Eu–Ni system

55 accepted literature values from 1 paper(s) (experimental 18, model 37); 1 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	18
model	37

Accepted values by property group
Property group	Values
invariant reaction	27
formation	19
heat capacity / entropy / enthalpy	9

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
EuNi-16Kar.tdb	S. Kardellass, C. Servant, N. Selhaoui, J. Thermal Anal. Calorim., 125, 255-69(2016). doi:10.1007/s10973-016-5380-3	`921469b7e3cef2ddddb778c160b323be6584d59358b5d6482b057201f326c468`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
EuNi-16Kar.tdb	1557.87	EUNI5_D2D (x(Ni) 0.83333) + LIQUID (x(Ni) 0.91559) + FCC_A1 (x(Ni) 1)
EuNi-16Kar.tdb	1557.87	EUNI5_D2D (x(Ni) 0.83333) + LIQUID (x(Ni) 0.91567) + FCC_A1 (x(Ni) 1)
EuNi-16Kar.tdb	1463.99	EUNI5_D2D (x(Ni) 0.83333) + EU2NI17 (x(Ni) 0.89474) + FCC_A1 (x(Ni) 1)
EuNi-16Kar.tdb	1365.51	LIQUID#2 (x(Ni) 0.13752) + LIQUID (x(Ni) 0.37891) + EUNI (x(Ni) 0.5)
EuNi-16Kar.tdb	1353.33	LIQUID (x(Ni) 0.66392) + EUNI2_C36 (x(Ni) 0.66667) + EUNI5_D2D (x(Ni) 0.83333)
EuNi-16Kar.tdb	1353.32	LIQUID (x(Ni) 0.66365) + EUNI2_C36 (x(Ni) 0.66667) + EUNI5_D2D (x(Ni) 0.83333)
EuNi-16Kar.tdb	1328.66	EUNI (x(Ni) 0.5) + LIQUID (x(Ni) 0.60675) + EUNI2_C36 (x(Ni) 0.66667)
EuNi-16Kar.tdb	1328.66	EUNI (x(Ni) 0.5) + LIQUID (x(Ni) 0.60655) + EUNI2_C36 (x(Ni) 0.66667)
EuNi-16Kar.tdb	1044.97	BCC_A2 (x(Ni) 3.000e-5) + LIQUID (x(Ni) 0.03775) + EUNI (x(Ni) 0.5)
EuNi-16Kar.tdb	1044.97	BCC_A2 (x(Ni) 3.000e-5) + LIQUID (x(Ni) 0.03764) + EUNI (x(Ni) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Eu–Ni system (27)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1993.15	monotectic: Top of the monotectic domain	L: Eu 0.745; Liq: Eu 0.745	model	[1] Kardellass 2016	Table 8, p. 13, row 24 report
1983.15	monotectic: Top of the monotectic domain	L: Eu 0.74; Liq: Eu 0.74	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 23 report
1713.15	congruent melting: Liq -> Ni5Eu	Ni5Eu: Eu 0.166667, Ni 0.833333	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 8 report
1670.15	congruent melting: Liq -> Ni5Eu	L: Eu 0.166; Ni5Eu: Eu 0.166667, Ni 0.833333; Liq: Eu 0.166	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 9 report
1666.15	congruent melting: Liq -> Ni5Eu	Ni5Eu: Eu 0.166667, Ni 0.833333	model	[1] Kardellass 2016	Table 8, p. 13, row 10 report
1593.95	eutectic: Liq -> fcc_A1 + Ni5Eu	L: Eu 0.0827; Ni5Eu: Eu 0.166667, Ni 0.833333; Liq: Eu 0.0827	model	[1] Kardellass 2016	Table 8, p. 13, row 4 report
1589.45	peritectic: Liq + Ni5Eu -> Ni17Eu2	L: Eu 0.0827; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni17Eu2: Eu 0.105263, Ni 0.894737; Liq: Eu 0.0827	model	[1] Kardellass 2016	Table 8, p. 13, row 7 report
1543.15	peritectic: Liq + Ni5Eu -> Ni17Eu2	L: Eu 0.078; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni17Eu2: Eu 0.105263, Ni 0.894737; Liq: Eu 0.078	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 5 report
1543.15	eutectic: Liq -> fcc_A1 + Ni5Eu	L: Eu 0.078; Ni5Eu: Eu 0.166667, Ni 0.833333; Liq: Eu 0.078	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 3 report
1510.15	peritectic: Liq + Ni5Eu -> Ni17Eu2	L: Eu 0.0788; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni17Eu2: Eu 0.105263, Ni 0.894737; Liq: Eu 0.0788	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 6 report
1473.15	eutectic: Liq -> fcc_A1 + Ni5Eu	L: Eu 0.05; Ni5Eu: Eu 0.166667, Ni 0.833333; Liq: Eu 0.05	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 1 report
1473.15	eutectic: Liq -> fcc_A1 + Ni5Eu	L: Eu 0.073; Ni5Eu: Eu 0.166667, Ni 0.833333; Liq: Eu 0.073	model	[1] Kardellass 2016 cites Tung 1989 doi	Table 8, p. 13, row 2 report
1391.75	congruent melting: Liq -> NiEu	L: Eu 0.5; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.5	model	[1] Kardellass 2016	Table 8, p. 13, row 16 report
1371.15	eutectic: Liq1# -> Liq2# + NiEu	Liq1#: Eu 0.6; Liq2#: Eu 0.851; NiEu: Eu 0.5, Ni 0.5	model	[1] Kardellass 2016	Table 8, p. 13, row 22 report
1365.55	eutectic: Liq1# -> Liq2# + NiEu	Liq1#: Eu 0.505; Liq2#: Eu 0.948; NiEu: Eu 0.5, Ni 0.5	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 21 report
1365.55	peritectic: Liq + Ni5Eu -> Ni2Eu	L: Eu 0.347; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni2Eu: Eu 0.333333, Ni 0.666667; Liq: Eu 0.347	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 12 report
1365.55	congruent melting: Liq -> NiEu	L: Eu 0.5; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.5	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 15 report
1365.55	congruent melting: Liq -> NiEu	L: Eu 0.5; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.5	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 14 report
1358.15	peritectic: Liq + Ni5Eu -> Ni2Eu	L: Eu 0.341; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni2Eu: Eu 0.333333, Ni 0.666667; Liq: Eu 0.341	model	[1] Kardellass 2016	Table 8, p. 13, row 13 report
1342.65	peritectic: Liq + Ni5Eu -> Ni2Eu	L: Eu 0.366; Ni5Eu: Eu 0.166667, Ni 0.833333; Ni2Eu: Eu 0.333333, Ni 0.666667; Liq: Eu 0.366	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 11 report
1335.05	eutectic: Ni2Eu + NiEu -> Liq	Ni2Eu: Eu 0.333333, Ni 0.666667; NiEu: Eu 0.5, Ni 0.5; L: Eu 0.41; Liq: Eu 0.41	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 18 report
1330.15	eutectic: Ni2Eu + NiEu -> Liq	Ni2Eu: Eu 0.333333, Ni 0.666667; NiEu: Eu 0.5, Ni 0.5; L: Eu 0.396; Liq: Eu 0.396	model	[1] Kardellass 2016	Table 8, p. 13, row 19 report
1312.15	eutectic: Liq1# -> Liq2# + NiEu	Liq1#: Eu 0.581; Liq2#: Eu 0.934; NiEu: Eu 0.5, Ni 0.5	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 20 report
1281.15	eutectic: Ni2Eu + NiEu -> Liq	Ni2Eu: Eu 0.333333, Ni 0.666667; NiEu: Eu 0.5, Ni 0.5; L: Eu 0.415; Liq: Eu 0.415	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 17 report
1083.15	eutectic: Liq -> NiEu + fcc_A1	L: Eu 0.997; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.997	experimental	[1] Kardellass 2016 cites Savitskii 1967 doi	Table 8, p. 13, row 25 report
1083.15	eutectic: Liq -> NiEu + fcc_A1	L: Eu 0.997; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.997	model	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 8, p. 13, row 26 report
1023.15	eutectic: Liq -> NiEu + fcc_A1	L: Eu 0.954; NiEu: Eu 0.5, Ni 0.5; Liq: Eu 0.954	model	[1] Kardellass 2016	Table 8, p. 13, row 27 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, Eu–Ni system (14)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Ni17Eu2		-48 kJ/mol (basis unstated) ± 4	298.15	experimental			[1] Kardellass 2016 cites Cignini 2003 doi	Table 7, p. 13, row 3 report
Ni17Eu2		-9.9 kJ/mol (basis unstated)	298.15	experimental			[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 2 report
Ni17Eu2	Eu2Ni17	-9 kJ/mol-atom	298.15	model	-6.408 (mp-aaacqixi)	-12.136 (oqmd-30108)	[1] Kardellass 2016	Table 4, p. 7, row 3 report
Ni17Eu2		-9 kJ/mol (basis unstated)		model			[1] Kardellass 2016	Table 7, p. 13, row 1 report
Ni2Eu		-16.36 kJ/mol (basis unstated)		model			[1] Kardellass 2016	Table 7, p. 13, row 6 report
Ni2Eu	EuNi2	-16.36 kJ/mol-atom	298.15	model		-37.69 (oqmd-1591127)	[1] Kardellass 2016	Table 4, p. 7, row 10 report
Ni2Eu		-16.22 kJ/mol (basis unstated)		model			[1] Kardellass 2016	Table 7, p. 13, row 8 report
Ni2Eu		-15.6 kJ/mol (basis unstated)	298.15	experimental			[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 7 report
Ni5Eu		-15.6 kJ/mol (basis unstated)	298.15	experimental			[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 5 report
Ni5Eu	EuNi5	-14.47 kJ/mol-atom	298.15	model	-12.017 (mp-aaaabhad)	-21.135 (oqmd-30109)	[1] Kardellass 2016	Table 4, p. 7, row 6 report
Ni5Eu		-14.47 kJ/mol (basis unstated)		model			[1] Kardellass 2016	Table 7, p. 13, row 4 report
NiEu		-16.22 kJ/mol (basis unstated)		model			[1] Kardellass 2016	Table 7, p. 13, row 8 report
NiEu	EuNi	-16.22 kJ/mol-atom	298.15	model		-30.347 (oqmd-1366256)	[1] Kardellass 2016	Table 4, p. 7, row 14 report
NiEu		-13 kJ/mol (basis unstated)	298.15	experimental			[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 9 report

Other properties

Formation (5)

Formation, Eu–Ni system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy of formation printed: Entropies of formation	2 J/mol (basis unstated)/K ± 0.2	298.15	Ni17Eu2 alloy: Ni 0.894737	experimental	[1] Kardellass 2016 cites Cignini 2003 doi	Table 7, p. 13, row 3 report
Entropy of formation printed: Entropies of formation	-0.1 J/mol (basis unstated)/K	298.15	Ni17Eu2 alloy: Ni 0.894737	experimental	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 2 report
Entropy of formation printed: Entropies of formation	-0.2 J/mol (basis unstated)/K	298.15	Ni2Eu alloy: Ni 0.666667	experimental	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 7 report
Entropy of formation printed: Entropies of formation	-0.1 J/mol (basis unstated)/K	298.15	Ni5Eu alloy: Ni 0.833333	experimental	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 5 report
Entropy of formation printed: Entropies of formation	-2 J/mol (basis unstated)/K	298.15	NiEu alloy: Ni 0.5	experimental	[1] Kardellass 2016 cites Berezutskii 2014 doi	Table 7, p. 13, row 9 report

Heat capacity / entropy / enthalpy (9)

Heat capacity / entropy / enthalpy, Eu–Ni system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: Entropies of formation	37.79 J/mol (basis unstated)/K		Ni17Eu2 alloy: Ni 0.894737	model	[1] Kardellass 2016	Table 7, p. 13, row 1 report
Entropy printed: Entropies of formation	57.74 J/mol (basis unstated)/K		Ni2Eu alloy: Eu 0.333333, Ni 0.666667	model	[1] Kardellass 2016	Table 7, p. 13, row 8 report
Entropy printed: Entropies of formation	49.55 J/mol (basis unstated)/K		Ni2Eu alloy: Ni 0.666667	model	[1] Kardellass 2016	Table 7, p. 13, row 6 report
Entropy printed: Entropies of formation	41.19 J/mol (basis unstated)/K		Ni5Eu alloy: Ni 0.833333	model	[1] Kardellass 2016	Table 7, p. 13, row 4 report
Entropy printed: Entropies of formation	57.74 J/mol (basis unstated)/K		NiEu alloy: Ni 0.5	model	[1] Kardellass 2016	Table 7, p. 13, row 8 report
Entropy printed: Entropies of formation	37.78 J/mol-atom/K	298.15	Ni17Eu2 alloy: Ni 0.894737	model	[1] Kardellass 2016	Table 4, p. 7, row 3 report
Entropy printed: Entropies of formation	49.55 J/mol-atom/K	298.15	Ni2Eu alloy: Ni 0.666667	model	[1] Kardellass 2016	Table 4, p. 7, row 10 report
Entropy printed: Entropies of formation	41.19 J/mol-atom/K	298.15	Ni5Eu alloy: Ni 0.833333	model	[1] Kardellass 2016	Table 4, p. 7, row 6 report
Entropy printed: Entropies of formation	57.74 J/mol-atom/K	298.15	NiEu alloy: Ni 0.5	model	[1] Kardellass 2016	Table 4, p. 7, row 14 report

Sources

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

Saïd Kardellass, Colette Servant, Najim Selhaoui, Thermodynamic description of the Ni–Yb and Ni–Eu binary systems, J Therm Anal Calorim 125, 255-269 (2016). doi:10.1007/s10973-016-5380-3

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}
}