Eu–Pd system

42 accepted literature values from 2 paper(s) (experimental 10, model 32); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (11) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	10
model	32

Accepted values by property group
Property group	Values
invariant reaction	16
phase transition	5
formation	20
mixing / partial	1

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
EuPd-01Du-LB.tdb	Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001). doi:10.1016/S0925-8388(01)01411-6	`108635fcb4bb16a26e242ab2423d09ffa5186de2e8e7e6bbf2e7d7bc7505acbf`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
EuPd-01Du-LB.tdb	1602.12	EUPD2_C15 (x(Pd) 0.66667) + LIQUID (x(Pd) 0.68267) + EUPD3_L12 (x(Pd) 0.75)
EuPd-01Du-LB.tdb	1602.12	EUPD2_C15 (x(Pd) 0.66667) + LIQUID (x(Pd) 0.68289) + EUPD3_L12 (x(Pd) 0.75)
EuPd-01Du-LB.tdb	1602.12	EUPD2_C15 (x(Pd) 0.66667) + LIQUID (x(Pd) 0.68267) + EUPD3_L12 (x(Pd) 0.75)
EuPd-01Du-LB.tdb	1377.41	EUPD3_L12 (x(Pd) 0.75) + EUPD5 (x(Pd) 0.83333) + LIQUID (x(Pd) 0.86292)
EuPd-01Du-LB.tdb	1377.41	EUPD3_L12 (x(Pd) 0.75) + EUPD5 (x(Pd) 0.83333) + LIQUID (x(Pd) 0.86291)
EuPd-01Du-LB.tdb	1353.09	EUPD5 (x(Pd) 0.83333) + LIQUID (x(Pd) 0.87135) + FCC_A1 (x(Pd) 0.91066)
EuPd-01Du-LB.tdb	1125.23	LIQUID (x(Pd) 0.49916) + EUPD_B33 (x(Pd) 0.5) + EUPD2_C15 (x(Pd) 0.66667)
EuPd-01Du-LB.tdb	1125.23	LIQUID (x(Pd) 0.49938) + EUPD_B33 (x(Pd) 0.5) + EUPD2_C15 (x(Pd) 0.66667)
EuPd-01Du-LB.tdb	1052.37	EU3PD2 (x(Pd) 0.4) + LIQUID (x(Pd) 0.43884) + EUPD_B33 (x(Pd) 0.5)
EuPd-01Du-LB.tdb	1052.37	EU3PD2 (x(Pd) 0.4) + LIQUID (x(Pd) 0.43875) + EUPD_B33 (x(Pd) 0.5)
EuPd-01Du-LB.tdb	1052.37	EU3PD2 (x(Pd) 0.4) + LIQUID (x(Pd) 0.43895) + EUPD_B33 (x(Pd) 0.5)
EuPd-01Du-LB.tdb	882.9	LIQUID (x(Pd) 0.27847) + EU5PD2 (x(Pd) 0.28571) + EU3PD2 (x(Pd) 0.4)
EuPd-01Du-LB.tdb	882.9	LIQUID (x(Pd) 0.27873) + EU5PD2 (x(Pd) 0.28571) + EU3PD2 (x(Pd) 0.4)
EuPd-01Du-LB.tdb	850.13	EUPD5 (x(Pd) 0.83333) + EUPD7 (x(Pd) 0.875) + FCC_A1 (x(Pd) 0.91845)
EuPd-01Du-LB.tdb	850.13	EUPD5 (x(Pd) 0.83333) + EUPD7 (x(Pd) 0.875) + FCC_A1 (x(Pd) 0.91845)
EuPd-01Du-LB.tdb	850.13	EUPD5 (x(Pd) 0.83333) + EUPD7 (x(Pd) 0.875) + FCC_A1 (x(Pd) 0.91845)
EuPd-01Du-LB.tdb	817.43	BCC_A2 (x(Pd) 0) + LIQUID (x(Pd) 0.18068) + EU5PD2 (x(Pd) 0.28571)
EuPd-01Du-LB.tdb	817.43	BCC_A2 (x(Pd) 0) + LIQUID (x(Pd) 0.18053) + EU5PD2 (x(Pd) 0.28571)
EuPd-01Du-LB.tdb	817.43	BCC_A2 (x(Pd) 0) + LIQUID (x(Pd) 0.1802) + EU5PD2 (x(Pd) 0.28571)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Eu–Pd system (16)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1603	eutectic: liq.->EuPd2+EuPd3	liq.: Pd 0.665; EuPd2: Pd 0.666667; EuPd3: Pd 0.75	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 13 report
1602	eutectic: liq.->EuPd2+EuPd3	liq.: Pd 0.6827; EuPd2: Pd 0.666667; EuPd3: Pd 0.75	model	[1] Du 2001	Table 2, p. 3, row 12 report
1378	liq.+EuPd3->EuPd5	liq.: Pd 0.8629; EuPd3: Pd 0.75; EuPd5: Pd 0.833333	model	[1] Du 2001	Table 2, p. 3, row 16 report
1378	liq.+EuPd3->EuPd5	liq.: Pd 0.865; EuPd3: Pd 0.75; EuPd5: Pd 0.833333	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 17 report
1353	eutectic: liq.->EuPd5+fcc(Pd)	liq.: Pd 0.875; EuPd5: Pd 0.833333; fcc(Pd): Pd 0.905	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 19 report
1353	eutectic: liq.->EuPd5+fcc(Pd)	liq.: Pd 0.8713; EuPd5: Pd 0.833333; fcc(Pd): Pd 0.8907	model	[1] Du 2001	Table 2, p. 3, row 18 report
1128	liq.+EuPd2->EuPd	liq.: Pd 0.495; EuPd2: Pd 0.666667; EuPd: Pd 0.5	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 10 report
1125	liq.+EuPd2->EuPd	liq.: Pd 0.4992; EuPd2: Pd 0.666667; EuPd: Pd 0.5	model	[1] Du 2001	Table 2, p. 3, row 9 report
1052	eutectic: liq.->Eu3Pd2+EuPd	liq.: Pd 0.4388; Eu3Pd2: Pd 0.4; EuPd: Pd 0.5	model	[1] Du 2001	Table 2, p. 3, row 7 report
1048	eutectic: liq.->Eu3Pd2+EuPd	liq.: Pd 0.42; Eu3Pd2: Pd 0.4; EuPd: Pd 0.5	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 8 report
883	liq.+Eu3Pd2->Eu5Pd2	liq.: Pd 0.263; Eu3Pd2: Pd 0.4; Eu5Pd2: Pd 0.285714	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 4 report
883	liq.+Eu3Pd2->Eu5Pd2	liq.: Pd 0.2785; Eu3Pd2: Pd 0.4; Eu5Pd2: Pd 0.285714	model	[1] Du 2001	Table 2, p. 3, row 3 report
850	EuPd5+fcc(Pd)->EuPd7	EuPd5: Pd 0.833333; fcc(Pd): Pd 0.9185; EuPd7: Pd 0.875	model	[1] Du 2001	Table 2, p. 3, row 20 report
850	EuPd5+fcc(Pd)->EuPd7	EuPd5: Pd 0.833333; fcc(Pd): Pd 0.9; EuPd7: Pd 0.875	experimental	[1] Du 2001 cites Takao 1990 doi	Table 2, p. 3, row 21 report
818	eutectic: liq.->bcc(Eu)+Eu5Pd2	liq.: Pd 0.175; bcc(Eu): Pd 0; Eu5Pd2: Pd 0.285714	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 2 report
817	eutectic: liq.->bcc(Eu)+Eu5Pd2	liq.: Pd 0.1805; bcc(Eu): Pd 0; Eu5Pd2: Pd 0.285714	model	[1] Du 2001	Table 2, p. 3, row 1 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–Pd system (7)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Pd2Eu	EuPd2	-104.63 kJ/mol-atom	298.15	model	-69.372 (mp-aaaaacti)	-85.545 (oqmd-30126)	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 61 report
Pd2Eu5	Eu5Pd2	-44.766 kJ/mol-atom	298.15	model	-47.438 (mp-aaackwba)	-59.161 (oqmd-30128)	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 13 report
Pd3Eu	EuPd3	-95.334 kJ/mol-atom	298.15	model	-51.853 (mp-aaabkfgh)	-64.877 (oqmd-30129)	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 3 report
Pd3Eu	EuPd3	-51.176 kJ/mol-atom	298.15	model	-51.853 (mp-aaabkfgh)	-64.877 (oqmd-30129)	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Pd7Eu		-51.176 kJ/mol-atom	298.15	model			[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Pd7RE		-51.176 kJ/mol-atom	298.15	model			[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 6, row 7 report
PdEu	EuPd	-78.545 kJ/mol-atom	298.15	model	-67.611 (mp-aaacfydn)	-83.46 (oqmd-30127)	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 23 report

Other properties

Phase transition (5)

Phase transition, Eu–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	1082 K	1082	liq.->Eu3Pd2 liq.: Pd 0.4; Eu3Pd2: Pd 0.4	model	[1] Du 2001	Table 2, p. 3, row 5 report
Phase transition	1083 K	1083	liq.->Eu3Pd2 liq.: Pd 0.4; Eu3Pd2: Pd 0.4	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 6 report
Phase transition	1607 K	1607	liq.->EuPd2 liq.: Pd 0.6667; EuPd2: Pd 0.666667	model	[1] Du 2001	Table 2, p. 3, row 11 report
Phase transition	1698 K	1698	liq.->EuPd3 liq.: Pd 0.75; EuPd3: Pd 0.75	model	[1] Du 2001	Table 2, p. 3, row 14 report
Phase transition	1698 K	1698	liq.->EuPd3 liq.: Pd 0.75; EuPd3: Pd 0.75	experimental	[1] Du 2001 cites Iandelli 1974 doi	Table 2, p. 3, row 15 report

Formation (13)

Formation, Eu–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy of formation printed: ΔfS	9.236 J/mol-atom/K	298.15	Pd2Eu alloy: Eu 0.333333, Pd 0.666667	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 61 report
Entropy of formation printed: ΔfS	-13.95 J/mol-atom/K	298.15	Pd2Eu5 alloy: Eu 0.714286, Pd 0.285714	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 13 report
Entropy of formation	10.83 J/mol-atom/K	298.15	Pd3Eu alloy: Eu 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 3 report
Entropy of formation printed: ΔfS	6.2 J/mol-atom/K	298.15	Pd3Eu alloy: Eu 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Entropy of formation	6.2 J/mol-atom/K	298.15	Pd7Eu alloy: Eu 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Entropy of formation printed: Entropies of formation	6.2 J/mol-atom/K	298.15	Pd7RE alloy: Eu 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 6, row 7 report
Entropy of formation printed: ΔfS	8.461 J/mol-atom/K	298.15	PdEu alloy: Eu 0.5, Pd 0.5	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 23 report
Gibbs energy of formation printed: ΔfG	-107.384 kJ/mol-atom	298.15	Pd2Eu alloy: Eu 0.333333, Pd 0.666667	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 61 report
Gibbs energy of formation printed: Gibbs free energy of formation	-40.6068 kJ/mol-atom	298.15	Pd2Eu5 alloy: Eu 0.714286, Pd 0.285714	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 13 report
Gibbs energy of formation printed: Gibbs free energy of formation	-98.563 kJ/mol-atom	298.15	Pd3Eu alloy: Eu 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 3 report
Gibbs energy of formation printed: ΔfG	-53.0245 kJ/mol-atom	298.15	Pd3Eu alloy: Eu 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Gibbs energy of formation printed: Gibbs free energy of formation	-53.0245 kJ/mol-atom	298.15	Pd7Eu alloy: Eu 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 73 report
Gibbs energy of formation printed: ΔfG	-81.0676 kJ/mol-atom	298.15	PdEu alloy: Eu 0.5, Pd 0.5	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 5, row 23 report

Mixing / partial (1)

Mixing / partial, Eu–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Gibbs energy of mixing printed: Gibbs free Energies	-53.0245 kJ/mol-atom	298.15	Pd7RE alloy: Eu 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2001 doi	Table 3, p. 6, row 7 report

Sources

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

Zhenmin Du, Yuntao He, Thermodynamic assessment of the Eu–Pd system, Journal of Alloys and Compounds 327, 127-131 (2001). doi:10.1016/s0925-8388(01)01411-6
Said Kardellass, Colette Servant, Isabelle Drouelle, Fatima Zahra Chrifi-Alaoui, Mohamed Idbenali, Alyen Abahazem et al., Calphad-type assessment of the Pd-Yb binary system supported by first-principles calculations – Part II: Results, Materials Today: Proceedings 24, 140-150 (2020). doi:10.1016/j.matpr.2019.08.196

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}
}