# Au system > Au system: 22 accepted literature values (crystal structure 14, formation 6, phase transition 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/AU.html · Markdown: https://data.orchid-project.org/systems/AU.md 22 accepted literature values from 7 paper(s) (experimental 13, model 5, DFT 1, unspecified 3); 0 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/AU.json) · [CSV](https://data.orchid-project.org/systems/AU.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AU) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AU.html) · [Markdown](https://data.orchid-project.org/systems/AU.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 13 | | model | 5 | | DFT | 1 | | unspecified | 3 | Table: Accepted values by property group | Property group | Values | |---|---:| | phase transition | 2 | | formation | 6 | | crystal structure | 14 | ## 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 system (6) | Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote | |---|---|---:|---:|---|---:|---:|---|---|---| | (Au) | | -22.594 kJ/mol-atom | 298.15 | experimental | | | [1] Murray 1987; _cites Ferro 1966_ | Table 4, p. 8, row 7; `ORC-DV5UH6CUFX` | | | (Au) | | -9.623 kJ/mol-atom | 298.15 | experimental | | | [1] Murray 1987; _cites Predel 1970_ [doi](https://doi.org/10.1016/0025-5416%2870%2990083-2) | Table 4, p. 8, row 10; `ORC-EQ2LL63WV6` | | | (Au) | | -8.033 kJ/mol-atom | 773.15 | experimental | | | [1] Murray 1987; _cites Predel 1970_ [doi](https://doi.org/10.1016/0025-5416%2870%2990083-2) | Table 4, p. 8, row 9; `ORC-JJB3GCBTIV` | | | (Au) | | -4.393 kJ/mol-atom | 298.15 | experimental | | | [1] Murray 1987; _cites Predel 1970_ [doi](https://doi.org/10.1016/0025-5416%2870%2990083-2) | Table 4, p. 8, row 8; `ORC-N5SHVAKEBX` | | | fcc(Au) | | -15.268 kJ/mol (basis unstated) | | model | | | [2] Liu 2003 | Table 3, p. 5, row 2; `ORC-XHTY356IIB` | | | fcc(Au) | | -14.411 kJ/mol (basis unstated) | 298.15 | experimental | | | [2] Liu 2003; _cites Carpenter 1967_ | Table 3, p. 5, row 1; `ORC-Q66EPRGZRO` | | ## Other properties ### Phase transition (2) Table: Phase transition, Au system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Phase transition | 1335.35 K | 1335.35 | Au | experimental | [1] Murray 1987; _cites ref. 00Hey_ | p. 1; `ORC-TKBGD4NZ5O.fd8533` | “Minor modifications in these temperatures m a y be necessary in the future because the melting points of A1 and Au assumed by \[00Hey\] to be 655 and 1062.2 ~ respectively, are now accepted as 660.452 and 1064.43 ~ \[Melt\]9” | | Phase transition | 1337.58 K | 1337.58 | Au | experimental | [1] Murray 1987 | p. 1; `ORC-TKBGD4NZ5O.3f5c83` | “Minor modifications in these temperatures m a y be necessary in the future because the melting points of A1 and Au assumed by \[00Hey\] to be 655 and 1062.2 ~ respectively, are now accepted as 660.452 and 1064.43 ~ \[Melt\]9” | ### Crystal structure (14) Table: Crystal structure, Au system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Lattice a | 4.157 Å | | Au; _Au: Au 1_ | DFT | [3] Shen 2021 | Table 3, p. 6, row 2; `ORC-CWU6N4T7H7.bf9f9f` | | | Lattice a | 4.0781 Å | 298.15 | (Au); _(Au): Au 1_ | unspecified | [1] Murray 1987 | Table 3, p. 6, row 40; `ORC-CL6WEMCJ4U.56b808` | | | Lattice a | 4.0784 Å | 298.15 | (Au); _(Au): Au 1_ | unspecified | [1] Murray 1987 | Table 3, p. 6, row 41; `ORC-UBVR3BSHEE.b15d29` | | | Lattice a | 4.0784 Å | 298.15 | Au; _Au: Au 1_ | model | [4] Moustaine 2016; _cites Gschneidner 1986_ | Table 1, p. 3, row 1; `ORC-47TZEDBEKT` | | | Lattice a | 4.0784 Å | 298.15 | Au; _Au: Au 1_ | unspecified | [3] Shen 2021 | Table 3, p. 6, row 1; `ORC-4Q7UINTFUT.493cb6` | | | Lattice a | 4.09 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 5; `ORC-DIGZCXSTVL` | | | Lattice a | 4.093 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 1; `ORC-DQ5VDQELIW` | | | Lattice a | 4.0784 Å | 298.15 | Au | model | [6] Dong 2013; _cites Gschneidner 1987_ | Table 1, p. 2, row 1; `ORC-FHAWR2SLYH` | | | Lattice a | 4.086 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 9; `ORC-I5LNPQWJ6Y` | | | Lattice a | 4.089 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 11; `ORC-IIVFLRKUEZ` | | | Lattice a | 4.087 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 3; `ORC-QT5Q2UOQWF` | | | Lattice a | 4.09 Å | 298.15 | Au | experimental | [5] Feutelais 1994 | Table 3, p. 2, row 7; `ORC-ZIQ6VVHKQB` | | | Lattice a | 4.072 Å | 298.15 | Au-fcc; _alloy: Au 1_ | model | [7] Ghasemi 2014; _cites Liu 2003_ [doi](https://doi.org/10.1016/s0364-5916%2803%2900028-2) | Table 1, p. 2, row 1; `ORC-2PCQQCMZNH` | | | Lattice a | 4.072 Å | 298.15 | Au-fcc | model | [7] Ghasemi 2014; _cites Liu 2003_ [doi](https://doi.org/10.1016/s0364-5916%2803%2900028-2) | Table 1, p. 2, row 20; `ORC-VW4ZLDISGT` | | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. J. L. Murray, H. Okamoto, T. B. Massalski, The Al−Au (Aluminum-gold) system, Bulletin of Alloy Phase Diagrams 8, 20-30 (1987). [doi:10.1007/bf02868887](https://doi.org/10.1007/bf02868887) 2. H.S. Liu, K. Ishida, Z.P. Jin, Y. Du, Thermodynamic assessment of the Au–Zn binary system, Intermetallics 11, 987-994 (2003). [doi:10.1016/s0966-9795(03)00115-8](https://doi.org/10.1016/s0966-9795%2803%2900115-8) 3. Chen Shen, Kun Hu, Ling Fan, Hongbin Zhang, Thermodynamic Reassessment of the Au-In Binary System Supported with First-Principles Calculations, J. Phase Equilib. Diffus. 42, 479-488 (2021). [doi:10.1007/s11669-021-00910-z](https://doi.org/10.1007/s11669-021-00910-z) 4. D. Moustaine, K. Mahdouk, Thermodynamic reassessment of the cerium gold binary system, Journal of Alloys and Compounds 683, 599-609 (2016). [doi:10.1016/j.jallcom.2016.05.116](https://doi.org/10.1016/j.jallcom.2016.05.116) 5. Y. Feutelais, D. Mouani, J. R. Didry, B. Legendre, The gold-tellurium system, JPE 15, 380-385 (1994). [doi:10.1007/bf02647557](https://doi.org/10.1007/bf02647557) 6. H.Q. Dong, X.M. Tao, T. Laurila, V. Vuorinen, M. Paulasto-Kröckel, Thermodynamic modeling of Au–Ce–Sn ternary system, Calphad 42, 38-50 (2013). [doi:10.1016/j.calphad.2013.07.013](https://doi.org/10.1016/j.calphad.2013.07.013) 7. M. Ghasemi, B. Sundman, S.G. Fries, J. Johansson, The thermodynamic assessment of the Au–In–Ga system, Journal of Alloys and Compounds 600, 178-185 (2014). [doi:10.1016/j.jallcom.2014.02.071](https://doi.org/10.1016/j.jallcom.2014.02.071) ## 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=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).