# Al–N system

> Al–N system: 30 accepted literature values (phase equilibrium 14, heat capacity / entropy / enthalpy 8, formation 6, activity / EMF / Gibbs energy 2) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/AL-N.html · Markdown: https://data.orchid-project.org/systems/AL-N.md

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](https://data.orchid-project.org/literature/systems/AL-N.json) · [CSV](https://data.orchid-project.org/systems/AL-N.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AL-N) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AL-N/AlN-12Pav.json) · [phases (9)](https://data.orchid-project.org/phases/pages/AL-N.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AL-N.html) · [Markdown](https://data.orchid-project.org/systems/AL-N.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 14 |
| model | 4 |
| unspecified | 12 |

Table: 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.

Table: 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](https://doi.org/10.1007/s11669-012-0073-5) | `b71f53ed66e8ec4dae915d6808cb8972c35765eda1557bdc582255c517a527af` | [viewer](https://orchid-project.org/phase-diagrams/#AL-N/AlN-12Pav.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlN-12Pav.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlN-12Pav.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](https://doi.org/10.1016/j.calphad.2019.03.008) | `5663a4eb05e34e21198cb8e2afb7cf0810bdce746b744defb9d85f7c26178748` | [viewer](https://orchid-project.org/phase-diagrams/#AL-N/AlN-19Sri.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlN-19Sri.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlN-19Sri.json) |
| AlN-92Hil.tdb | M. Hillert, S. Jonsson, Metall. Trans. A, 23A, 3141-49(1992). [doi:10.1007/BF02646133](https://doi.org/10.1007/BF02646133) | `982fcadf622909c3cfc869ecb8083f5b1ae1d762bcacf992598dea20353d022b` | [viewer](https://orchid-project.org/phase-diagrams/#AL-N/AlN-92Hil.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlN-92Hil.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlN-92Hil.json) |
| AlN-98Luk-LB.tdb | H.L. Lukas, COST 507, Final report round 2, 1998. | `ffaef9c6915723a08427f8eadc9616ac5154589c76d28957b47460a0e9737d7b` | [viewer](https://orchid-project.org/phase-diagrams/#AL-N/AlN-98Luk-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlN-98Luk-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlN-98Luk-LB.json) |

Table: 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](https://data.orchid-project.org/hulls/dft-mp/AL/AL-N.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/AL/AL-N.json) · [CALPHAD hull AlN-12Pav](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-N--AlN-12Pav.json) · [CALPHAD hull AlN-92Hil](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-N--AlN-92Hil.json) · [CALPHAD hull AlN-98Luk-LB](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-N--AlN-98Luk-LB.json)

## 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](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Al–N system (6)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| AlN |  | -318.4 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites Mah 1961_ | Table AI, p. 18, row 7; `ORC-RV7HORYS2S.364abc` |  |
| AlN |  | -317.9 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites Era 1977_ | Table AI, p. 18, row 13; `ORC-SCJ6PTKNQD` |  |
| AlN |  | -316.3 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites Hildebrand 1963_ | Table AI, p. 18, row 12; `ORC-4D3CFBSIUE` |  |
| AlN |  | -313 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites Neugebauer 1957_ | Table AI, p. 18, row 11; `ORC-H3GAN2DCZE` |  |
| AlN |  | -312.5 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites Sato 1932_ | Table AI, p. 18, row 10; `ORC-CGJSSMUS7E` |  |
| AlN |  | -311.1 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Onderka 2002; _cites McHale 1999_ | Table AI, p. 18, row 14; `ORC-LZU5HZK74A` |  |

## Other properties

### Phase equilibrium (14)

Table: Phase equilibrium, Al–N system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| 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; `ORC-2YKHUHSMHQ` |  |
| 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; `ORC-3FSJU2W3H5` |  |
| 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; `ORC-ZVET4JTZ4J` |  |
| 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; `ORC-JHSN2KNOM3` |  |
| 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; `ORC-UH2ZDDWHD2` |  |
| 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; `ORC-36FLNF4JVS` |  |
| 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; `ORC-T3H62NK6L4` |  |
| 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; `ORC-UY62PLEW2D` |  |
| 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; `ORC-62RTZ4D3JK` |  |
| 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; `ORC-MQPR3QGJJT` |  |
| 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; `ORC-6UYJKZKJNF` |  |
| 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; `ORC-ZMEFMBGHFY` |  |
| 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; `ORC-ZBARUE47EY` |  |
| 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; `ORC-463AUQ3OAS` |  |

### Heat capacity / entropy / enthalpy (8)

Table: Heat capacity / entropy / enthalpy, Al–N system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| 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; `ORC-4SUFGCWB5N` |  |
| 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; `ORC-5ZUETBL665` |  |
| 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; `ORC-RV7HORYS2S.c7e276` |  |
| 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; `ORC-TYSHPITKQL.0c1b29` |  |
| Entropy; _printed: ΔmS_ | 69.5 J/mol-formula K | 3487 | AlN | unspecified | [1] Onderka 2002; _cites Van 1973_ | Table AI, p. 18, row 3; `ORC-MMEMZ4U37H` |  |
| 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; `ORC-3J2PIHG6TF` |  |
| 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; `ORC-RV7HORYS2S.78a9c1` |  |
| 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; `ORC-TYSHPITKQL.1204bc` |  |

### Activity / EMF / Gibbs energy (2)

Table: 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; `ORC-KRCDKG5FIO` | “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; `ORC-T2O46GCLCX` | “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).

1. 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](https://doi.org/10.1557/jmr.2002.0445)
2. 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](https://doi.org/10.1007/s11669-012-0073-5)
3. Mats Hillert, Stefan Jonsson, An Assessment of the Al- Fe- N System, Metall Trans A 23, 3141-3149 (1992). [doi:10.1007/bf02646133](https://doi.org/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). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).