# Hg–Mg system

> Hg–Mg system: 34 accepted literature values (invariant reaction 34) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/HG-MG.html · Markdown: https://data.orchid-project.org/systems/HG-MG.md

34 accepted literature values from 1 paper(s) (experimental 15, model 19); 1 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/HG-MG.json) · [CSV](https://data.orchid-project.org/systems/HG-MG.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#HG-MG) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#HG-MG/HgMg-09Fen.json) · [phases (11)](https://data.orchid-project.org/phases/pages/HG-MG.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/HG-MG.html) · [Markdown](https://data.orchid-project.org/systems/HG-MG.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 15 |
| model | 19 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 34 |

## 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 |
|---|---|---|---|
| HgMg-09Fen.tdb | Y. Feng, R.C. Wang, C.Q. Peng, H.S. Liu, J. Cent. South Univ. Technol., 16, 32-37(2009). [doi:10.1007/s11771-009-0005-7](https://doi.org/10.1007/s11771-009-0005-7) | `ddfcb316b5d22cbe0e8b20b9011d76839b690b3dd89aa94776c37796d273f926` | [viewer](https://orchid-project.org/phase-diagrams/#HG-MG/HgMg-09Fen.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HgMg-09Fen.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HgMg-09Fen.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| HgMg-09Fen.tdb | 833.84 | HG3MG5_D88 (x(Mg) 0.625) + LIQUID (x(Mg) 0.63028) + HGMG2_C37 (x(Mg) 0.66667) |
| HgMg-09Fen.tdb | 833.84 | HG3MG5_D88 (x(Mg) 0.625) + LIQUID (x(Mg) 0.63034) + HGMG2_C37 (x(Mg) 0.66667) |
| HgMg-09Fen.tdb | 833.84 | HG3MG5_D88 (x(Mg) 0.625) + LIQUID (x(Mg) 0.63016) + HGMG2_C37 (x(Mg) 0.66667) |
| HgMg-09Fen.tdb | 830.89 | HGMG_B2 (x(Mg) 0.5) + LIQUID (x(Mg) 0.60213) + HG3MG5_D88 (x(Mg) 0.625) |
| HgMg-09Fen.tdb | 830.88 | HGMG_B2 (x(Mg) 0.5) + LIQUID (x(Mg) 0.60205) + HG3MG5_D88 (x(Mg) 0.625) |
| HgMg-09Fen.tdb | 794.16 | HGMG2_C37 (x(Mg) 0.66667) + HG2MG5 (x(Mg) 0.71429) + LIQUID (x(Mg) 0.75895) |
| HgMg-09Fen.tdb | 794.16 | HGMG2_C37 (x(Mg) 0.66667) + HG2MG5 (x(Mg) 0.71429) + LIQUID (x(Mg) 0.75887) |
| HgMg-09Fen.tdb | 780.47 | HG2MG5 (x(Mg) 0.71429) + HGMG3 (x(Mg) 0.75) + LIQUID (x(Mg) 0.7807) |
| HgMg-09Fen.tdb | 780.47 | HG2MG5 (x(Mg) 0.71429) + HGMG3 (x(Mg) 0.75) + LIQUID (x(Mg) 0.78053) |
| HgMg-09Fen.tdb | 780.47 | HG2MG5 (x(Mg) 0.71429) + HGMG3 (x(Mg) 0.75) + LIQUID (x(Mg) 0.78075) |
| HgMg-09Fen.tdb | 718.95 | HGMG3 (x(Mg) 0.75) + LIQUID (x(Mg) 0.85482) + HCP_A3 (x(Mg) 0.98164) |
| HgMg-09Fen.tdb | 718.95 | HGMG3 (x(Mg) 0.75) + LIQUID (x(Mg) 0.85484) + HCP_A3 (x(Mg) 0.98165) |
| HgMg-09Fen.tdb | 441.1 | LIQUID (x(Mg) 0.18681) + HG2MG_C11B (x(Mg) 0.33333) + HGMG_B2 (x(Mg) 0.5) |
| HgMg-09Fen.tdb | 441.1 | LIQUID (x(Mg) 0.18696) + HG2MG_C11B (x(Mg) 0.33333) + HGMG_B2 (x(Mg) 0.5) |

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

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Hg–Mg system (34)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 903 | congruent melting: L↔MgHg | MgHg: Hg 0.5 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 24; `ORC-HBDTSP7KIT` |  |
| 900 | congruent melting: L↔MgHg | MgHg: Hg 0.5 | experimental | [1] Feng 2009; _cites ref. 26_ | Table 6, p. 5, row 25; `ORC-QC5SJ2QF7N` |  |
| 899 | congruent melting: L↔MgHg | MgHg: Hg 0.5 | model | [1] Feng 2009 | Table 6, p. 5, row 27; `ORC-UDZR5ANPY5` |  |
| 889 | congruent melting: L↔MgHg | MgHg: Hg 0.5 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 26; `ORC-KSYCYSWC2R` |  |
| 853 | congruent melting: L↔Mg2Hg | Mg2Hg: Hg 0.3333 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 11; `ORC-NCYB7WMBBG` |  |
| 847 | congruent melting: L↔Mg2Hg | Mg2Hg: Hg 0.333 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 13; `ORC-GH6KRFCTTV` |  |
| 843 | congruent melting: L↔Mg2Hg | Mg2Hg: Hg 0.3333 | experimental | [1] Feng 2009; _cites ref. 26_ | Table 6, p. 5, row 12; `ORC-IJ7YTPRHO4` |  |
| 842 | congruent melting: L↔Mg2Hg | Mg2Hg: Hg 0.333 | model | [1] Feng 2009 | Table 6, p. 5, row 14; `ORC-CLL4UHYJVD` |  |
| 835 | congruent melting: L↔Mg5Hg3 | Mg5Hg3: Hg 0.375 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 18; `ORC-2XIYRO5PZZ` |  |
| 835 | congruent melting: L↔Mg5Hg3 | L: Hg 0.375, Mg 0.625; Mg5Hg3: Hg 0.375, Mg 0.625 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 19; `ORC-CCHALUCUVJ` |  |
| 834 | congruent melting: L↔Mg5Hg3 | Mg5Hg3: Hg 0.375 | model | [1] Feng 2009 | Table 6, p. 5, row 20; `ORC-YDLZTA3SMS` |  |
| 833.5 | eutectic: L↔Mg2Hg+Mg5Hg3 | L: Hg 0.371; Mg2Hg: Hg 0.333; Mg5Hg3: Hg 0.375 | model | [1] Feng 2009 | Table 6, p. 5, row 17; `ORC-MNNA2IXQ5N` |  |
| 833 | eutectic: L↔MgHg+Mg5Hg3 | L: Hg 0.4; MgHg: Hg 0.5; Mg5Hg3: Hg 0.375 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 21; `ORC-CJMXYEHUJK` |  |
| 832 | eutectic: L↔MgHg+Mg5Hg3 | MgHg: Hg 0.5, Mg 0.5; Mg5Hg3: Hg 0.375, Mg 0.625 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 22; `ORC-FIBTQSWMOK` |  |
| 831 | eutectic: L↔Mg2Hg+Mg5Hg3 | L: Hg 0.362; Mg2Hg: Hg 0.3333; Mg5Hg3: Hg 0.375 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 15; `ORC-J4Y7RUFZV3` |  |
| 831 | eutectic: L↔Mg2Hg+Mg5Hg3 | Mg2Hg: Hg 0.333333, Mg 0.666667; Mg5Hg3: Hg 0.375, Mg 0.625 | experimental | [1] Feng 2009; _cites ref. 28_ | Table 6, p. 5, row 16; `ORC-O7BQ4TATHC` |  |
| 831 | eutectic: L↔MgHg+Mg5Hg3 | L: Hg 0.398; MgHg: Hg 0.5; Mg5Hg3: Hg 0.375 | model | [1] Feng 2009 | Table 6, p. 5, row 23; `ORC-XWXG3Q5LDH` |  |
| 791 | peritectic: L+Mg2Hg↔Mg5Hg2 | L: Hg 0.237; Mg2Hg: Hg 0.333; Mg5Hg2: Hg 0.286 | model | [1] Feng 2009 | Table 6, p. 5, row 10; `ORC-I2SJZNEFQO` |  |
| 790 | peritectic: L+Mg2Hg↔Mg5Hg2 | Mg2Hg: Hg 0.333333, Mg 0.666667; Mg5Hg2: Hg 0.285714, Mg 0.714286 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 9; `ORC-76Q7DLMH54` |  |
| 788 | peritectic: L+Mg2Hg↔Mg5Hg2 | L: Hg 0.25; Mg2Hg: Hg 0.3333; Mg5Hg2: Hg 0.2857 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 8; `ORC-HY5VY3VQ2H` |  |
| 781.7 | peritectic: L+Mg5Hg2↔Mg3Hg | L: Hg 0.223; Mg5Hg2: Hg 0.286; Mg3Hg: Hg 0.25 | model | [1] Feng 2009 | Table 6, p. 5, row 7; `ORC-WPSDGJJXIT` |  |
| 781 | peritectic: L+Mg5Hg2↔Mg3Hg | L: Hg 0.24; Mg5Hg2: Hg 0.2857; Mg3Hg: Hg 0.25 | experimental | [1] Feng 2009; _cites ref. 26_ | Table 6, p. 5, row 5; `ORC-BPXI66NAZS` |  |
| 771 | peritectic: L+Mg5Hg2↔Mg3Hg | Mg5Hg2: Hg 0.285714, Mg 0.714286; Mg3Hg: Hg 0.25, Mg 0.75 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 6; `ORC-7L7WYCG2NA` |  |
| 731 | eutectic: L↔(Mg)+Mg3Hg | L: Hg 0.17; (Mg): Hg 0.0045; Mg3Hg: Hg 0.25 | experimental | [1] Feng 2009; _cites ref. 25_ | Table 6, p. 5, row 1; `ORC-XDCJHEVH3D` |  |
| 727 | eutectic: L↔(Mg)+Mg3Hg | Mg3Hg: Hg 0.25, Mg 0.75 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 3; `ORC-JDHSB6XYIF` |  |
| 721 | eutectic: L↔(Mg)+Mg3Hg | L: Hg 0.175; (Mg): Hg 0.012; Mg3Hg: Hg 0.25 | experimental | [1] Feng 2009; _cites ref. 26_ | Table 6, p. 5, row 2; `ORC-LVLFYZANKZ` |  |
| 719.6 | eutectic: L↔(Mg)+Mg3Hg | L: Hg 0.146; (Mg): Hg 0.02; Mg3Hg: Hg 0.25 | model | [1] Feng 2009 | Table 6, p. 5, row 4; `ORC-SSY4M22QOD` |  |
| 444 | peritectic: L+MgHg↔MgHg2 | MgHg: Hg 0.5, Mg 0.5; MgHg2: Hg 0.666667, Mg 0.333333 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 30; `ORC-VDDDZ3WF37` |  |
| 443.1 | peritectic: L+MgHg↔MgHg2 | L: Hg 0.812; MgHg: Hg 0.5; MgHg2: Hg 0.667 | model | [1] Feng 2009 | Table 6, p. 5, row 31; `ORC-IYAXSRICZC` |  |
| 443 | peritectic: L+MgHg↔MgHg2 | L: Hg 0.8066; MgHg: Hg 0.5; MgHg2: Hg 0.6667 | experimental | [1] Feng 2009; _cites ref. 26_ | Table 6, p. 5, row 29; `ORC-U7OSW7H37B` |  |
| 442 | peritectic: L+MgHg↔MgHg2 | L: Hg 0.806; MgHg: Hg 0.5; MgHg2: Hg 0.6667 | experimental | [1] Feng 2009; _cites ref. 24_ | Table 6, p. 5, row 28; `ORC-66X75IHLCR` |  |
| 234 | eutectic: L↔Hg+MgHg2 | L: Hg 0.999; Hg: Hg 1; MgHg2: Hg 0.667 | model | [1] Feng 2009 | Table 6, p. 5, row 34; `ORC-AOVBCLQYGM` |  |
| 232 | eutectic: L↔Hg+MgHg2 | Hg: Hg 1; MgHg2: Hg 0.6667 | experimental | [1] Feng 2009; _cites ref. 24_ | Table 6, p. 5, row 32; `ORC-3KSINSPVIE` |  |
| 232 | eutectic: L↔Hg+MgHg2 | MgHg2: Hg 0.666667, Mg 0.333333 | model | [1] Feng 2009; _cites ref. 27_ | Table 6, p. 5, row 33; `ORC-XS25MPVC2E` |  |

## Sources

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

1. Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009). [doi:10.1007/s11771-009-0005-7](https://doi.org/10.1007/s11771-009-0005-7)

## 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/).