As–Ga system

70 accepted literature values from 4 paper(s) (experimental 59, model 9, unspecified 2); 0 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

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

Accepted values by evidence class
Evidence class	Values
experimental	59
model	9
unspecified	2

Accepted values by property group
Property group	Values
phase transition	44
formation	17
heat capacity / entropy / enthalpy	9

Convex hulls: Materials Project DFT hull · OQMD DFT hull

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, As–Ga system (17)
Phase	Value	T (K)	Class	Source	Location
Ga0.5As0.5(c)	-53.12 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 21	Table II, p. 4, row 9 report
Ga0.5As0.5(c)	-48.55 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 23	Table II, p. 4, row 12 report
Ga0.5As0.5(c)	-47.1 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 20	Table II, p. 4, row 7 report
Ga0.5As0.5(c)	-46.22 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 19	Table II, p. 4, row 6 report
Ga0.5As0.5(c)	-46.15 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 22	Table II, p. 4, row 10 report
Ga0.5As0.5(c)	-46.02 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 18	Table II, p. 4, row 5 report
Ga0.5As0.5(c)	-46.02 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 21	Table II, p. 4, row 8 report
Ga0.5As0.5(c)	-45.22 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 22	Table II, p. 4, row 11 report
Ga0.5As0.5(c)	-43.85 kJ/mol (basis unstated) ± 2	298.15	experimental	[1] Ansara 1984 cites ref. 16	Table II, p. 4, row 3 report
Ga0.5As0.5(c)	-39.75 kJ/mol (basis unstated) ± 1.7	298.15	experimental	[1] Ansara 1984 cites ref. 17	Table II, p. 4, row 4 report
Ga0.5As0.5(c)	-39.68 kJ/mol (basis unstated) ± 0.6	298.15	experimental	[1] Ansara 1984 cites ref. 14	Table II, p. 4, row 1 report
Ga0.5As0.5(c)	-39.32 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Ansara 1984 cites ref. 15	Table II, p. 4, row 2 report
Ga0.5As0.5(s)	-44.4256 kJ/mol (basis unstated)	298.15	model	[2] Chatillon 1990	Table 4, p. 11, row 4 report
GaAs	-105.3 kJ/mol (basis unstated)	298.15	model	[3] Onderka 2002 cites Yamaguchi 1996	Table AI, p. 18, row 52 report
GaAs	-88.8 kJ/mol (basis unstated)	298.15	model	[3] Onderka 2002 cites Ansara 1994	Table AI, p. 18, row 51 report
GaAs	-86.3 kJ/mol (basis unstated)	298.15	model	[3] Onderka 2002 cites Kaufman 1981	Table AI, p. 18, row 50 report
GaAs	-71.1 kJ/mol (basis unstated)	298.15	unspecified	[3] Onderka 2002 cites Wagman 1968	Table AI, p. 18, row 53 report

Other properties

Phase transition (44)

Phase transition, As–Ga system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	960 K	960	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 9 report
Phase transition	964 K	964	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 24 report
Phase transition	965 K	965	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 23 report
Phase transition	965 K	965	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 10 report
Phase transition	981 K	981	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 26 report
Phase transition	981 K	981	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 25 report
Phase transition	1000 K	1000	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 11 report
Phase transition	1003 K	1003	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 12 report
Phase transition	1009 K	1009	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 28 report
Phase transition	1009 K	1009	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 27 report
Phase transition	1023 K	1023	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 30 report
Phase transition	1024 K	1024	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 29 report
Phase transition	1026 K	1026	other: Ankri (6)	experimental	[1] Ansara 1984 cites ref. 6	Table I, p. 3, row 1 report
Phase transition	1028 K	1028	other: Ankri (6)	experimental	[1] Ansara 1984	Table I, p. 3, row 2 report
Phase transition	1034 K	1034	other: Ankri (6)	experimental	[1] Ansara 1984 cites ref. 6	Table I, p. 3, row 3 report
Phase transition	1037 K	1037	other: Ankri (6)	experimental	[1] Ansara 1984	Table I, p. 3, row 4 report
Phase transition	1049 K	1049	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 32 report
Phase transition	1050 K	1050	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 13 report
Phase transition	1051 K	1051	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 31 report
Phase transition	1052 K	1052	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 14 report
Phase transition	1071 K	1071	other: Ankri (6)	experimental	[1] Ansara 1984 cites ref. 6	Table I, p. 3, row 5 report
Phase transition	1073 K	1073	other: Ankri (6)	experimental	[1] Ansara 1984 cites ref. 6	Table I, p. 3, row 7 report
Phase transition	1073 K	1073	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 34 report
Phase transition	1073 K	1073	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 15 report
Phase transition	1074 K	1074	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 36 report
Phase transition	1074 K	1074	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 16 report
Phase transition	1075 K	1075	other: Ankri (6)	experimental	[1] Ansara 1984	Table I, p. 3, row 6 report
Phase transition	1075 K	1075	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 33 report
Phase transition	1076 K	1076	other: Ankri (6)	experimental	[1] Ansara 1984	Table I, p. 3, row 8 report
Phase transition	1077 K	1077	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 35 report
Phase transition	1100 K	1100	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 17 report
Phase transition	1101 K	1101	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 38 report
Phase transition	1101 K	1101	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 37 report
Phase transition	1101 K	1101	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 18 report
Phase transition	1125 K	1125	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 40 report
Phase transition	1126 K	1126	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 39 report
Phase transition	1150 K	1150	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 19 report
Phase transition	1152 K	1152	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 20 report
Phase transition	1172 K	1172	other: Dutartre (8)	experimental	[1] Ansara 1984	Table I, p. 3, row 42 report
Phase transition	1173 K	1173	other: Dutartre (8)	experimental	[1] Ansara 1984 cites ref. 8	Table I, p. 3, row 41 report
Phase transition	1190 K	1190	other: Hsieh (7)	experimental	[1] Ansara 1984 cites ref. 7	Table I, p. 3, row 21 report
Phase transition	1196 K	1196	other: Hsieh (7)	experimental	[1] Ansara 1984	Table I, p. 3, row 22 report
Phase transition	1510 K	1510	congruent transformation	experimental	[4] Ghasemi 2015	p. 1 report	In the As-Ga system, there are three solution phases, liquid, (Ga) and (As) and one stoichiometric phase, GaAs, with zinc-blende structure which melts congruently at 1510 K.
Phase transition	1511 K	1511	GaAs	experimental	[1] Ansara 1984	p. 1 report	Klister and Thoma ( ) using a differential temperature analysis, measured a melting temperature qf 1511 K.

Heat capacity / entropy / enthalpy (9)

Heat capacity / entropy / enthalpy, As–Ga system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: ΔS°298	9.62 kJ/mol°K ± 5	298.15	Ga0.5As0.5(c)	experimental	[1] Ansara 1984 cites ref. 15	Table II, p. 4, row 2 report
Entropy printed: ΔS°298	-19.5 kJ/mol°K ± 4	298.15	Ga0.5As0.5(c)	experimental	[1] Ansara 1984 cites ref. 16	Table II, p. 4, row 3 report
Entropy printed: ΔS°298	-14.31 kJ/mol°K ± 1.7	298.15	Ga0.5As0.5(c)	experimental	[1] Ansara 1984 cites ref. 17	Table II, p. 4, row 4 report
Entropy printed: S°(298.15K)	31.442 J/mol (basis unstated)/K	298.15	Ga0.5As0.5(s) alloy: Ga 0.5	model	[2] Chatillon 1990	Table 4, p. 11, row 4 report
Entropy printed: S°298	62.91 J/mol-formula K	298.15	GaAs	model	[3] Onderka 2002 cites Ansara 1994	Table AI, p. 18, row 51 report
Entropy printed: ΔmS	70.41 J/mol-formula K	1510	GaAs	model	[3] Onderka 2002 cites Ansara 1994	Table AI, p. 18, row 51 report
Entropy printed: ΔmS	70.11 J/mol-formula K	1512	GaAs	model	[3] Onderka 2002 cites Kaufman 1981	Table AI, p. 18, row 50 report
Entropy printed: °S^L - °S^f.c.c.	34.68 J/mol (basis unstated)/K	1513	Ga0.5As0.5 alloy: As 0.5, Ga 0.5	unspecified	[1] Ansara 1984	Table VI, p. 13, row 4 report
Heat capacity printed: Cp,298	46.85 J/mol (basis unstated)/K	298.15	GaAs	model	[3] Onderka 2002 cites Ansara 1994	Table AI, p. 18, row 51 report

Sources

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

I. Ansara, D. Dutartre, Thermodynamic study of the Al-Ga-As-Ge system, Calphad 8, 323-342 (1984). doi:10.1016/0364-5916(84)90035-x
C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Re-assessment of the thermodynamic properties and phase diagrams of the Ga-As and In-As systems, Calphad 14, 203-214 (1990). doi:10.1016/0364-5916(90)90021-q
B. Onderka, J. Unland, R. Schmid-Fetzer, Thermodynamics and phase stability in the In–N system, J. Mater. Res. 17, 3065-3083 (2002). doi:10.1557/jmr.2002.0445
Masoomeh Ghasemi, Jonas Johansson, Thermodynamic assessment of the As–Zn and As–Ga–Zn systems, Journal of Alloys and Compounds 638, 95-102 (2015). doi:10.1016/j.jallcom.2015.03.051

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}
}