Ga–P system

10 accepted literature values from 1 paper(s) (model 6, unspecified 4); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
model	6
unspecified	4

Accepted values by property group
Property group	Values
formation	4
heat capacity / entropy / enthalpy	6

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
GaP-94Ans-LB.tdb	I. Ansara, C. Chatillon, H.L. Lukas, T. Nishizawa, H. Ohtani, K. Ishida, M. Hillert, B. Sundman, B.B. Argent, A. Watson, T.G. Chart, T. Anderson, Calphad, 18, 177-222(1994). doi:10.1016/0364-5916(94)90027-2	`392a70d39e558f6244091074b57c71e145fe2237670b28f9ee772788d8ab59af`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
GaP-94Ans-LB.tdb	1657.43	LIQUID (x(P) 0.23038) + ZINCBLENDE_B3 (x(P) 0.5) + GAS (x(P) 0.99939)
GaP-94Ans-LB.tdb	704.7	ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1)
GaP-94Ans-LB.tdb	302.91	ORTHORHOMBIC_A11 (x(P) 0) + LIQUID (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5)

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–P system (4)
Phase	Value	T (K)	Class	Source	Location
GaP	-129.9 kJ/mol (basis unstated)	298.15	model	[1] Onderka 2002 cites Kaufman 1981	Table AI, p. 19, row 9 report
GaP	-114.6 kJ/mol (basis unstated)	298.15	model	[1] Onderka 2002 cites Ansara 1994	Table AI, p. 19, row 10 report
GaP	-102.1 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Wagman 1968	Table AI, p. 19, row 11 report
GaP	-99.6 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Ilegems 1974	Table AI, p. 19, row 12 report

Other properties

Heat capacity / entropy / enthalpy (6)

Heat capacity / entropy / enthalpy, Ga–P system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: S°298	51.4 J/mol-formula K	298.15	GaP	unspecified	[1] Onderka 2002 cites Koshchenko 1984	Table AI, p. 19, row 13 report
Entropy printed: S°298	50.6 J/mol-formula K	298.15	GaP	unspecified	[1] Onderka 2002 cites Ilegems 1974	Table AI, p. 19, row 12 report
Entropy printed: S°298	51.46 J/mol-formula K	298.15	GaP	model	[1] Onderka 2002 cites Ansara 1994	Table AI, p. 19, row 10 report
Heat capacity printed: Cp,298	43.84 J/mol (basis unstated)/K	298.15	GaP	model	[1] Onderka 2002 cites Ansara 1994	Table AI, p. 19, row 10 report
sm fusion printed: ΔmS	67.49 J/mol-formula K	1749	GaP alloy: Ga 0.5, P 0.5	model	[1] Onderka 2002 cites Ansara 1994	Table AI, p. 19, row 10 report
sm fusion printed: ΔmS	66.1 J/mol-formula K	1760	GaP alloy: Ga 0.5, P 0.5	model	[1] Onderka 2002 cites Kaufman 1981	Table AI, p. 19, row 9 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

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}
}