# Hf–Mn system

> Hf–Mn system: 43 accepted literature values (crystal structure 20, phase transition 12, invariant reaction 10, phase equilibrium 1) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/HF-MN.html · Markdown: https://data.orchid-project.org/systems/HF-MN.md

43 accepted literature values from 2 paper(s) (experimental 14, model 12, unspecified 17); 2 calculated phase diagram(s). 22 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/HF-MN.json) · [CSV](https://data.orchid-project.org/systems/HF-MN.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#HF-MN) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#HF-MN/HfMn-12Zho.json) · [phases (9)](https://data.orchid-project.org/phases/pages/HF-MN.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/HF-MN.html) · [Markdown](https://data.orchid-project.org/systems/HF-MN.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 14 |
| model | 12 |
| unspecified | 17 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 10 |
| phase transition | 12 |
| phase equilibrium | 1 |
| crystal structure | 20 |

## 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 |
|---|---|---|---|
| HfMn-12Zho.tdb | P. Zhou, S. Liu, P. Wang, H. Xu, Y. Peng, X. Yuan, Y. Du, J. Zhang, W. Huang, J. Phase Equilib. Diffus., 33, 20-28(2012). [doi:10.1007/s11669-011-9976-9](https://doi.org/10.1007/s11669-011-9976-9) | `13bc2c3266d585e0795f1cb07275ad60b1fa8c1bd349e103547672c826b36065` | [viewer](https://orchid-project.org/phase-diagrams/#HF-MN/HfMn-12Zho.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfMn-12Zho.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfMn-12Zho.json) |
| HfMn-24Bro.tdb | P. Broz, X. Yan, V. Romaka, O. Fabrichnaya, M.J. Kriegel, V. Bursikova, J. Bursik, J. Vrestal, G. Rogl, H. Michor, E. Bauer, M. Eiberger, A. Grytsiv, G. Giester, P.F. Rogl, J. Alloys Compd., 976, 173060(2024). [doi:10.1016/j.jallcom.2023.173060](https://doi.org/10.1016/j.jallcom.2023.173060) | `bd5d0eb030cc8487ff192e89a933f6786eb34f71d853d2cabe123b3cae5573a1` | [viewer](https://orchid-project.org/phase-diagrams/#HF-MN/HfMn-24Bro.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfMn-24Bro.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfMn-24Bro.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| HfMn-12Zho.tdb | 1716.15 | HCP_A3 (x(Mn) 0.02181) + BCC_A2 (x(Mn) 0.08479) + LIQUID (x(Mn) 0.20797) |
| HfMn-12Zho.tdb | 1570.7 | LIQUID (x(Mn) 0.26998) + HFMN (x(Mn) 0.5) + HFMN2_C14 (x(Mn) 0.62856) |
| HfMn-12Zho.tdb | 1524.15 | HCP_A3 (x(Mn) 0.04269) + LIQUID (x(Mn) 0.24791) + HFMN (x(Mn) 0.5) |
| HfMn-12Zho.tdb | 1524.15 | HCP_A3 (x(Mn) 0.04271) + LIQUID (x(Mn) 0.24793) + HFMN (x(Mn) 0.5) |
| HfMn-12Zho.tdb | 1481.02 | HFMN2_C14 (x(Mn) 0.74567) + LIQUID (x(Mn) 0.9677) + BCC_A2 (x(Mn) 0.98464) |
| HfMn-12Zho.tdb | 1411.49 | HFMN2_C14 (x(Mn) 0.75378) + CUB_A13 (x(Mn) 0.98186) + BCC_A2 (x(Mn) 0.98822) |
| HfMn-12Zho.tdb | 1389.46 | CUB_A13 (x(Mn) 0.99579) + BCC_A2 (x(Mn) 0.99734) + FCC_A1 (x(Mn) 0.99979) |
| HfMn-12Zho.tdb | 973.28 | HFMN2_C14 (x(Mn) 0.74371) + CUB_A13 (x(Mn) 0.9981) + CBCC_A12 (x(Mn) 1) |
| HfMn-24Bro.tdb | 1713.95 | HCP_A3 (x(Mn) 0.0249) + BCC_A2 (x(Mn) 0.08907) + LIQUID (x(Mn) 0.18644) |
| HfMn-24Bro.tdb | 1576.07 | HCP_A3 (x(Mn) 0.0435) + LIQUID (x(Mn) 0.21371) + C14_LAVES (x(Mn) 0.63086) |
| HfMn-24Bro.tdb | 1490.13 | C14_LAVES (x(Mn) 0.7439) + LIQUID (x(Mn) 0.97914) + BCC_A2 (x(Mn) 0.9924) |
| HfMn-24Bro.tdb | 1398.79 | C14_LAVES (x(Mn) 0.7451) + CUB_A13 (x(Mn) 0.99233) + BCC_A2 (x(Mn) 0.99604) |
| HfMn-24Bro.tdb | 1391.97 | CUB_A13 (x(Mn) 0.99562) + BCC_A2 (x(Mn) 0.99777) + FCC_A1 (x(Mn) 0.99993) |
| HfMn-24Bro.tdb | 986.08 | C14_LAVES (x(Mn) 0.7329) + CBCC_A12 (x(Mn) 0.99817) + CUB_A13 (x(Mn) 0.99984) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/HF/HF-MN.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/HF/HF-MN.json) · [CALPHAD hull HfMn-12Zho](https://data.orchid-project.org/hulls/calphad-sgte/HF/HF-MN--HfMn-12Zho.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Hf–Mn system (10)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1715.74 | βHf -> L + αHf | βHf: Mn 0.0849; L: Mn 0.2185; αHf: Mn 0.0218 | model | [1] Zhou 2012 | Table 5, p. 8, row 1; `ORC-YQ4PJOLPP3` |  |
| 1573 | L + HfMn2 -> HfMn | L: Mn 0.24; HfMn2: Mn 0.62; HfMn: Mn 0.5 | model | [1] Zhou 2012; _cites Okamoto 1995_ [doi](https://doi.org/10.1007/bf02645298) | Table 5, p. 8, row 4; `ORC-7DQMJ54RYZ` |  |
| 1571.6 | L + HfMn2 -> HfMn | L: Mn 0.2703; HfMn2: Mn 0.6286; HfMn: Mn 0.5 | model | [1] Zhou 2012 | Table 5, p. 8, row 3; `ORC-TYKFLAJBTI` |  |
| 1524.1 | eutectic: L -> αHf + HfMn | L: Mn 0.2479; αHf: Mn 0.0427; HfMn: Mn 0.5 | model | [1] Zhou 2012 | Table 5, p. 8, row 2; `ORC-D6OP22YHT4` |  |
| 1485 | eutectic: L -> HfMn2 + δMn | L: Mn 0.96; HfMn2: Mn 0.755; δMn: Mn 0.992 | model | [1] Zhou 2012; _cites Okamoto 1995_ [doi](https://doi.org/10.1007/bf02645298) | Table 5, p. 8, row 8; `ORC-5HPG54XP3L` |  |
| 1481.01 | eutectic: L -> HfMn2 + δMn | L: Mn 0.9677; HfMn2: Mn 0.7456; δMn: Mn 0.9846 | model | [1] Zhou 2012 | Table 5, p. 8, row 7; `ORC-THZX45RUZU` |  |
| 1413 | HfMn2 + δMn -> βMn | HfMn2: Mn 0.755; δMn: Mn 0.994; βMn: Mn 0.97 | model | [1] Zhou 2012; _cites Okamoto 1995_ [doi](https://doi.org/10.1007/bf02645298) | Table 5, p. 8, row 10; `ORC-LXR46TTYT2` |  |
| 1411.48 | HfMn2 + δMn -> βMn | HfMn2: Mn 0.7537; δMn: Mn 0.9882; βMn: Mn 0.9819 | model | [1] Zhou 2012 | Table 5, p. 8, row 9; `ORC-3HLYU5CEBC` |  |
| 973.27 | βMn -> αMn + HfMn2 | βMn: Mn 0.998; αMn: Mn 1; HfMn2: Mn 0.7437 | model | [1] Zhou 2012 | Table 5, p. 8, row 13; `ORC-VYKG2H2IFE` |  |
| 973 | βMn -> αMn + HfMn2 | βMn: Mn 0.995; αMn: Mn 0.998; HfMn2: Mn 0.74 | model | [1] Zhou 2012; _cites Okamoto 1995_ [doi](https://doi.org/10.1007/bf02645298) | Table 5, p. 8, row 14; `ORC-GPJBIVZVEC` |  |

## Other properties

### Phase transition (12)

Table: Phase transition, Hf–Mn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1041.25 K | 1041.25 | eutectoid: Hf–Mn 6–94 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 11; `ORC-WLJXUOGSVF` |  |
| Phase transition | 1041.55 K | 1041.55 | eutectoid: Hf–Mn 4–96 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 8; `ORC-X77J3YHYXB` |  |
| Phase transition | 1045.65 K | 1045.65 | eutectoid: Hf–Mn 2–98 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 4; `ORC-BBPV3NIBVC` |  |
| Phase transition | 1412.35 K | 1412.35 | peritectoid: Hf–Mn 6–94 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 12; `ORC-SIIPB27ZYL` |  |
| Phase transition | 1413.25 K | 1413.25 | peritectoid: Hf–Mn 4–96 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 9; `ORC-MQU4TP5KMR` |  |
| Phase transition | 1413.35 K | 1413.35 | peritectoid: Hf–Mn 2–98 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 5; `ORC-6PNGMAJCB6` |  |
| Phase transition | 1465.85 K | 1465.85 | eutectic: Hf–Mn 2–98 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 6; `ORC-ZJJTHDB7IN` |  |
| Phase transition | 1466.55 K | 1466.55 | eutectic: Hf–Mn 4–96 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 10; `ORC-EEUBRC6BLD` |  |
| Phase transition | 1466.55 K | 1466.55 | eutectic: Hf–Mn 6–94 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 13; `ORC-ZBNIEWEWJX` |  |
| Phase transition | 1486.55 K | 1486.55 | other: Hf–Mn 2–98 | experimental | [2] Brož 2024 | Table 4b, p. 10, row 7; `ORC-K5724PZQQW` |  |
| Phase transition | 2000.16 K | 2000.16 | L -> HfMn2; _L: Mn 0.6667; HfMn2: Mn 0.6667_ | model | [1] Zhou 2012 | Table 5, p. 8, row 5; `ORC-7IKYX74OER` |  |
| Phase transition | 2003 K | 2003 | L -> HfMn2; _L: Mn 0.667; HfMn2: Mn 0.667_ | model | [1] Zhou 2012; _cites Okamoto 1995_ [doi](https://doi.org/10.1007/bf02645298) | Table 5, p. 8, row 6; `ORC-BUTXONE4MI` |  |

### Phase equilibrium (1)

Table: Phase equilibrium, Hf–Mn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 1486.55 | other: 2–98; _liquid: Hf 0.016, Mn 0.984_ | experimental | [2] Brož 2024 | Table 4b, p. 10, row 1; `ORC-3KJCNBMBQI` |  |

### Crystal structure (20)

Table: Crystal structure, Hf–Mn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 11.886 Å | 298.15 | Hf2Mn; _alloy: Mn 0.333333_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 3; `ORC-V33BHSQR5J` |  |
| Lattice a | 11.7935 Å | 298.15 | Hf3+xMn3-xOy | unspecified | [2] Brož 2024 | Table 1, p. 3, row 5; `ORC-CGJRN47RVD` |  |
| Lattice a | 11.812 Å | 298.15 | HfMn; _alloy: Mn 0.5_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 4; `ORC-Y6X76HSUFA` |  |
| Lattice a | 5.01242 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 10; `ORC-24CLTWBNZR.16377e` |  |
| Lattice a | 4.956 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 8; `ORC-7PZWQQAQ35.339a42` |  |
| Lattice a | 4.96 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 7; `ORC-BEF5EZPIVV.2fbafc` |  |
| Lattice a | 4.9464 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 9; `ORC-KRGOBA7JPX.ec4f75` |  |
| Lattice a | 5.016 Å | 298.15 | βHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 11; `ORC-ZCCHNB7Q37.ba3518` |  |
| Lattice a | 0.49849 not_printed ± 2.000e-5 | 300 | HfMn2; _alloy: Hf 0.339, Mn 0.661_ | experimental | [2] Brož 2024 | Table 2, p. 4, row 1; `ORC-EY55RW5MJB.5b2ec5` |  |
| Lattice a | 5.007 Å | 1730 (\<) | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 6; `ORC-7D3LKG2P63.a03134` |  |
| Lattice a | 3.1949 Å | 1743 (\<) | (αHf); _alloy: Mn 0_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 1; `ORC-GEOY6RH5TL` |  |
| Lattice a | 3.615 Å | 1987 | (βHf); _alloy: Mn 0_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 2; `ORC-SA47A4S3NM` |  |
| Lattice b | 0.49849 not_printed ± 2.000e-5 | 300 | HfMn2; _alloy: Hf 0.339, Mn 0.661_ | experimental | [2] Brož 2024 | Table 2, p. 4, row 1; `ORC-EY55RW5MJB.05b428` |  |
| Lattice c | 8.23508 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 10; `ORC-24CLTWBNZR.308f7f` |  |
| Lattice c | 8.122 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 8; `ORC-7PZWQQAQ35.d126a3` |  |
| Lattice c | 8.147 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 7; `ORC-BEF5EZPIVV.a33a5b` |  |
| Lattice c | 8.0964 Å | 298.15 | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 9; `ORC-KRGOBA7JPX.8decd6` |  |
| Lattice c | 16.367 Å | 298.15 | βHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 11; `ORC-ZCCHNB7Q37.0dc36b` |  |
| Lattice c | 0.81987 not_printed ± 2.000e-5 | 300 | HfMn2; _alloy: Hf 0.339, Mn 0.661_ | experimental | [2] Brož 2024 | Table 2, p. 4, row 1; `ORC-EY55RW5MJB.7fbfcd` |  |
| Lattice c | 8.236 Å | 1730 (\<) | αHfMn2; _alloy: Mn 0.666667_ | unspecified | [2] Brož 2024 | Table 1, p. 3, row 6; `ORC-7D3LKG2P63.a3af44` |  |

## Sources

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

1. Peng Zhou, Shuhong Liu, Peisheng Wang, Honghui Xu, Yingbiao Peng, Xiaoming Yuan et al., Experimental Investigation and Thermodynamic Assessment of the Hf-Mn System, J. Phase Equilib. Diffus. 33, 20-28 (2012). [doi:10.1007/s11669-011-9976-9](https://doi.org/10.1007/s11669-011-9976-9)
2. Pavel Brož, Xinlin Yan, Vitaliy Romaka, Olga Fabrichnaya, Mario J. Kriegel, Vilma Buršíková et al., Constitution, physical properties and thermodynamic modeling of the Hf-Mn system, Journal of Alloys and Compounds 976, 173060 (2024). [doi:10.1016/j.jallcom.2023.173060](https://doi.org/10.1016/j.jallcom.2023.173060)

## 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/).