Fe–Nb–P system

41 accepted literature values from 2 paper(s) (experimental 12, model 29); 0 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	12
model	29

Accepted values by property group
Property group	Values
invariant reaction	28
crystal structure	13

Invariant reactions (literature)

Invariant reactions reported in the literature for the Fe–Nb–P system (28)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1810.15	quasi-peritectic: L + τ1 = λ + τ2	L: Fe 0.388776, Nb 0.485646, P 0.125578; Liq: Fe 0.388776, Nb 0.485646, P 0.125578	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 16 report
1776.15	L + τ2 = λ + τ3	L: Fe 0.394664, Nb 0.56853, P 0.036805; Liq: Fe 0.394664, Nb 0.56853, P 0.036805	experimental	[1] Miettinen 2015 cites Niessen 1983 doi	Table 4, p. 9, row 19 report
1762.15	eutectic: L = bcc + λ + τ3	L: Fe 0.362711, Nb 0.612137, P 0.025152; Liq: Fe 0.362711, Nb 0.612137, P 0.025152	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 8 report
1760.15	peritectic: L + τ1 + τ2 = τ3	L: Fe 0.189044, Nb 0.59151, P 0.219446; Liq: Fe 0.189044, Nb 0.59151, P 0.219446	model	[1] Miettinen 2015	Table 4, p. 9, row 28 report
1744.15	quasi-peritectic: L + τ1 = λ + τ2	L: Fe 0.422015, Nb 0.446337, P 0.131648; Liq: Fe 0.422015, Nb 0.446337, P 0.131648	model	[1] Miettinen 2015	Table 4, p. 9, row 14 report
1739.15	eutectic: L = λ + τ2 + τ3	L: Fe 0.382519, Nb 0.499844, P 0.117637; Liq: Fe 0.382519, Nb 0.499844, P 0.117637	model	[1] Miettinen 2015	Table 4, p. 9, row 4 report
1726.15	quasi-peritectic: L + μ = λ + τ3	L: Fe 0.403174, Nb 0.51449, P 0.082336; Liq: Fe 0.403174, Nb 0.51449, P 0.082336	model	[1] Miettinen 2015	Table 4, p. 9, row 17 report
1725.15	quasi-peritectic: L + NbP = Nb7P4 + τ1	L: Fe 0.019257, Nb 0.649749, P 0.330995; Liq: Fe 0.019257, Nb 0.649749, P 0.330995	model	[1] Miettinen 2015	Table 4, p. 9, row 21 report
1704.15	eutectic: L = bcc + μ + τ3	L: Fe 0.354938, Nb 0.612438, P 0.032625; Liq: Fe 0.354938, Nb 0.612438, P 0.032625	model	[1] Miettinen 2015	Table 4, p. 9, row 6 report
1683.15	quasi-peritectic: L + τ1 = τ3 + Nb7P4	L: Fe 0.039805, Nb 0.680303, P 0.279892; Liq: Fe 0.039805, Nb 0.680303, P 0.279892	model	[1] Miettinen 2015	Table 4, p. 9, row 20 report
1656.15	eutectic: L = bcc + λ + τ3	L: Fe 0.287935, Nb 0.620597, P 0.091468; Liq: Fe 0.287935, Nb 0.620597, P 0.091468	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 7 report
1655.15	quasi-peritectic: L + τ1 = λ + τ2	L: Fe 0.370748, Nb 0.484232, P 0.14502; Liq: Fe 0.370748, Nb 0.484232, P 0.14502	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 15 report
1646.15	L + λ = μ + τ3	L: Fe 0.331451, Nb 0.548084, P 0.120465; Liq: Fe 0.331451, Nb 0.548084, P 0.120465	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 18 report
1636.15	eutectic: L = λ + τ2 + τ3	L: Fe 0.337405, Nb 0.525604, P 0.136991; Liq: Fe 0.337405, Nb 0.525604, P 0.136991	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 5 report
1600.15	eutectic: L = bcc + Nb7P4 + τ3	L: Fe 0.008389, Nb 0.757183, P 0.234429; Liq: Fe 0.008389, Nb 0.757183, P 0.234429	model	[1] Miettinen 2015	Table 4, p. 9, row 9 report
1568.15	eutectic: L = bcc + λ + τ1	L: Fe 0.83998, Nb 0.093041, P 0.066979; Liq: Fe 0.83998, Nb 0.093041, P 0.066979	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 3 report
1565.15	eutectic: L = bcc + λ + τ1	L: Fe 0.810032, Nb 0.118265, P 0.071703; Liq: Fe 0.810032, Nb 0.118265, P 0.071703	model	[1] Miettinen 2015	Table 4, p. 9, row 1 report
1556.15	eutectic: L = bcc + λ + τ1	L: Fe 0.82368, Nb 0.110442, P 0.065878; Liq: Fe 0.82368, Nb 0.110442, P 0.065878	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 2 report
1548.15	quasi-peritectic: L + Fe2P = FeP + τ1	L: Fe 0.589411, Nb 0.018117, P 0.392472; Liq: Fe 0.589411, Nb 0.018117, P 0.392472	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 24 report
1530.15	eutectic: L = Fe2P + FeP + τ1	L: Fe 0.554961, Nb 0.023898, P 0.421141; Liq: Fe 0.554961, Nb 0.023898, P 0.421141	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 23 report
1478.15	quasi-peritectic: L + Fe2P = FeP + τ1	L: Fe 0.504496, Nb 0.060548, P 0.434957; Liq: Fe 0.504496, Nb 0.060548, P 0.434957	model	[1] Miettinen 2015	Table 4, p. 9, row 22 report
1475.15	eutectic: L = NbP + FeP + τ1	L: Fe 0.461121, Nb 0.084692, P 0.454186; Liq: Fe 0.461121, Nb 0.084692, P 0.454186	model	[1] Miettinen 2015	Table 4, p. 9, row 10 report
1422.15	L + Fe2P = Fe3P + τ1	L: Fe 0.782327, Nb 0.002177, P 0.215496; Liq: Fe 0.782327, Nb 0.002177, P 0.215496	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 26 report
1421.15	quasi-peritectic: L + Fe2P = Fe3P + τ1	L: Fe 0.774167, Nb 0.005443, P 0.22039; Liq: Fe 0.774167, Nb 0.005443, P 0.22039	model	[1] Miettinen 2015	Table 4, p. 9, row 25 report
1398.15	L + Fe2P = Fe3P + τ1	L: Fe 0.75959, Nb 0.005403, P 0.235007; Liq: Fe 0.75959, Nb 0.005403, P 0.235007	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 27 report
1322.15	eutectic: L = bcc + Fe3P + τ1	L: Fe 0.835894, Nb 0.001675, P 0.162432; Liq: Fe 0.835894, Nb 0.001675, P 0.162432	model	[1] Miettinen 2015 cites Tokunaga 2009 doi	Table 4, p. 9, row 12 report
1318.15	eutectic: L = bcc + Fe3P + τ1	L: Fe 0.825654, Nb 0.006707, P 0.167639; Liq: Fe 0.825654, Nb 0.006707, P 0.167639	experimental	[1] Miettinen 2015 cites Vogel 1962 doi	Table 4, p. 9, row 13 report
1316.15	eutectic: L = bcc + Fe3P + τ1	L: Fe 0.829692, Nb 0.004468, P 0.165841; Liq: Fe 0.829692, Nb 0.004468, P 0.165841	model	[1] Miettinen 2015	Table 4, p. 9, row 11 report

Other properties

Crystal structure (13)

Crystal structure, Fe–Nb–P system
Property	Value	Phases / composition	Class	Source	Location
Lattice a	6.13 Å	FeNb4P alloy: Nb 0.666667, P 0.166667	experimental	[2] Tokunaga 2009	Table 1, p. 4, row 18 report
Lattice a	6.16 Å	FeNb4P alloy: Nb 0.666667, P 0.166667	model	[2] Tokunaga 2009	Table 1, p. 4, row 17 report
Lattice a	6.139 Å	FeNbP alloy: Nb 0.333333, P 0.333333	experimental	[2] Tokunaga 2009	Table 1, p. 4, row 16 report
Lattice a	6.347 Å	FeNbP alloy: Nb 0.333333, P 0.333333	model	[2] Tokunaga 2009	Table 1, p. 4, row 15 report
Lattice a	6.578 Å	Nb2P in FeNbP	model	[2] Tokunaga 2009	Table 1, p. 4, row 4 report
Lattice b	3.585 Å	FeNbP alloy: Nb 0.333333, P 0.333333	experimental	[2] Tokunaga 2009	Table 1, p. 4, row 16 report
Lattice b	3.706 Å	FeNbP alloy: Nb 0.333333, P 0.333333	model	[2] Tokunaga 2009	Table 1, p. 4, row 15 report
Lattice b	3.941 Å	Nb2P in FeNbP	model	[2] Tokunaga 2009	Table 1, p. 4, row 4 report
Lattice c	5.006 Å	FeNb4P alloy: Nb 0.666667, P 0.166667	experimental	[2] Tokunaga 2009	Table 1, p. 4, row 18 report
Lattice c	5.03 Å	FeNb4P alloy: Nb 0.666667, P 0.166667	model	[2] Tokunaga 2009	Table 1, p. 4, row 17 report
Lattice c	7.006 Å	FeNbP alloy: Nb 0.333333, P 0.333333	experimental	[2] Tokunaga 2009	Table 1, p. 4, row 16 report
Lattice c	7.243 Å	FeNbP alloy: Nb 0.333333, P 0.333333	model	[2] Tokunaga 2009	Table 1, p. 4, row 15 report
Lattice c	7.552 Å	Nb2P in FeNbP	model	[2] Tokunaga 2009	Table 1, p. 4, row 4 report

Sources

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

Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P systems. Part 5: Fe-Nb-P, J. Phase Equilib. Diffus. 36, 68-77 (2015). doi:10.1007/s11669-014-0351-5
Tatsuya Tokunaga, Naoko Hanaya, Hiroshi Ohtani, Mitsuhiro Hasebe, Thermodynamic Analysis of Phase Equilibria in the Fe–Nb–P Ternary System, ISIJ Int. 49, 947-956 (2009). doi:10.2355/isijinternational.49.947

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 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_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}
}