# Au–La system

> Au–La system: 43 accepted literature values (crystal structure 19, invariant reaction 10, phase transition 8, formation 6) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

43 accepted literature values from 1 paper(s) (experimental 9, model 10, DFT 24); 1 calculated phase diagram(s). 2 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/AU-LA.json) · [CSV](https://data.orchid-project.org/systems/AU-LA.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AU-LA) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AU-LA/AuLa-11Don.json) · [phases (11)](https://data.orchid-project.org/phases/pages/AU-LA.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AU-LA.html) · [Markdown](https://data.orchid-project.org/systems/AU-LA.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 9 |
| model | 10 |
| DFT | 24 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 10 |
| phase transition | 8 |
| formation | 6 |
| crystal structure | 19 |

## 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 |
|---|---|---|---|
| AuLa-11Don.tdb | H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Krockel, J. Alloys Compd., 509, 4439-44(2011). [doi:10.1016/j.jallcom.2011.01.072](https://doi.org/10.1016/j.jallcom.2011.01.072) | `7e2c02c7ae6c5d0b2ce49f6a696d13b9f4d58f4c7b99ec2a19e980ef9c86e024` | [viewer](https://orchid-project.org/phase-diagrams/#AU-LA/AuLa-11Don.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AuLa-11Don.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AuLa-11Don.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| AuLa-11Don.tdb | 1418.8 | AU2LA (x(La) 0.33333) + LIQUID (x(La) 0.39545) + AULA_B33 (x(La) 0.5) |
| AuLa-11Don.tdb | 1418.8 | AU2LA (x(La) 0.33333) + LIQUID (x(La) 0.3955) + AULA_B33 (x(La) 0.5) |
| AuLa-11Don.tdb | 1418.8 | AU2LA (x(La) 0.33333) + LIQUID (x(La) 0.39542) + AULA_B33 (x(La) 0.5) |
| AuLa-11Don.tdb | 1402.15 | AU51LA14 (x(La) 0.21538) + LIQUID (x(La) 0.26851) + AU2LA (x(La) 0.33333) |
| AuLa-11Don.tdb | 1402.15 | AU51LA14 (x(La) 0.21538) + LIQUID (x(La) 0.26862) + AU2LA (x(La) 0.33333) |
| AuLa-11Don.tdb | 1174.59 | LIQUID (x(La) 0.11584) + AU6LA (x(La) 0.14286) + AU51LA14 (x(La) 0.21538) |
| AuLa-11Don.tdb | 1174.59 | LIQUID (x(La) 0.11595) + AU6LA (x(La) 0.14286) + AU51LA14 (x(La) 0.21538) |
| AuLa-11Don.tdb | 1134 | LIQUID (x(La) 0.96871) + FCC_A1 (x(La) 1) + BCC_A2 (x(La) 1) |
| AuLa-11Don.tdb | 1053.53 | FCC_A1 (x(La) 0) + LIQUID (x(La) 0.06611) + AU6LA (x(La) 0.14286) |
| AuLa-11Don.tdb | 1053.53 | FCC_A1 (x(La) 0) + LIQUID (x(La) 0.06611) + AU6LA (x(La) 0.14286) |
| AuLa-11Don.tdb | 1053.53 | FCC_A1 (x(La) 0) + LIQUID (x(La) 0.06607) + AU6LA (x(La) 0.14286) |
| AuLa-11Don.tdb | 941.33 | AULA_B33 (x(La) 0.5) + AULA2_C37 (x(La) 0.66667) + LIQUID (x(La) 0.75851) |
| AuLa-11Don.tdb | 941.33 | AULA_B33 (x(La) 0.5) + AULA2_C37 (x(La) 0.66667) + LIQUID (x(La) 0.7585) |
| AuLa-11Don.tdb | 932.92 | AULA_B33 (x(La) 0.5) + AULA_B27 (x(La) 0.5) + AULA2_C37 (x(La) 0.66667) |
| AuLa-11Don.tdb | 932.92 | AU2LA (x(La) 0.33333) + AULA_B27 (x(La) 0.5) + AULA_B33 (x(La) 0.5) |
| AuLa-11Don.tdb | 826.73 | AULA2_C37 (x(La) 0.66667) + LIQUID (x(La) 0.83377) + FCC_A1 (x(La) 1) |
| AuLa-11Don.tdb | 826.73 | AULA2_C37 (x(La) 0.66667) + LIQUID (x(La) 0.83377) + FCC_A1 (x(La) 1) |
| AuLa-11Don.tdb | 550 | AULA2_C37 (x(La) 0.66667) + DHCP (x(La) 1) + FCC_A1 (x(La) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/AU/AU-LA.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/AU/AU-LA.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Au–La system (10)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1421 | L \<=> βAuLa + Au2La | L: La 0.373; βAuLa: La 0.5; Au2La: La 0.333333 | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 11; `ORC-5JXNBF4W4O` |  |
| 1419 | L \<=> βAuLa + Au2La | L: La 0.395; βAuLa: La 0.5; Au2La: La 0.333333 | model | [1] Dong 2011 | Table 3, p. 4, row 12; `ORC-EJ2IYGFPQ7` |  |
| 1402 | L \<=> Au2La + Au51La14 | L: La 0.269; Au2La: La 0.333333; Au51La14: La 0.215385 | model | [1] Dong 2011 | Table 3, p. 4, row 14; `ORC-262KIKFYMN` |  |
| 1327 | L \<=> Au2La + Au51La14 | L: La 0.31; Au2La: La 0.333333; Au51La14: La 0.215385 | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 13; `ORC-DB27BWTXM2` |  |
| 1175 | L + Au51La14 \<=> Au6La | L: La 0.116; Au51La14: La 0.215385; Au6La: La 0.142857 | model | [1] Dong 2011 | Table 3, p. 4, row 18; `ORC-X3Q77M45ML` |  |
| 1054 | L \<=> Au6La + Au(fcc) | L: La 0.066; Au6La: La 0.142857 | model | [1] Dong 2011 | Table 3, p. 4, row 15; `ORC-3UPRGTADY2` |  |
| 941 | L + βAuLa \<=> AuLa2 | L: La 0.758; βAuLa: La 0.5; AuLa2: La 0.666667 | model | [1] Dong 2011 | Table 3, p. 4, row 10; `ORC-OC5GEJFTSR` |  |
| 938 | L + βAuLa \<=> AuLa2 | L: La 0.751; βAuLa: La 0.5; AuLa2: La 0.666667 | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 9; `ORC-JYQJZXLGVI` |  |
| 834 | L \<=> La(fcc) + AuLa2 | L: La 0.84; AuLa2: La 0.666667 | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 1; `ORC-KDXZBM4AYY` |  |
| 827 | L \<=> La(fcc) + AuLa2 | L: La 0.834; AuLa2: La 0.666667 | model | [1] Dong 2011 | Table 3, p. 4, row 2; `ORC-LXQPSRVONX` |  |

## 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, Au–La system (6)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Au2La |  | -81.5 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2011 | Table 1, p. 3, row 7; `ORC-M7JVPQSGME.53fdbe` |  |
| Au51La14 | [Au51La14](https://data.orchid-project.org/compounds/Au51La14.html) | -57.9 kJ/mol-atom ± 1.9 | 298.15 | experimental | -64.007 (mp-aaacrqeg) |  | [1] Dong 2011 | Table 1, p. 3, row 9; `ORC-FGXMOAZRUE.72a03f` |  |
| AuLa2 |  | -56.6 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2011 | Table 1, p. 3, row 1; `ORC-MSSDVLYGNI.2003ff` |  |
| AuLa6 |  | -45.1 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2011 | Table 1, p. 3, row 11; `ORC-5B5ZMEUOXD.9dd7b4` |  |
| αAuLa |  | -82 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2011 | Table 1, p. 3, row 3; `ORC-25SJ3HS3UY.68bc59` |  |
| βAuLa |  | -82.5 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2011 | Table 1, p. 3, row 5; `ORC-HQD2ACWTYR.1c9c87` |  |

## Other properties

### Phase transition (8)

Table: Phase transition, Au–La system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 933 K | 933 | βAuLa \<=> αAuLa; _βAuLa: La 0.5; αAuLa: La 0.5_ | model | [1] Dong 2011 | Table 3, p. 4, row 17; `ORC-JGFL7KBCC5` |  |
| Phase transition | 933 K | 933 | βAuLa \<=> αAuLa; _βAuLa: La 0.5; αAuLa: La 0.5_ | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 16; `ORC-M7FFTSDFAQ` |  |
| Phase transition | 1477 K | 1477 | L \<=> Au51La14; _L: La 0.215385; Au51La14: La 0.215385_ | model | [1] Dong 2011 | Table 3, p. 4, row 8; `ORC-FO2IG6KTA2` |  |
| Phase transition | 1477 K | 1477 | L \<=> Au51La14; _L: La 0.215; Au51La14: La 0.215385_ | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 7; `ORC-OZ2VOZ3L7K` |  |
| Phase transition | 1487 K | 1487 | L \<=> Au2La; _L: La 0.333; Au2La: La 0.333333_ | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 5; `ORC-NRRKCQ6STC` |  |
| Phase transition | 1490 K | 1490 | L \<=> Au2La; _L: La 0.333333; Au2La: La 0.333333_ | model | [1] Dong 2011 | Table 3, p. 4, row 6; `ORC-IRSSSWWTX2` |  |
| Phase transition | 1596 K | 1596 | L \<=> βAuLa; _L: La 0.5; βAuLa: La 0.5_ | model | [1] Dong 2011 | Table 3, p. 4, row 4; `ORC-NDJF46HGO5` |  |
| Phase transition | 1598 K | 1598 | L \<=> βAuLa; _L: La 0.5; βAuLa: La 0.5_ | experimental | [1] Dong 2011; _cites Massalski 1990_ | Table 3, p. 4, row 3; `ORC-RJ6WI76HBZ` |  |

### Crystal structure (19)

Table: Crystal structure, Au–La system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a; _printed: a_ | 4.7 Å |  | Au2La; _alloy: La 0.333333_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 8; `ORC-5DBB3LE7SY.ee104b` |  |
| Lattice a; _printed: Lattice parameter a_ | 4.7 Å | 0 | Au2La; _alloy: La 0.333333_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 7; `ORC-VKRICDEU5Q.144378` |  |
| Lattice a; _printed: a_ | 12.87 Å |  | Au51La14; _alloy: La 0.215385_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 10; `ORC-D6SZZ5OYMZ.110fc1` |  |
| Lattice a; _printed: a_ | 7.397 Å | 0 | AuLa2; _alloy: La 0.666667_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 1; `ORC-ER6PTUS7DN.d6ec64` |  |
| Lattice a; _printed: a_ | 7.52 Å |  | αAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 4; `ORC-C3W6COYE2Y.077d59` |  |
| Lattice a; _printed: Lattice parameter a_ | 7.52 Å | 0 | αAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 3; `ORC-JZHNWAGYTU.6ecd5b` |  |
| Lattice a; _printed: a_ | 3.95 Å |  | βAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 6; `ORC-ATJBR547E5.3e2e8a` |  |
| Lattice a; _printed: a_ | 3.95 Å | 0 | βAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 5; `ORC-TZSDYPRQO6.452983` |  |
| Lattice b; _printed: b_ | 7.295 Å |  | Au2La; _alloy: La 0.333333_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 8; `ORC-5DBB3LE7SY.8e25a7` |  |
| Lattice b; _printed: b_ | 7.295 Å | 0 | Au2La; _alloy: La 0.333333_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 7; `ORC-VKRICDEU5Q.c2e12c` |  |
| Lattice b; _printed: b_ | 4.69 Å |  | αAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 4; `ORC-C3W6COYE2Y.f05377` |  |
| Lattice b; _printed: Lattice parameter b_ | 4.69 Å | 0 | αAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 3; `ORC-JZHNWAGYTU.c28c5f` |  |
| Lattice b; _printed: b_ | 11.2 Å |  | βAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 6; `ORC-ATJBR547E5.8474ff` |  |
| Lattice b; _printed: b_ | 11.2 Å | 0 | βAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 5; `ORC-TZSDYPRQO6.c0b009` |  |
| Lattice c; _printed: Lattice parameter c_ | 8.155 Å | 0 | Au2La; _alloy: La 0.333333_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 7; `ORC-VKRICDEU5Q.d78df5` |  |
| Lattice c; _printed: c_ | 9.388 Å |  | Au51La14; _alloy: La 0.215385_ | DFT | [1] Dong 2011; _cites McMasters 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990125-1) | Table 1, p. 3, row 10; `ORC-D6SZZ5OYMZ.1b1363` |  |
| Lattice c; _printed: c_ | 9.41 Å | 0 | AuLa2; _alloy: La 0.666667_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 1; `ORC-ER6PTUS7DN.2ba83b` |  |
| Lattice c; _printed: Lattice parameter c_ | 5.96 Å | 0 | αAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 3; `ORC-JZHNWAGYTU.9f7404` |  |
| Lattice c; _printed: c_ | 4.78 Å | 0 | βAuLa; _alloy: La 0.5_ | DFT | [1] Dong 2011 | Table 1, p. 3, row 5; `ORC-TZSDYPRQO6.b31c36` |  |

## Sources

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

1. H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011). [doi:10.1016/j.jallcom.2011.01.072](https://doi.org/10.1016/j.jallcom.2011.01.072)

## 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/).