H–Mg system

18 accepted literature values from 1 paper(s) (experimental 14, model 4); 0 calculated phase diagram(s). 13 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (6) · papers (bibliography) · Markdown

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

Accepted values by property group
Property group	Values
invariant reaction	11
mixing / partial	7

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull MgH-99Zen

Invariant reactions (literature)

Invariant reactions reported in the literature for the H–Mg system (11)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
922.8	L <-> (Mg)+gas	(Mg): H 7.200e-4	model	[1] Zeng 1999	Table 5, p. 9, row 1 report
922.6	L <-> (Mg)+gas	(Mg): H 6.400e-4	experimental	[1] Zeng 1999 cites ref. 7	Table 5, p. 9, row 2 report
834	(Mg)+gas <-> MgH2	(Mg): H 0.093; MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 10	Table 5, p. 9, row 11 report
832	(Mg)+gas <-> MgH2	(Mg): H 0.00806; MgH2: H 0.666667	model	[1] Zeng 1999	Table 5, p. 9, row 10 report
700	(Mg)+gas <-> MgH2	(Mg): H 0.00169; MgH2: H 0.666667	model	[1] Zeng 1999	Table 5, p. 9, row 8 report
700	(Mg)+gas <-> MgH2	MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 10	Table 5, p. 9, row 9 report
590	(Mg)+gas <-> MgH2	MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 29	Table 5, p. 9, row 5 report
575	(Mg)+gas <-> MgH2	MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 21	Table 5, p. 9, row 6 report
573	(Mg)+gas <-> MgH2	MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 19	Table 5, p. 9, row 7 report
561	(Mg)+gas <-> MgH2	(Mg): H 1.900e-4; MgH2: H 0.666667	experimental	[1] Zeng 1999 cites ref. 7	Table 5, p. 9, row 4 report
560.7	(Mg)+gas <-> MgH2	(Mg): H 1.600e-4; MgH2: H 0.666667	model	[1] Zeng 1999	Table 5, p. 9, row 3 report

Other properties

Mixing / partial (7)

Mixing / partial, H–Mg system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Partial enthalpy printed: ΔH°	21.06 kJ/mol-H	668	cph	experimental	[1] Zeng 1999 cites ref. 24	Table 0, p. 4, row 1 report
Partial enthalpy printed: ΔH°	58 unknown ± 5	723	cph	experimental	[1] Zeng 1999 cites ref. 20	Table 0, p. 4, row 4 report
Partial enthalpy printed: ΔH°	51.76 unknown ± 16.63	773	cph	experimental	[1] Zeng 1999 cites ref. 10	Table 0, p. 4, row 5 report
Partial enthalpy printed: ΔH°	24.4 unknown ± 1.2	776	cph	experimental	[1] Zeng 1999 cites ref. 25	Table 0, p. 4, row 3 report
Partial enthalpy printed: ΔH°	20 unknown ± 0.4	796.5	cph	experimental	[1] Zeng 1999 cites ref. 8	Table 0, p. 4, row 2 report
Partial enthalpy printed: ΔH°	25.16 kJ/mol-H	976	Liquid	experimental	[1] Zeng 1999 cites ref. 24	Table 0, p. 4, row 6 report
Partial enthalpy printed: ΔH°	16.7 unknown ± 0.3	978.5	Liquid	experimental	[1] Zeng 1999 cites ref. 8	Table 0, p. 4, row 7 report

Sources

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

K Zeng, Critical assessment and thermodynamic modeling of the Mg–H system, International Journal of Hydrogen Energy 24, 989-1004 (1999). doi:10.1016/s0360-3199(98)00132-3

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}
}