# Al–P system

> Al–P system: 58 accepted literature values (formation 28, heat capacity / entropy / enthalpy 13, invariant reaction 13, crystal structure 4) and 5 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

58 accepted literature values from 4 paper(s) (experimental 16, model 40, unspecified 2); 5 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/AL-P.json) · [CSV](https://data.orchid-project.org/systems/AL-P.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AL-P) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AL-P/AlP-01Luk-LB.json) · [phases (8)](https://data.orchid-project.org/phases/pages/AL-P.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AL-P.html) · [Markdown](https://data.orchid-project.org/systems/AL-P.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 16 |
| model | 40 |
| unspecified | 2 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 13 |
| formation | 28 |
| heat capacity / entropy / enthalpy | 13 |
| crystal structure | 4 |

## 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 |
|---|---|---|---|
| AlP-01Luk-LB.tdb | H.L. Lukas, unpublished work, 2001. | `a09b97ae195a387d892c7216e39ccc8b8ce12a679f390dfa55d3176c3a12eede` | [viewer](https://orchid-project.org/phase-diagrams/#AL-P/AlP-01Luk-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlP-01Luk-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlP-01Luk-LB.json) |
| AlP-09Tu.tdb | H. Tu, F. Yin, X. Su, Y. Liu, X. Wang, Calphad, 33, 755-60(2009). [doi:10.1016/j.calphad.2009.10.003](https://doi.org/10.1016/j.calphad.2009.10.003) | `428ecee7707707411dc00802ee76de8ab04ebefe799e21669ee4452459f7456d` | [viewer](https://orchid-project.org/phase-diagrams/#AL-P/AlP-09Tu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlP-09Tu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlP-09Tu.json) |
| AlP-13Lia.tdb | S.-M. Liang, R. Schmid-Fetzer, Calphad, 42, 76-85(2013). [doi:10.1016/j.calphad.2013.07.001](https://doi.org/10.1016/j.calphad.2013.07.001) | `157414bde801d14304f611507ca7e0bdca926f66fc5fba14e89e19f6c709b380` | [viewer](https://orchid-project.org/phase-diagrams/#AL-P/AlP-13Lia.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlP-13Lia.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlP-13Lia.json) |
| AlP-15Mie.tdb | J. Miettinen, S. Louhenkilpi, G. Vassilev, J. Phase Equilib. Diffus., 36, 317-26(2015). [doi:10.1007/s11669-015-0383-5](https://doi.org/10.1007/s11669-015-0383-5) | `9261b56f7a7779137b0cfad657c3303d8a7856ad4447088f55792f49a0b30512` | [viewer](https://orchid-project.org/phase-diagrams/#AL-P/AlP-15Mie.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlP-15Mie.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlP-15Mie.json) |
| AlP-94Ans.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](https://doi.org/10.1016/0364-5916%2894%2990027-2) | `0d5a3a8dbc0b4487112babedf399a11ca141d2af338fd664069d3152eee13bab` | [viewer](https://orchid-project.org/phase-diagrams/#AL-P/AlP-94Ans.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlP-94Ans.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlP-94Ans.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| AlP-01Luk-LB.tdb | 2378.76 | LIQUID (x(P) 0.02429) + ZINCBLENDE_B3 (x(P) 0.5) + GAS (x(P) 0.94577) |
| AlP-01Luk-LB.tdb | 933.47 | FCC_A1 (x(P) 0) + LIQUID (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-01Luk-LB.tdb | 933.17 | FCC_A1 (x(P) 0) + LIQUID (x(P) 4.500e-4) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-01Luk-LB.tdb | 704.7 | ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1) |
| AlP-09Tu.tdb | 2244.39 | LIQUID (x(P) 0.03352) + ZINCBLENDE_B3 (x(P) 0.5) + GAS (x(P) 0.97909) |
| AlP-09Tu.tdb | 933.47 | FCC_A1 (x(P) 0) + LIQUID (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-09Tu.tdb | 933.47 | LIQUID (x(P) 0) + FCC_A1 (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-09Tu.tdb | 704.7 | ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1) |
| AlP-13Lia.tdb | 2232.04 | LIQUID (x(P) 0.08288) + ZINCBLENDE_B3 (x(P) 0.5) + GAS (x(P) 0.98199) |
| AlP-13Lia.tdb | 933.47 | FCC_A1 (x(P) 0) + LIQUID (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-13Lia.tdb | 933.45 | FCC_A1 (x(P) 0) + LIQUID (x(P) 3.000e-5) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-13Lia.tdb | 704.7 | ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1) |
| AlP-15Mie.tdb | 2331.7 | LIQUID (x(P) 0.10095) + ZINCBLENDE_B3 (x(P) 0.5) + GAS (x(P) 0.96426) |
| AlP-15Mie.tdb | 933.46 | FCC_A1 (x(P) 0) + LIQUID (x(P) 1.000e-5) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-15Mie.tdb | 933.46 | FCC_A1 (x(P) 0) + LIQUID (x(P) 1.000e-5) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-15Mie.tdb | 704.7 | ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1) |
| AlP-94Ans.tdb | 933.47 | FCC_A1 (x(P) 0) + LIQUID (x(P) 0) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-94Ans.tdb | 932.9 | FCC_A1 (x(P) 0) + LIQUID (x(P) 8.400e-4) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-94Ans.tdb | 932.9 | FCC_A1 (x(P) 0) + LIQUID (x(P) 8.400e-4) + ZINCBLENDE_B3 (x(P) 0.5) |
| AlP-94Ans.tdb | 704.7 | ZINCBLENDE_B3 (x(P) 0.5) + RED_P (x(P) 1) + GAS (x(P) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/AL/AL-P.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/AL/AL-P.json) · [CALPHAD hull AlP-01Luk-LB](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-P--AlP-01Luk-LB.json) · [CALPHAD hull AlP-09Tu](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-P--AlP-09Tu.json) · [CALPHAD hull AlP-13Lia](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-P--AlP-13Lia.json) · [CALPHAD hull AlP-94Ans](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-P--AlP-94Ans.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Al–P system (13)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2830.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013; _cites Ansara 1994_ [doi](https://doi.org/10.1016/0364-5916%2894%2990027-2) | Table 5, p. 5, row 4; `ORC-3G4HATQRXB` |  |
| 2823.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013; _cites Kaufman 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990020-1) | Table 5, p. 5, row 5; `ORC-KLIYDSZFQA` |  |
| 2803.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 5, row 3; `ORC-PIEDI5VLTB` |  |
| 2803.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | experimental | [1] Liang 2013; _cites Kischio 1965_ [doi](https://doi.org/10.1016/0022-1902%2865%2980287-1) | Table 5, p. 5, row 7; `ORC-RR46ZKJY3K` |  |
| 2802.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013; _cites McAlister 2013_ | Table 5, p. 5, row 6; `ORC-44TJ2QWCDZ` |  |
| 2795.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013 | Table 5, p. 5, row 1; `ORC-BSRJ3RZ4PN` |  |
| 2784.15 | congruent melting: L = AlP Congruent melting (P > 300 bar) | L: Al 0.5, P 0.5; AlP: Al 0.5, P 0.5 | model | [1] Liang 2013; _cites Wu 2012_ [doi](https://doi.org/10.1016/j.calphad.2012.03.005) | Table 5, p. 5, row 2; `ORC-4RUC5M7V7R` |  |
| 933.55 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013; _cites McAlister 2013_ | Table 5, p. 5, row 13; `ORC-4J524VVLIH` |  |
| 933.45 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013; _cites Wu 2012_ [doi](https://doi.org/10.1016/j.calphad.2012.03.005) | Table 5, p. 5, row 9; `ORC-75VWY55S7E` |  |
| 933.45 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013 | Table 5, p. 5, row 8; `ORC-QZKWPAVPCZ` |  |
| 933.45 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 5, row 10; `ORC-WAIVFO6DCY` |  |
| 932.85 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013; _cites Ansara 1994_ [doi](https://doi.org/10.1016/0364-5916%2894%2990027-2) | Table 5, p. 5, row 11; `ORC-ZXJMQJEUWV` |  |
| 930.95 | eutectic: L=(Al)+AlP eutectic | AlP: Al 0.5, P 0.5 (basis unresolved) | model | [1] Liang 2013; _cites Kaufman 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990020-1) | Table 5, p. 5, row 12; `ORC-WAYAKZX4RT` |  |

## 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–P system (28)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| AlP |  | -166.5 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [2] Onderka 2002; _cites Wagman 1968_ | Table AI, p. 19, row 7; `ORC-3P2UCAWWEI` |  |
| AlP |  | -164.5 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Onderka 2002; _cites Kaufman 1981_ | Table AI, p. 19, row 8; `ORC-RWG4CSVSSQ` |  |
| AlP |  | -148.6 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Onderka 2002; _cites Ansara 1994_ | Table AI, p. 19, row 6; `ORC-5256XVKBSM.cd4a24` |  |
| AlP |  | -91.5 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites Kaufman 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990020-1) | Table 3, p. 3, row 5; `ORC-6W2764KCGG.3beb49` |  |
| AlP |  | -90.2 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Miettinen 2015; _cites Peviak 1974_ | Table 4, p. 6, row 8; `ORC-C2MP6ECWTH` |  |
| AlP |  | -90.2 per mol-atom ± 4 | 298.15 | experimental |  |  | [1] Liang 2013; _cites Peviak 1974_ | Table 3, p. 3, row 4; `ORC-SKLXQ5SK5Y` |  |
| AlP |  | -82.6 per mol-atom ± 1 | 298.15 | experimental |  |  | [1] Liang 2013; _cites Kischio 1965_ [doi](https://doi.org/10.1016/0022-1902%2865%2980287-1) | Table 3, p. 3, row 2; `ORC-S4MMRQUPVI` |  |
| AlP |  | -82.6 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Miettinen 2015; _cites Kischio 1965_ [doi](https://doi.org/10.1016/0022-1902%2865%2980287-1) | Table 4, p. 6, row 6; `ORC-Y4GCFEKXA5` |  |
| AlP |  | -82.2 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites Barin 1977_ | Table 3, p. 3, row 12; `ORC-IFG25P7NFF.6d560f` |  |
| AlP |  | -82.2 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites Wu 2012_ [doi](https://doi.org/10.1016/j.calphad.2012.03.005) | Table 3, p. 3, row 9; `ORC-T4A3VZGQC2.8fce70` |  |
| AlP |  | -81.8 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Miettinen 2015 | Table 4, p. 6, row 4; `ORC-GX4RQ2FGJ3` |  |
| AlP |  | -81.6 per mol-atom ± 1 | 298.15 | experimental |  |  | [1] Liang 2013; _cites Martosudirdjo 1974_ [doi](https://doi.org/10.1016/0040-6031%2874%2985019-7) | Table 3, p. 3, row 3; `ORC-HQMUO6H5DT` |  |
| AlP |  | -81.6 per mol-atom | 298.15 | model |  |  | [1] Liang 2013 | Table 3, p. 3, row 14; `ORC-QPXL563LZK.7eed37` |  |
| AlP |  | -81.6 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Miettinen 2015; _cites Martosudirdjo 1974_ [doi](https://doi.org/10.1016/0040-6031%2874%2985019-7) | Table 4, p. 6, row 7; `ORC-SJ7BY3I35U` |  |
| AlP |  | -81.6 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Miettinen 2015; _cites Liang 2013_ [doi](https://doi.org/10.1016/j.calphad.2013.07.001) | Table 4, p. 6, row 3; `ORC-WOS5MKXV6V` |  |
| AlP |  | -80.4 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites McAlister 2013_ | Table 3, p. 3, row 6; `ORC-EODCGTI733.17bd76` |  |
| AlP |  | -74.3 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites Ansara 1994_ [doi](https://doi.org/10.1016/0364-5916%2894%2990027-2) | Table 3, p. 3, row 7; `ORC-K2UELGMSEL.b80bd7` |  |
| AlP |  | -74.3 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Miettinen 2015; _cites Ansara 1994_ [doi](https://doi.org/10.1016/0364-5916%2894%2990027-2) | Table 4, p. 6, row 1; `ORC-VD2LVU46DJ` |  |
| AlP |  | -69.4 per mol-atom ± 4 | 298.15 | experimental |  |  | [1] Liang 2013; _cites Wang 1963_ [doi](https://doi.org/10.1016/0022-1902%2863%2980071-8) | Table 3, p. 3, row 1; `ORC-IVQQNZDCYK` |  |
| AlP |  | -69.4 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Miettinen 2015; _cites Wang 1963_ [doi](https://doi.org/10.1016/0022-1902%2863%2980071-8) | Table 4, p. 6, row 5; `ORC-YACG6AQ43C` |  |
| AlP |  | -67.7 per mol-atom ± 6.7 | 298.15 | model |  |  | [1] Liang 2013; _cites De 1968_ | Table 3, p. 3, row 13; `ORC-W2YWDUUAFL` |  |
| AlP |  | -51 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Miettinen 2015; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 4, p. 6, row 2; `ORC-7JEA2OET6I` |  |
| AlP |  | -51 per mol-atom | 298.15 | model |  |  | [1] Liang 2013; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 3, p. 3, row 8; `ORC-7TTMWV5LU3.62f04c` |  |
| AlP | [AlP](https://data.orchid-project.org/compounds/AlP.html) | -41.3 kJ/mol-atom ± 0.55 | 298.15 | experimental | -58.834 (mp-aaaaachq) | -71.088 (oqmd-4641) | [4] Tu 2009; _cites Kischio 1965_ [doi](https://doi.org/10.1016/0022-1902%2865%2980287-1) | Table 3, p. 4, row 2; `ORC-A3TK3RSOWQ` |  |
| AlP | [AlP](https://data.orchid-project.org/compounds/AlP.html) | -34.77 kJ/mol-atom ± 2.3 | 298.15 | experimental | -58.834 (mp-aaaaachq) | -71.088 (oqmd-4641) | [4] Tu 2009; _cites Wang 1963_ [doi](https://doi.org/10.1016/0022-1902%2863%2980071-8) | Table 3, p. 4, row 1; `ORC-AMM5CYBKX7` |  |
| AlP | [AlP](https://data.orchid-project.org/compounds/AlP.html) | -29.5 kJ/mol-atom ± 3.35 | 298.15 | experimental | -58.834 (mp-aaaaachq) | -71.088 (oqmd-4641) | [4] Tu 2009; _cites G 1968_ | Table 3, p. 4, row 3; `ORC-VSKJCGX4YM` |  |
| AlP | [AlP](https://data.orchid-project.org/compounds/AlP.html) | -28.8 kJ/mol-atom ± 8.85 | 298.15 | experimental | -58.834 (mp-aaaaachq) | -71.088 (oqmd-4641) | [4] Tu 2009; _cites Martosudirdjo 1974_ [doi](https://doi.org/10.1016/0040-6031%2874%2985019-7) | Table 3, p. 4, row 4; `ORC-BVWDFFOBII` |  |
| AlP | [AlP](https://data.orchid-project.org/compounds/AlP.html) | -25.5 kJ/mol-atom | 298.15 | model | -58.834 (mp-aaaaachq) | -71.088 (oqmd-4641) | [4] Tu 2009 | Table 3, p. 4, row 5; `ORC-HN6OKJZHTO` |  |

## Other properties

### Heat capacity / entropy / enthalpy (13)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S°298_ | 175.32 J/mol-formula K | 298.15 | AlP | model | [2] Onderka 2002; _cites Ansara 1994_ | Table AI, p. 19, row 6; `ORC-5256XVKBSM.48382f` |  |
| Entropy; _printed: S°298(AlP)_ | 22.9 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Kaufman 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990020-1) | Table 3, p. 3, row 5; `ORC-6W2764KCGG.953ef8` |  |
| Entropy; _printed: S°298(AlP)_ | 25.2 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Terpilowski 1982_ | Table 3, p. 3, row 10; `ORC-6ZQYKQQ4YL` |  |
| Entropy; _printed: S°298(AlP)_ | 28.7 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 3, p. 3, row 8; `ORC-7TTMWV5LU3.9596c3` |  |
| Entropy; _printed: S°298(AlP)_ | 23.6 per mol-atom ± 1.3 | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Sharifov 1966_ | Table 3, p. 3, row 11; `ORC-DGLQS7QFTG` |  |
| Entropy; _printed: S°298(AlP)_ | 18 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites McAlister 2013_ | Table 3, p. 3, row 6; `ORC-EODCGTI733.a66cd6` |  |
| Entropy; _printed: S°298(AlP)_ | 23.6 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Barin 1977_ | Table 3, p. 3, row 12; `ORC-IFG25P7NFF.61d05d` |  |
| Entropy; _printed: S°298(AlP)_ | 87.7 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Ansara 1994_ [doi](https://doi.org/10.1016/0364-5916%2894%2990027-2) | Table 3, p. 3, row 7; `ORC-K2UELGMSEL.866ddb` |  |
| Entropy; _printed: S°298(AlP)_ | 20.2 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013 | Table 3, p. 3, row 14; `ORC-QPXL563LZK.585996` |  |
| Entropy; _printed: S°298(AlP)_ | 23.6 per mol-atom | 298.15 | AlP; _alloy: P 0.5_ | model | [1] Liang 2013; _cites Wu 2012_ [doi](https://doi.org/10.1016/j.calphad.2012.03.005) | Table 3, p. 3, row 9; `ORC-T4A3VZGQC2.2d049e` |  |
| Heat capacity; _printed: Cp,298_ | 49.15 J/mol (basis unstated)/K | 298.15 | AlP | model | [2] Onderka 2002; _cites Ansara 1994_ | Table AI, p. 19, row 6; `ORC-5256XVKBSM.3fce97` |  |
| sm fusion; _printed: ΔmS_ | 61.66 J/mol-formula K | 2824 | AlP; _alloy: Al 0.5, P 0.5_ | model | [2] Onderka 2002; _cites Kaufman 1981_ | Table AI, p. 19, row 5; `ORC-OLOTHSW7JQ` |  |
| sm fusion; _printed: ΔmS_ | 104.16 J/mol-formula K | 2827 | AlP; _alloy: Al 0.5, P 0.5_ | model | [2] Onderka 2002; _cites Ansara 1994_ | Table AI, p. 19, row 6; `ORC-5256XVKBSM.6adcd8` |  |

### Crystal structure (4)

Table: Crystal structure, Al–P system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 4.049 Å | 298.15 | (Al); _alloy: P 0_ | unspecified | [1] Liang 2013; _cites Villars 1985_ | Table 1, p. 2, row 1; `ORC-DV6KZWRX65` |  |
| Lattice a | 546.4 not_printed ± 0.2 | 298.15 | AlP; _alloy: P 0.5_ | experimental | [1] Liang 2013; _cites Kischio 1965_ [doi](https://doi.org/10.1016/0022-1902%2865%2980287-1) | Table 1, p. 2, row 7; `ORC-2SNPXGI7X2` |  |
| Lattice a | 544.8 not_printed ± 0.3 | 298.15 | AlP; _alloy: P 0.5_ | experimental | [1] Liang 2013; _cites White 1944_ [doi](https://doi.org/10.1021/ja01238a018) | Table 1, p. 2, row 6; `ORC-IWQISUQL56` |  |
| Lattice a | 546.7 not_printed ± 0.2 | 298.15 | AlP; _alloy: P 0.5_ | experimental | [1] Liang 2013; _cites Wang 1963_ [doi](https://doi.org/10.1016/0022-1902%2863%2980071-8) | Table 1, p. 2, row 8; `ORC-ZYQEQ5HTC3` |  |

## Sources

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

1. Song-Mao Liang, Rainer Schmid-Fetzer, Thermodynamic assessment of the Al–P system based on original experimental data, Calphad 42, 76-85 (2013). [doi:10.1016/j.calphad.2013.07.001](https://doi.org/10.1016/j.calphad.2013.07.001)
2. 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)
3. Jyrki Miettinen, Seppo Louhenkilpi, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 9: Fe-Al-P, J. Phase Equilib. Diffus. 36, 317-326 (2015). [doi:10.1007/s11669-015-0383-5](https://doi.org/10.1007/s11669-015-0383-5)
4. Hao Tu, Fucheng Yin, Xuping Su, Ya Liu, Xinming Wang, Experimental investigation and thermodynamic modeling of the Al–P–Zn ternary system, Calphad 33, 755-760 (2009). [doi:10.1016/j.calphad.2009.10.003](https://doi.org/10.1016/j.calphad.2009.10.003)

## 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/).