H–Mn system

22 accepted literature values from 1 paper(s) (experimental 4, model 4, DFT 14); 0 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	4
model	4
DFT	14

Accepted values by property group
Property group	Values
invariant reaction	8
formation	14

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull MnH-11Lob

Invariant reactions (literature)

Invariant reactions reported in the literature for the H–Mn system (8)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1489.15	eutectic: L -> (δMn) + Gas	L: H 0.062; (δMn): H 0.042	experimental	[1] Liang 2018 cites Serdyuk 1982	Table 1, p. 3, row 1 report
1487.15	eutectic: L -> (δMn) + Gas	L: H 0.062; (δMn): H 0.0416	model	[1] Liang 2018	Table 1, p. 3, row 2 report
1418.15	(δMn) + Gas -> (γMn)	(δMn): H 0.0376; (γMn): H 0.0393	model	[1] Liang 2018	Table 1, p. 3, row 4 report
1416.15	(δMn) + Gas -> (γMn)	(δMn): H 0.033; (γMn): H 0.046	experimental	[1] Liang 2018 cites Serdyuk 1982	Table 1, p. 3, row 3 report
1330.15	(γMn) -> (βMn) + Gas	(γMn): H 0.041; (βMn): H 0.034	experimental	[1] Liang 2018 cites Serdyuk 1982	Table 1, p. 3, row 5 report
1328.15	(γMn) -> (βMn) + Gas	(γMn): H 0.0381; (βMn): H 0.0328	model	[1] Liang 2018	Table 1, p. 3, row 6 report
937.15	(βMn) -> (αMn) + ε	(βMn): H 0.0194; (αMn): H 0.0096	model	[1] Liang 2018	Table 1, p. 3, row 8 report
935.15	(βMn) -> (αMn) + ε	(βMn): H 0.028; (αMn): H 0.018	experimental	[1] Liang 2018 cites Serdyuk 1982	Table 1, p. 3, row 7 report

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.

Enthalpies of formation, H–Mn system (14)
Phase	Value	Class	Source	Location
Mn3H	4.88 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 6 report
Mn3H	5.5 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 7 report
Mn3H	48.9181 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 6 report
Mn3H	55.0931 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 7 report
MnH	1.6 kJ/mol-atom	DFT	[1] Liang 2018 cites https://www 2018	Table 2, p. 3, row 3 report
MnH	2.33 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 1 report
MnH	5.58 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 2 report
MnH	16.1131 kJ/mol-atom	DFT	[1] Liang 2018 cites https://www 2018	Table 2, p. 3, row 3 report
MnH	23.3495 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 1 report
MnH	55.865 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 2 report
MnH3	3.48 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 4 report
MnH3	3.62 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 5 report
MnH3	34.8312 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 4 report
MnH3	36.2785 kJ/mol-atom	DFT	[1] Liang 2018 cites http://oqmd 2018	Table 2, p. 3, row 5 report

Sources

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

Yongpeng Liang, Shuhong Liu, Yong Du, Thermodynamic Assessment of the Mn-H and Mg-Mn-H Systems, J. Phase Equilib. Diffus. 39, 186-195 (2018). doi:10.1007/s11669-018-0622-7

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). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi: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). doi: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); 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); 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. 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.

@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_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}
}