# Cr–La–O system

> Cr–La–O system: 46 accepted literature values (phase transition 19, heat capacity / entropy / enthalpy 11, formation 9, activity / EMF / Gibbs energy 7) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

46 accepted literature values from 1 paper(s) (experimental 27, model 19); 0 calculated phase diagram(s). 7 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-LA-O.json) · [CSV](https://data.orchid-project.org/systems/CR-LA-O.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CR-LA-O) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CR-LA-O.html) · [Markdown](https://data.orchid-project.org/systems/CR-LA-O.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 27 |
| model | 19 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| phase transition | 19 |
| formation | 9 |
| heat capacity / entropy / enthalpy | 11 |
| activity / EMF / Gibbs energy | 7 |

## 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, Cr–La–O system (4)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| La2(CrO4)3 |  | -3961 kJ/mol (basis unstated) ± 11.7 | 298.15 | model |  |  | [1] Povoden 2009; _cites Tsyrenova_ | Table 1, p. 3, row 20; `ORC-JN4C2PPUJ4.0f14af` |  |
| La2(CrO4)3 |  | -3845 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Povoden 2009 | Table 1, p. 3, row 19; `ORC-L7HXY5H7MV` |  |
| La2(CrO4)3 |  | -233 kJ/mol-atom ± 11.7 | 298.15 | experimental |  |  | [1] Povoden 2009; _cites Tsyrenova_ | p. 2; `ORC-NASIHCQLC3` | “The enthalpy of formation of La2(CrO4)3 from the elements at 298 K was proposed by Tsyrenova et al.\[29\] to be -3961 ± 11.7 kJ mol-1.” |
| Rhombohedral LaCrO3 |  | -273.64 kJ/mol-atom | 298.15 | model |  |  | [1] Povoden 2009 | Table 1, p. 3, row 1; `ORC-2DIL2TDAIV.e5ab26` |  |

## Other properties

### Phase transition (19)

Table: Phase transition, Cr–La–O system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 509 K | 509 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Hashimoto 1998_ [doi](https://doi.org/10.1016/s0038-1098%2898%2900446-3) | Table 2, p. 3, row 19; `ORC-JLN3YSSBCW` |  |
| Phase transition | 523 K | 523 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Hashimoto 2000_ [doi](https://doi.org/10.1016/s0167-2738%2800%2900657-3) | Table 2, p. 3, row 16; `ORC-3MRKW4T7AE` |  |
| Phase transition | 530.5 K | 530.5 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Geller 1970_ [doi](https://doi.org/10.1103/physrevb.2.1167) | Table 2, p. 3, row 7; `ORC-MZJ4WRU2L2` |  |
| Phase transition | 533 K | 533 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Sakai 2000_ | Table 2, p. 3, row 18; `ORC-CLIN4SWGAJ` |  |
| Phase transition | 533 K | 533 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Tolochko 1985_ | Table 2, p. 3, row 12; `ORC-GWVDTUPAU6` |  |
| Phase transition | 533 K | 533 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Geller 1970_ [doi](https://doi.org/10.1103/physrevb.2.1167) | Table 2, p. 3, row 8; `ORC-IOE5CZLABT` |  |
| Phase transition | 533 K | 533 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Coutures 1980_ | Table 2, p. 3, row 10; `ORC-T43TD77ZQO` |  |
| Phase transition | 535 K | 535 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Momin 1991_ [doi](https://doi.org/10.1007/bf00720935) | Table 2, p. 3, row 14; `ORC-FNKJDPJI6I` |  |
| Phase transition | 536 K | 536 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Sakai 1995_ [doi](https://doi.org/10.1006/jcht.1995.0051) | Table 2, p. 3, row 4; `ORC-DXWSAOUG2R` |  |
| Phase transition | 540 K | 540 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Tolochko 1985_ | Table 2, p. 3, row 11; `ORC-2ABMZYNDVJ` |  |
| Phase transition | 540 K | 540 | polymorphic: Transition temperature, K | model | [1] Povoden 2009 | Table 2, p. 3, row 1; `ORC-L2WHBPF7EY` |  |
| Phase transition | 541 K | 541 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Hashimoto 2000_ [doi](https://doi.org/10.1016/s0167-2738%2800%2900657-3) | Table 2, p. 3, row 17; `ORC-5CN2NUQOZC` |  |
| Phase transition | 543 K | 543 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Korobeinikova 1976_ | Table 2, p. 3, row 2; `ORC-5O2T6Y7LEE` |  |
| Phase transition | 543 K | 543 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Terao 1973_ | Table 2, p. 3, row 9; `ORC-NVLPR356SE` |  |
| Phase transition | 544 K | 544 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Hofer 1993_ [doi](https://doi.org/10.1149/1.2220928) | Table 2, p. 3, row 3; `ORC-MBD5MSXRBY` |  |
| Phase transition | 545 K | 545 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Momin 1991_ [doi](https://doi.org/10.1007/bf00720935) | Table 2, p. 3, row 13; `ORC-4AZ5XFZHCV` |  |
| Phase transition | 550 K | 550 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Ruiz 1967_ | Table 2, p. 3, row 6; `ORC-FJJRY6RL6Q` |  |
| Phase transition | 550 K | 550 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Momin 1991_ [doi](https://doi.org/10.1007/bf00720935) | Table 2, p. 3, row 15; `ORC-JEQMZBCQ4T` |  |
| Phase transition | 563 K | 563 | polymorphic: Transition temperature, K | experimental | [1] Povoden 2009; _cites Pavlikov 1966_ | Table 2, p. 3, row 5; `ORC-4WZI2K25E2` |  |

### Formation (5)

Table: Formation, Cr–La–O system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| hm from compounds; _printed: Δf,oxides °H_ | -372 kJ/mol (basis unstated) | 298.15 | La2(CrO4)3 | model | [1] Povoden 2009 | Table 1, p. 3, row 22; `ORC-YIKHEXCOLC` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -8.11111 kJ/mol-atom | 298.15 | La2CrO6; _alloy: La 0.222222, O 0.666667_ | model | [1] Povoden 2009 | Table 1, p. 3, row 17; `ORC-CSEYTIMA6I` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -14.74 kJ/mol-atom | 298.15 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 2; `ORC-CBY2TYTTCS.a1193d` |  |
| hm from compounds; _printed: Δf,oxides °H_ | -12.47 kJ/mol-atom | 975 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 3; `ORC-422BQ7BXIJ.b2a111` |  |
| hm from compounds; _printed: Δf,oxides°H1078K_ | -14.612 kJ/mol-atom ± 0.558 | 1078 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Cheng 2005_ [doi](https://doi.org/10.1557/jmr.2005.0018) | Table 1, p. 3, row 4; `ORC-MQSV253O7B.5eead4` |  |

### Heat capacity / entropy / enthalpy (11)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: °S_ | 516 J/mol (basis unstated)/K | 298.15 | La2(CrO4)3 | model | [1] Povoden 2009 | Table 1, p. 3, row 21; `ORC-QTH6H3JHXA` |  |
| Entropy; _printed: °S_ | 36.6667 J/mol-atom/K | 298.15 | La2CrO6; _alloy: La 0.222222, O 0.666667_ | model | [1] Povoden 2009 | Table 1, p. 3, row 18; `ORC-UCMOKXGHKI` |  |
| Entropy; _printed: °S_ | 21.84 J/mol-atom/K | 298.15 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 5; `ORC-33TOGAOEJE.898212` |  |
| Heat content; _printed: H − H298K_ | 94.4 kJ mol−1 | 1090 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Yu 2005_ | Table 1, p. 3, row 12; `ORC-AQ36J245M4.4ba37b` |  |
| Heat content; _printed: H − H298K_ | 98.19 kJ mol−1 | 1090 | LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 11; `ORC-QDHXITW6IJ.268e3c` |  |
| Heat content; _printed: H - H298 K_ | 94.4 kJ mol^-1 | 1090 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Yu 2005_ | Table 1, p. 3, row 12; `ORC-AQ36J245M4.538ad9` |  |
| Heat content; _printed: H - H298 K_ | 98.19 kJ mol^-1 | 1090 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 11; `ORC-QDHXITW6IJ.596ebf` |  |
| Heat content; _printed: H − H298K_ | 139.2 kJ mol−1 | 1350 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Yu 2005_ | Table 1, p. 3, row 14; `ORC-BIABRTAVFI.ad6b31` |  |
| Heat content; _printed: H − H298K_ | 133.05 kJ mol−1 | 1350 | LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 13; `ORC-BZNOKFRUAU.b05236` |  |
| Heat content; _printed: H - H298 K_ | 139.2 kJ mol^-1 | 1350 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Yu 2005_ | Table 1, p. 3, row 14; `ORC-BIABRTAVFI.4dd6f6` |  |
| Heat content; _printed: H - H298 K_ | 133.05 kJ mol^-1 | 1350 | Rhombohedral LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 13; `ORC-BZNOKFRUAU.79215f` |  |

### Activity / EMF / Gibbs energy (7)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy; _printed: Δ°G_ | -42.29 unknown ± 0.38 | 1273 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Dudek 2007_ | Table 1, p. 3, row 8; `ORC-K4CYTW2737.9e9fe0` |  |
| Gibbs energy; _printed: Δ°G_ | -30.1 unknown ± 1.5 | 1273 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Chen 1987_ | Table 1, p. 3, row 7; `ORC-KZ5TCI5GQM.047831` |  |
| Gibbs energy; _printed: Δ°G_ | -76.75 kJ mol−1 | 1273 | LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 6; `ORC-OZ3MXO3U67.f5df90` |  |
| Gibbs energy; _printed: Δ°G_ | -76.75 kJ mol^-1 | 1273 | UNKNOWN; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 6; `ORC-OZ3MXO3U67.0aa7b9` |  |
| Gibbs energy; _printed: Δ°G_ | -78.9 unknown ± 1.1 | 2100 | LaCrO3; _alloy: La 0.2, O 0.6_ | experimental | [1] Povoden 2009; _cites Peck 1996_ [doi](https://doi.org/10.1111/j.1151-2916.1996.tb08104.x) | Table 1, p. 3, row 10; `ORC-TEIZ42UWR3.ea9d6f` |  |
| Gibbs energy; _printed: Δ°G_ | -79.52 kJ mol−1 | 2100 | LaCrO3; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 9; `ORC-XTU47GBHHM.73f671` |  |
| Gibbs energy; _printed: Δ°G_ | -79.52 kJ mol^-1 | 2100 | UNKNOWN; _alloy: La 0.2, O 0.6_ | model | [1] Povoden 2009 | Table 1, p. 3, row 9; `ORC-XTU47GBHHM.9b0ddb` |  |

## Sources

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

1. E. Povoden, M. Chen, A.N. Grundy, T. Ivas, L.J. Gauckler, Thermodynamic Assessment of the La-Cr-O System, J. Phase Equilib. Diffus. 30, 12-27 (2009). [doi:10.1007/s11669-008-9463-0](https://doi.org/10.1007/s11669-008-9463-0)

## 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/).