2898%2900699-9) | Table 1, p. 4, row 3; `ORC-ECDQUYQARF` |  |

## Other properties

### Formation (6)

Table: Formation, Fe–La–O system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| hm from compounds; _printed: Δf,oxides °H_ | -12.15 kJ/mol-atom | 298.15 | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 4; `ORC-TUO5UDNKGT` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -12.47 kJ/mol-atom | 975 | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 5; `ORC-47UO2JTKH2` |  |
| hm from compounds; _printed: Δf,oxides °H^LaFeO3_975 K_ | -12.916 kJ/mol-atom ± 0.78 | 975 | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 6; `ORC-OQCLETBQBP.6f5bb8` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -64.58 kJ/mol (basis unstated) ± 3.9 | 975 | LaFeO3 | experimental | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 6; `ORC-OQCLETBQBP.a862d7` |  |
| hm from compounds; _printed: Δf,oxides °H^LaFeO3_975 K_ | -12.92 kJ/mol-atom ± 0.78 | 975 | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 7; `ORC-QCJF6PUMS7.40be5a` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -64.6 kJ/mol (basis unstated) ± 3.9 | 975 | LaFeO3 | experimental | [1] Povoden-Karadeniz 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 4, row 7; `ORC-QCJF6PUMS7.45699e` |  |

### Heat capacity / entropy / enthalpy (5)

Table: Heat capacity / entropy / enthalpy, Fe–La–O system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: °S_ | 25.78 J/mol-atom/K | 298.15 | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Parida 1998_ [doi](https://doi.org/10.1016/s0925-8388%2898%2900699-9) | Table 1, p. 4, row 10; `ORC-HM5DEFEYEG` |  |
| Entropy; _printed: °S_ | 21.4 J/mol-atom/K | 298.15 | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 8; `ORC-OJFWXBYWMD` |  |
| Entropy; _printed: °S_ | 22.12 J/mol-atom/K | 298.15 | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Stlen 1998_ [doi](https://doi.org/10.1006/jcht.1997.0309) | Table 1, p. 4, row 9; `ORC-S7NYBSBFZR` |  |
| Entropy; _printed: °S_ | 49.8 J/mol-atom/K | 900 | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 11; `ORC-CVJVEQPS65` |  |
| Entropy; _printed: °S_ | 50.518 J/mol-atom/K | 900 | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Stlen 1998_ [doi](https://doi.org/10.1006/jcht.1997.0309) | Table 1, p. 4, row 12; `ORC-KGGSWUCS3V` |  |

### Activity / EMF / Gibbs energy (9)

Table: Activity / EMF / Gibbs energy, Fe–La–O system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy; _printed: Δ°G_ | -281993 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 15; `ORC-FQAAARFJOT.34d1fc` |  |
| Gibbs energy; _printed: Δ°G_ | -60267 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 28; `ORC-FSQREAZH6D.00133e` |  |
| Gibbs energy; _printed: Δ°G_ | -309700 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Nakamura 1979_ [doi](https://doi.org/10.1016/0025-5408%2879%2990048-5) | Table 1, p. 4, row 14; `ORC-OZ5W5XF7PB.44634c` |  |
| Gibbs energy; _printed: Δ°G_ | -287841 J/mol ± 1255 |  | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Kimizuka 1974_ | Table 1, p. 4, row 16; `ORC-RFXKSD4WKW.92308a` |  |
| Gibbs energy; _printed: Δ°G_ | -307364 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 13; `ORC-VGHL2A235B.d5c509` |  |
| Gibbs energy; _printed: Δ°G_ | -66066 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Kimizuka 1974_ | Table 1, p. 4, row 29; `ORC-YG4D5T4OJ5.0e974b` |  |
| Gibbs energy; _printed: Δ°G_ | -60625 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden-Karadeniz 2009 | Table 1, p. 4, row 26; `ORC-YYY2IMLHI7.34a979` |  |
| Gibbs energy; _printed: Δ°G_ | -62835 J/mol |  | LaFeO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden-Karadeniz 2009; _cites Nakamura 1979_ [doi](https://doi.org/10.1016/0025-5408%2879%2990048-5) | Table 1, p. 4, row 27; `ORC-ZH3Z447YNC.ffb782` |  |
| Gibbs energy; _printed: Δ°G_ | -287841 unknown ± 1255 |  | UNKNOWN | experimental | [1] Povoden-Karadeniz 2009; _cites Kimizuka 1974_ | Table 1, p. 4, row 16; `ORC-RFXKSD4WKW.e164df` |  |

## Sources

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

1. E. Povoden-Karadeniz, A. N. Grundy, M. Chen, T. Ivas, L. J. Gauckler, Thermodynamic Assessment of the La-Fe-O System, J. Phase Equilib. Diffus. 30, 351-366 (2009). [doi:10.1007/s11669-009-9501-6](https://doi.org/10.1007/s11669-009-9501-6)

## 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/).