Ga–O system

17 accepted literature values from 1 paper(s) (experimental 10, model 7); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (11) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	10
model	7

Accepted values by property group
Property group	Values
phase transition	1
formation	5
heat capacity / entropy / enthalpy	3
crystal structure	8

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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
GaO-04Zin.tdb	M. Zinkevich, F. Aldinger, J. Am. Ceram. Soc., 87, 683-91(2004). doi:10.1111/j.1551-2916.2004.00683.x	`3fb8f43e1c88636a34c486a4181654f98dd2443815e2431740bbcf723444c1d2`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
GaO-04Zin.tdb	302.91	ION (x(O) 0) + ORTHORHOMBIC_A11 (x(O) 0) + GA2O3_BETA (x(O) 0.6)

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, Ga–O system (5)
Phase	Value	T (K)	Class	Source	Location
α-Ga2O3	-1092 kJ/mol (basis unstated) ± 2	298.15	experimental	[1] Zinkevich 2004 cites Reznitskii 1979	Table VI, p. 6, row 4 report
α-Ga2O3	-1084 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Zinkevich 2004 cites Klemm 1936	Table VI, p. 6, row 2 report
α-Ga2O3	-1082 kJ/mol (basis unstated) ± 2	298.15	experimental	[1] Zinkevich 2004 cites Mah 1962	Table VI, p. 6, row 3 report
α-Ga2O3	-1080.4 kJ/mol (basis unstated)		model	[1] Zinkevich 2004	Table VI, p. 6, row 5 report
α-Ga2O3	-1070 kJ/mol (basis unstated) ± 4	298.15	experimental	[1] Zinkevich 2004 cites Roth 1932 doi	Table VI, p. 6, row 1 report

Other properties

Phase transition (1)

Phase transition, Ga–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1800 K	1800	other	model	[1] Zinkevich 2004	p. 7 report	At low pressures, the oxygen solubility in liquid gallium is greatly decreased, whereas ␤-Ga2O3 sublimates at ⬃1800 K (Fig. 5).

Heat capacity / entropy / enthalpy (3)

Heat capacity / entropy / enthalpy, Ga–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: S	85 J/mol (basis unstated)/K ± 0.4	298.15	β-Ga2O3 alloy: O 0.6	experimental	[1] Zinkevich 2004 cites Pankratz 1963	Table V, p. 6, row 2 report
Entropy printed: S	84.6 J/mol (basis unstated)/K ± 0.4	298.15	β-Ga2O3 alloy: O 0.6	experimental	[1] Zinkevich 2004 cites King 1958	Table V, p. 6, row 1 report
Entropy printed: S	84.83 J/mol (basis unstated)/K	298.15	β-Ga2O3 alloy: O 0.6	model	[1] Zinkevich 2004	Table V, p. 6, row 3 report

Crystal structure (8)

Crystal structure, Ga–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	12.214 Å ± 0.003		β-Ga2O3 β-Ga2O3: Ga 0.4, O 0.6	model	[1] Zinkevich 2004 cites Ahman 1996	Table I, p. 2, row 2 report
Lattice a	4.9791 Å ± 6.000e-4	298.15	α-Ga2O3† α-Ga2O3†: Ga 0.4, O 0.6	experimental	[1] Zinkevich 2004 cites Prewitt 1969	Table I, p. 2, row 1 report
Lattice a	8.22 Å	298.15	γ-Ga2O3† γ-Ga2O3†: Ga 0.4, O 0.6	experimental	[1] Zinkevich 2004 cites Pohl 1968	Table I, p. 2, row 3 report
Lattice a	10 Å	298.15	δ-Ga2O3† δ-Ga2O3†: Ga 0.4, O 0.6	experimental	[1] Zinkevich 2004 cites Roy 1952	Table I, p. 2, row 4 report
Lattice b	3.0371 Å ± 9.000e-4		β-Ga2O3 β-Ga2O3: Ga 0.4, O 0.6	model	[1] Zinkevich 2004 cites Ahman 1996	Table I, p. 2, row 2 report
Lattice c	5.7981 Å ± 9.000e-4		β-Ga2O3 β-Ga2O3: Ga 0.4, O 0.6	model	[1] Zinkevich 2004 cites Ahman 1996	Table I, p. 2, row 2 report
Lattice c	13.437 Å ± 0.004	298.15	α-Ga2O3† α-Ga2O3†: Ga 0.4, O 0.6	experimental	[1] Zinkevich 2004 cites Prewitt 1969	Table I, p. 2, row 1 report
lattice beta	103.83 deg ± 0.02		β-Ga2O3 β-Ga2O3: Ga 0.4, O 0.6	model	[1] Zinkevich 2004 cites Ahman 1996	Table I, p. 2, row 2 report

Sources

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

Matvei Zinkevich, Fritz Aldinger, Thermodynamic Assessment of the Gallium‐Oxygen System, Journal of the American Ceramic Society 87, 683-691 (2004). doi:10.1111/j.1551-2916.2004.00683.x

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-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi: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). 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); 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.

@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}
}