Al–N system

30 accepted literature values from 3 paper(s) (experimental 14, model 4, unspecified 12); 4 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 · interactive phase diagram · phases (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	14
model	4
unspecified	12

Accepted values by property group
Property group	Values
phase equilibrium	14
formation	6
heat capacity / entropy / enthalpy	8
activity / EMF / Gibbs energy	2

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
AlN-12Pav.tdb	D. Pavlyuchkov, O. Fabrichnaya, M. Herrmann, H.J. Seifert, J. Phase Equilib. Diffus., 33, 357-68(2012). doi:10.1007/s11669-012-0073-5	`b71f53ed66e8ec4dae915d6808cb8972c35765eda1557bdc582255c517a527af`	viewer · TDB · JSON
AlN-19Sri.tdb	S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019). doi:10.1016/j.calphad.2019.03.008	`5663a4eb05e34e21198cb8e2afb7cf0810bdce746b744defb9d85f7c26178748`	viewer · TDB · JSON
AlN-92Hil.tdb	M. Hillert, S. Jonsson, Metall. Trans. A, 23A, 3141-49(1992). doi:10.1007/BF02646133	`982fcadf622909c3cfc869ecb8083f5b1ae1d762bcacf992598dea20353d022b`	viewer · TDB · JSON
AlN-98Luk-LB.tdb	H.L. Lukas, COST 507, Final report round 2, 1998.	`ffaef9c6915723a08427f8eadc9616ac5154589c76d28957b47460a0e9737d7b`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
AlN-19Sri.tdb	933.34	FCC_A1 (x(N) 5.000e-5) + ION (x(N) 2.400e-4) + ALN_B4 (x(N) 0.5)
AlN-92Hil.tdb	933.5	ION (x(N) 0) + FCC_A1 (x(N) 4.000e-5) + ALN_B4 (x(N) 0.5)
AlN-92Hil.tdb	933.5	LIQUID (x(N) 0) + FCC_A1 (x(N) 4.000e-5) + ALN_B4 (x(N) 0.5)
AlN-98Luk-LB.tdb	933.47	FCC_A1 (x(N) 0) + LIQUID (x(N) 0) + ALN_B4 (x(N) 0.5)
AlN-98Luk-LB.tdb	933.31	FCC_A1 (x(N) 0) + LIQUID (x(N) 2.500e-4) + ALN_B4 (x(N) 0.5)
AlN-98Luk-LB.tdb	933.31	FCC_A1 (x(N) 0) + LIQUID (x(N) 2.500e-4) + ALN_B4 (x(N) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull AlN-12Pav · CALPHAD hull AlN-92Hil · CALPHAD hull AlN-98Luk-LB

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, Al–N system (6)
Phase	Value	T (K)	Class	Source	Location
AlN	-318.4 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Mah 1961	Table AI, p. 18, row 7 report
AlN	-317.9 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Era 1977	Table AI, p. 18, row 13 report
AlN	-316.3 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Hildebrand 1963	Table AI, p. 18, row 12 report
AlN	-313 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Neugebauer 1957	Table AI, p. 18, row 11 report
AlN	-312.5 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites Sato 1932	Table AI, p. 18, row 10 report
AlN	-311.1 kJ/mol (basis unstated)	298.15	unspecified	[1] Onderka 2002 cites McHale 1999	Table AI, p. 18, row 14 report

Other properties

Phase equilibrium (14)

Phase equilibrium, Al–N system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition	660 (>)	molten Al + liquid Al molten Al: Al 0.55, N 0.45; liquid Al: Al 0.55, N 0.45	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 9 report
Phase composition	923.15	molten Al + liquid Al molten Al: Al 1, N 0; liquid Al: Al 1, N 0	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 1 report
Phase composition	963.15	molten Al + liquid Al molten Al: Al 0.73, N 0.27; liquid Al: Al 0.73, N 0.27	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 5 report
Phase composition	973.15	molten Al + liquid Al molten Al: Al 0.73, N 0.27; liquid Al: Al 0.73, N 0.27	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 10 report
Phase composition	1033.15	molten Al + liquid Al molten Al: Al 0.68, N 0.32; liquid Al: Al 0.68, N 0.32	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 6 report
Phase composition	1123.15	molten Al + liquid Al molten Al: Al 0.61, N 0.39; liquid Al: Al 0.61, N 0.39	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 11 report
Phase composition	1173.15	molten Al + liquid Al molten Al: Al 0.56, N 0.44; liquid Al: Al 0.56, N 0.44	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 2 report
Phase composition	1203.15	molten Al + liquid Al molten Al: Al 0.53, N 0.47; liquid Al: Al 0.53, N 0.47	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 8 report
Phase composition	1213.15	molten Al + liquid Al molten Al: Al 0.52, N 0.48; liquid Al: Al 0.52, N 0.48	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 12 report
Phase composition	1223.15	molten Al + liquid Al molten Al: Al 0.51, N 0.49; liquid Al: Al 0.51, N 0.49	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 13 report
Phase composition	1473.15	molten Al + liquid Al molten Al: Al 0.3, N 0.7; liquid Al: Al 0.3, N 0.7	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 3 report
Phase composition	1473.15	molten Al + liquid Al molten Al: Al 0.998, N 0.002; liquid Al: Al 0.998, N 0.002	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 15 report
Phase composition	1673.15	molten Al + liquid Al molten Al: Al 0.12, N 0.88; liquid Al: Al 0.12, N 0.88	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 16 report
Phase composition	1773.15	molten Al + liquid Al molten Al: Al 0.04, N 0.96; liquid Al: Al 0.04, N 0.96	experimental	[2] Pavlyuchkov 2012	Table 4, p. 8, row 4 report

Heat capacity / entropy / enthalpy (8)

Heat capacity / entropy / enthalpy, Al–N system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: ΔmS	63.6 J/mol-formula K	298.15	AlN	model	[1] Onderka 2002 cites Jones 1984	Table AI, p. 18, row 6 report
Entropy printed: ΔmS	66.9 J/mol-formula K	298.15	AlN	model	[1] Onderka 2002 cites Jones 1984	Table AI, p. 18, row 5 report
Entropy printed: S°298	20.1 J/mol-formula K	298.15	AlN	unspecified	[1] Onderka 2002 cites Mah 1961	Table AI, p. 18, row 7 report
Entropy printed: S°298	19.69 J/mol-formula K	298.15	AlN	unspecified	[1] Onderka 2002 cites Koshchenko 1984	Table AI, p. 18, row 8 report
Entropy printed: ΔmS	69.5 J/mol-formula K	3487	AlN	unspecified	[1] Onderka 2002 cites Van 1973	Table AI, p. 18, row 3 report
Heat capacity printed: Cp,298	34.6 J/mol (basis unstated)/K	298.15	AlN	unspecified	[1] Onderka 2002 cites Strelchenko 1984	Table AI, p. 18, row 9 report
Heat capacity printed: Cp,298	30.04 J/mol (basis unstated)/K	298.15	AlN	unspecified	[1] Onderka 2002 cites Mah 1961	Table AI, p. 18, row 7 report
Heat capacity printed: Cp,298	30.25 J/mol (basis unstated)/K	298.15	AlN	unspecified	[1] Onderka 2002 cites Koshchenko 1984	Table AI, p. 18, row 8 report

Activity / EMF / Gibbs energy (2)

Activity / EMF / Gibbs energy, Al–N system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Vapour pressure printed: p	9.75 bar	3067.7		model	[3] Hillert 1992	p. 5 report	The triple point is found at 9.75 bar and 3067.7 K.
Vapour pressure printed: p	9.75 bar	3068		model	[3] Hillert 1992	p. 1 report	The melting point of A1N is taken as 3068 K, and a required gas pressure of 9.75 bar is predicted.

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
D. Pavlyuchkov, O. Fabrichnaya, M. Herrmann, H. J. Seifert, Thermodynamic Assessments of the Al2O3-Al4C3-AlN and Al4C3-AlN-SiC Systems, J. Phase Equilib. Diffus. 33, 357-368 (2012). doi:10.1007/s11669-012-0073-5
Mats Hillert, Stefan Jonsson, An Assessment of the Al- Fe- N System, Metall Trans A 23, 3141-3149 (1992). doi:10.1007/bf02646133

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}
}