Al–P system

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

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	16
model	40
unspecified	2

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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
AlP-01Luk-LB.tdb	H.L. Lukas, unpublished work, 2001.	`a09b97ae195a387d892c7216e39ccc8b8ce12a679f390dfa55d3176c3a12eede`	viewer · TDB · 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	`428ecee7707707411dc00802ee76de8ab04ebefe799e21669ee4452459f7456d`	viewer · TDB · JSON
AlP-13Lia.tdb	S.-M. Liang, R. Schmid-Fetzer, Calphad, 42, 76-85(2013). doi:10.1016/j.calphad.2013.07.001	`157414bde801d14304f611507ca7e0bdca926f66fc5fba14e89e19f6c709b380`	viewer · TDB · 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	`9261b56f7a7779137b0cfad657c3303d8a7856ad4447088f55792f49a0b30512`	viewer · TDB · 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	`0d5a3a8dbc0b4487112babedf399a11ca141d2af338fd664069d3152eee13bab`	viewer · TDB · JSON

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 · OQMD DFT hull · CALPHAD hull AlP-01Luk-LB · CALPHAD hull AlP-09Tu · CALPHAD hull AlP-13Lia · CALPHAD hull AlP-94Ans

Invariant reactions (literature)

Invariant reactions reported in the literature for the Al–P system (13)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
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	Table 5, p. 5, row 4 report
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	Table 5, p. 5, row 5 report
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	Table 5, p. 5, row 3 report
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	Table 5, p. 5, row 7 report
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 report
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 report
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	Table 5, p. 5, row 2 report
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 report
933.45	eutectic: L=(Al)+AlP eutectic	AlP: Al 0.5, P 0.5 (basis unresolved)	model	[1] Liang 2013 cites Wu 2012 doi	Table 5, p. 5, row 9 report
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 report
933.45	eutectic: L=(Al)+AlP eutectic	AlP: Al 0.5, P 0.5 (basis unresolved)	model	[1] Liang 2013 cites Tu 2009 doi	Table 5, p. 5, row 10 report
932.85	eutectic: L=(Al)+AlP eutectic	AlP: Al 0.5, P 0.5 (basis unresolved)	model	[1] Liang 2013 cites Ansara 1994 doi	Table 5, p. 5, row 11 report
930.95	eutectic: L=(Al)+AlP eutectic	AlP: Al 0.5, P 0.5 (basis unresolved)	model	[1] Liang 2013 cites Kaufman 1981 doi	Table 5, p. 5, row 12 report

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–P system (28)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
AlP		-166.5 kJ/mol (basis unstated)	298.15	unspecified			[2] Onderka 2002 cites Wagman 1968	Table AI, p. 19, row 7 report
AlP		-164.5 kJ/mol (basis unstated)	298.15	model			[2] Onderka 2002 cites Kaufman 1981	Table AI, p. 19, row 8 report
AlP		-148.6 kJ/mol (basis unstated)	298.15	model			[2] Onderka 2002 cites Ansara 1994	Table AI, p. 19, row 6 report
AlP		-91.5 per mol-atom	298.15	model			[1] Liang 2013 cites Kaufman 1981 doi	Table 3, p. 3, row 5 report
AlP		-90.2 kJ/mol (basis unstated)	298.15	experimental			[3] Miettinen 2015 cites Peviak 1974	Table 4, p. 6, row 8 report
AlP		-90.2 per mol-atom ± 4	298.15	experimental			[1] Liang 2013 cites Peviak 1974	Table 3, p. 3, row 4 report
AlP		-82.6 per mol-atom ± 1	298.15	experimental			[1] Liang 2013 cites Kischio 1965 doi	Table 3, p. 3, row 2 report
AlP		-82.6 kJ/mol (basis unstated)	298.15	experimental			[3] Miettinen 2015 cites Kischio 1965 doi	Table 4, p. 6, row 6 report
AlP		-82.2 per mol-atom	298.15	model			[1] Liang 2013 cites Barin 1977	Table 3, p. 3, row 12 report
AlP		-82.2 per mol-atom	298.15	model			[1] Liang 2013 cites Wu 2012 doi	Table 3, p. 3, row 9 report
AlP		-81.8 kJ/mol (basis unstated)	298.15	model			[3] Miettinen 2015	Table 4, p. 6, row 4 report
AlP		-81.6 per mol-atom ± 1	298.15	experimental			[1] Liang 2013 cites Martosudirdjo 1974 doi	Table 3, p. 3, row 3 report
AlP		-81.6 per mol-atom	298.15	model			[1] Liang 2013	Table 3, p. 3, row 14 report
AlP		-81.6 kJ/mol (basis unstated)	298.15	experimental			[3] Miettinen 2015 cites Martosudirdjo 1974 doi	Table 4, p. 6, row 7 report
AlP		-81.6 kJ/mol (basis unstated)	298.15	model			[3] Miettinen 2015 cites Liang 2013 doi	Table 4, p. 6, row 3 report
AlP		-80.4 per mol-atom	298.15	model			[1] Liang 2013 cites McAlister 2013	Table 3, p. 3, row 6 report
AlP		-74.3 per mol-atom	298.15	model			[1] Liang 2013 cites Ansara 1994 doi	Table 3, p. 3, row 7 report
AlP		-74.3 kJ/mol (basis unstated)	298.15	model			[3] Miettinen 2015 cites Ansara 1994 doi	Table 4, p. 6, row 1 report
AlP		-69.4 per mol-atom ± 4	298.15	experimental			[1] Liang 2013 cites Wang 1963 doi	Table 3, p. 3, row 1 report
AlP		-69.4 kJ/mol (basis unstated)	298.15	experimental			[3] Miettinen 2015 cites Wang 1963 doi	Table 4, p. 6, row 5 report
AlP		-67.7 per mol-atom ± 6.7	298.15	model			[1] Liang 2013 cites De 1968	Table 3, p. 3, row 13 report
AlP		-51 kJ/mol (basis unstated)	298.15	model			[3] Miettinen 2015 cites Tu 2009 doi	Table 4, p. 6, row 2 report
AlP		-51 per mol-atom	298.15	model			[1] Liang 2013 cites Tu 2009 doi	Table 3, p. 3, row 8 report
AlP	AlP	-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	Table 3, p. 4, row 2 report
AlP	AlP	-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	Table 3, p. 4, row 1 report
AlP	AlP	-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 report
AlP	AlP	-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	Table 3, p. 4, row 4 report
AlP	AlP	-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 report

Other properties

Heat capacity / entropy / enthalpy (13)

Heat capacity / entropy / enthalpy, Al–P system
Property	Value	T (K)	Phases / composition	Class	Source	Location
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 report
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	Table 3, p. 3, row 5 report
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 report
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	Table 3, p. 3, row 8 report
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 report
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 report
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 report
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	Table 3, p. 3, row 7 report
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 report
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	Table 3, p. 3, row 9 report
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 report
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 report
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 report

Crystal structure (4)

Crystal structure, Al–P system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	4.049 Å	298.15	(Al) alloy: P 0	unspecified	[1] Liang 2013 cites Villars 1985	Table 1, p. 2, row 1 report
Lattice a	546.4 not_printed ± 0.2	298.15	AlP alloy: P 0.5	experimental	[1] Liang 2013 cites Kischio 1965 doi	Table 1, p. 2, row 7 report
Lattice a	544.8 not_printed ± 0.3	298.15	AlP alloy: P 0.5	experimental	[1] Liang 2013 cites White 1944 doi	Table 1, p. 2, row 6 report
Lattice a	546.7 not_printed ± 0.2	298.15	AlP alloy: P 0.5	experimental	[1] Liang 2013 cites Wang 1963 doi	Table 1, p. 2, row 8 report

Sources

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

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
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
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
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

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}
}