Ga–N system

23 accepted literature values from 2 paper(s) (experimental 4, model 2, unspecified 17); 2 calculated phase diagram(s). 4 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (5) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	4
model	2
unspecified	17

Accepted values by property group
Property group	Values
phase transition	4
formation	8
heat capacity / entropy / enthalpy	11

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
GaN-03Unl.tdb	J. Unland, B. Onderka, A. Davydov, R. Schmid-Fetzer, J. Cryst. Growth, 256, 33-51(2003). doi:10.1016/S0022-0248(03)01352-6	`eb023f7ceb4ad845c783c44fc3241e37e257661ace881cd9ac75f7bf8666187a`	viewer · TDB · JSON
GaN-98Dav.tdb	A.V. Davydov, T.J. Anderson, Electrochem. Soc. Proc. 98-18, 38-49(1998).	`879d60b9d25803c8732ebeef5da64d4598900a0604a8b9ffa51df68f2d52f070`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
GaN-03Unl.tdb	1117.53	LIQUID (x(N) 0) + GAN_B4 (x(N) 0.5) + GAS (x(N) 1)
GaN-03Unl.tdb	302.91	LIQUID (x(N) 0) + ORTHORHOMBIC_A11 (x(N) 0) + GAN_B4 (x(N) 0.5)
GaN-98Dav.tdb	1052.57	LIQUID (x(N) 0) + GAN_B4 (x(N) 0.5) + GAS (x(N) 1)
GaN-98Dav.tdb	302.91	LIQUID (x(N) 0) + ORTHORHOMBIC_A11 (x(N) 0) + GAN_B4 (x(N) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull GaN-98Dav

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–N system (8)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
GaN		-157.7 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Madar 1975	Table AI, p. 18, row 25 report
GaN		-157.7 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Karpinski 1984	Table AI, p. 18, row 26 report
GaN		-156.8 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Ranade 2000	Table AI, p. 18, row 27 report
GaN		-140.2 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites MacChesney 1970	Table AI, p. 18, row 30 report
GaN		-140 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Unland	Table AI, p. 18, row 17 report
GaN		-117.1 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Davydov 1999	Table AI, p. 18, row 18 report
GaN		-104.2 kJ/mol (basis unstated)	298.15	unspecified			[1] Onderka 2002 cites Hahn 1940	Table AI, p. 18, row 24 report
GaN	GaN	-52.1 kJ/mol-atom ± 2	298.15	experimental	-63.373 (mp-aaaaabey)	-55.891 (oqmd-6450)	[2] Unland 2003 cites Hahn 1940 doi	Table 2, p. 3, row 1 report

Other properties

Phase transition (4)

Phase transition, Ga–N system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1043 K	1043	other: GaN, Dynamic oscillation TGA, first heating cycle alloy: N 0.5	experimental	[2] Unland 2003	Table 4, p. 5, row 1 report
Phase transition	1085 K	1085	other: GaN, fast heating TGA (in ramp before 1275 K, 24 h) alloy: N 0.5	experimental	[2] Unland 2003	Table 4, p. 5, row 2 report
Phase transition	1110 K	1110	other: GaN (+ in situ Ga) Isothermal stepping TGA, samples #1, #2, #3, assessed value alloy: N 0.5	experimental	[2] Unland 2003	Table 4, p. 5, row 4 report
Phase transition	2700 K	2700	liquid	model	[2] Unland 2003	p. 15 report	The experimental solubility data are compared to the calculated phase boundary based on Tm=2700 K in Fig. 8.

Heat capacity / entropy / enthalpy (11)

Heat capacity / entropy / enthalpy, Ga–N system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: S°298	26 J/mol-formula K	298.15	GaN	unspecified	[1] Onderka 2002 cites Unland	Table AI, p. 18, row 17 report
Entropy printed: S°298	37 J/mol-formula K	298.15	GaN	unspecified	[1] Onderka 2002 cites Davydov 1999	Table AI, p. 18, row 29 report
Entropy printed: S°298	36.5 J/mol-formula K	298.15	GaN	unspecified	[1] Onderka 2002 cites Koshenko 1979	Table AI, p. 18, row 28 report
Entropy printed: ΔmS	67.4 J/mol-formula K	298.15	GaN	model	[1] Onderka 2002 cites Jones 1984	Table AI, p. 18, row 19 report
Entropy printed: ΔmS	67.4 J/mol-formula K	2700	GaN	unspecified	[1] Onderka 2002 cites Unland	Table AI, p. 18, row 17 report
Entropy printed: ΔmS	67 J/mol-formula K	2791	GaN	unspecified	[1] Onderka 2002 cites Van 1973	Table AI, p. 18, row 15 report
Entropy printed: ΔmS	31.5 J/mol-formula K	2792	GaN	unspecified	[1] Onderka 2002 cites Davydov 1999	Table AI, p. 18, row 18 report
Heat capacity printed: Cp,298	34.03 J/mol (basis unstated)/K	298.15	GaN	unspecified	[1] Onderka 2002 cites Unland	Table AI, p. 18, row 17 report
Heat capacity printed: Cp,298	33.8 J/mol (basis unstated)/K	298.15	GaN	unspecified	[1] Onderka 2002 cites Strelchenko 1984	Table AI, p. 18, row 23 report
Heat capacity printed: Cp,298	37.86 J/mol (basis unstated)/K	298.15	GaN	unspecified	[1] Onderka 2002 cites Marina 1971	Table AI, p. 18, row 21 report
Heat capacity printed: Cp,298	35.19 J/mol (basis unstated)/K	298.15	GaN	unspecified	[1] Onderka 2002 cites Demidenko 1975	Table AI, p. 18, row 22 report

Sources

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

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
J. Unland, B. Onderka, A. Davydov, R. Schmid-Fetzer, Thermodynamics and Phase Stability in the Ga–N System, Journal of Crystal Growth 256, 33-51 (2003). doi:10.1016/s0022-0248(03)01352-6

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}
}