Er–Pd system

52 accepted literature values from 2 paper(s) (experimental 15, model 37); 1 calculated phase diagram(s). 3 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (14) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	15
model	37

Accepted values by property group
Property group	Values
invariant reaction	21
phase transition	10
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
ErPd-00Du.tdb	Z. Du, H. Yang, J. Alloys Compd., 299, 199-204(2000). doi:10.1016/S0925-8388(99)00691-X	`cc635afc1ea75b3485fa581bb0d5aa3f97d047a8867fbd44491a2e8bb96266f5`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
ErPd-00Du.tdb	1702.46	ERPD_B2 (x(Pd) 0.49997) + LIQUID (x(Pd) 0.55066) + ER3PD4 (x(Pd) 0.57143)
ErPd-00Du.tdb	1702.46	ERPD_B2 (x(Pd) 0.49997) + LIQUID (x(Pd) 0.55071) + ER3PD4 (x(Pd) 0.57143)
ErPd-00Du.tdb	1607.77	LIQUID (x(Pd) 0.64578) + ER10PD21 (x(Pd) 0.67742) + ERPD3_L12 (x(Pd) 0.75)
ErPd-00Du.tdb	1607.77	LIQUID (x(Pd) 0.64582) + ER10PD21 (x(Pd) 0.67742) + ERPD3_L12 (x(Pd) 0.75)
ErPd-00Du.tdb	1595.68	ER3PD4 (x(Pd) 0.57143) + ER2PD3_HT (x(Pd) 0.6) + LIQUID (x(Pd) 0.62147)
ErPd-00Du.tdb	1595.68	ER3PD4 (x(Pd) 0.57143) + ER2PD3_HT (x(Pd) 0.6) + LIQUID (x(Pd) 0.62139)
ErPd-00Du.tdb	1565.87	ER2PD3_HT (x(Pd) 0.6) + LIQUID (x(Pd) 0.63188) + ER10PD21 (x(Pd) 0.67742)
ErPd-00Du.tdb	1565.86	ER2PD3_HT (x(Pd) 0.6) + LIQUID (x(Pd) 0.63183) + ER10PD21 (x(Pd) 0.67742)
ErPd-00Du.tdb	1565.86	ER2PD3_HT (x(Pd) 0.6) + LIQUID (x(Pd) 0.6318) + ER10PD21 (x(Pd) 0.67742)
ErPd-00Du.tdb	1552.65	ERPD3_L12 (x(Pd) 0.78815) + LIQUID (x(Pd) 0.8563) + FCC_A1 (x(Pd) 0.88152)
ErPd-00Du.tdb	1423.12	ER3PD4 (x(Pd) 0.57143) + ER2PD3_LT (x(Pd) 0.6) + ER2PD3_HT (x(Pd) 0.6)
ErPd-00Du.tdb	1423.12	ER2PD3_HT (x(Pd) 0.6) + ER2PD3_LT (x(Pd) 0.6) + ER10PD21 (x(Pd) 0.67742)
ErPd-00Du.tdb	1264.91	LIQUID (x(Pd) 0.364) + ER3PD2_D5A (x(Pd) 0.4) + ERPD_B2 (x(Pd) 0.47745)
ErPd-00Du.tdb	1195.62	ER5PD2 (x(Pd) 0.28571) + LIQUID (x(Pd) 0.32002) + ER3PD2_D5A (x(Pd) 0.4)
ErPd-00Du.tdb	1195.61	ER5PD2 (x(Pd) 0.28571) + LIQUID (x(Pd) 0.31983) + ER3PD2_D5A (x(Pd) 0.4)
ErPd-00Du.tdb	1189.65	HCP_A3 (x(Pd) 0) + LIQUID (x(Pd) 0.2417) + ER5PD2 (x(Pd) 0.28571)
ErPd-00Du.tdb	1189.65	HCP_A3 (x(Pd) 0) + LIQUID (x(Pd) 0.24168) + ER5PD2 (x(Pd) 0.28571)
ErPd-00Du.tdb	838.14	ER3PD2_D5A (x(Pd) 0.4) + ERPD_B27 (x(Pd) 0.4942) + ERPD_B2 (x(Pd) 0.49651)
ErPd-00Du.tdb	838.13	ER3PD2_D5A (x(Pd) 0.4) + ERPD_B27 (x(Pd) 0.49417) + ERPD_B2 (x(Pd) 0.49649)
ErPd-00Du.tdb	821.12	ERPD_B2 (x(Pd) 0.5) + ERPD_B27 (x(Pd) 0.5) + ER3PD4 (x(Pd) 0.57143)
ErPd-00Du.tdb	723.01	ERPD3_L12 (x(Pd) 0.78154) + ERPD7 (x(Pd) 0.875) + FCC_A1 (x(Pd) 0.89134)
ErPd-00Du.tdb	723.01	ERPD3_L12 (x(Pd) 0.78154) + ERPD7 (x(Pd) 0.875) + FCC_A1 (x(Pd) 0.89134)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Er–Pd system (21)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1703	eutectic: Liq.->βErPd+Er3Pd4	Liq.: Pd 0.5507; βErPd: Pd 0.5; Er3Pd4: Pd 0.571429	model	[1] Du 2000	Table 2, p. 5, row 13 report
1703	eutectic: Liq.->βErPd+Er3Pd4	Liq.: Pd 0.535; βErPd: Pd 0.5; Er3Pd4: Pd 0.571429	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 14 report
1608	Liq.+ErPd3->Er10Pd21	Liq.: Pd 0.6458; ErPd3: Pd 0.75; Er10Pd21: Pd 0.677419	model	[1] Du 2000	Table 2, p. 5, row 25 report
1608	Liq.+ErPd3->Er10Pd21	Liq.: Pd 0.659; ErPd3: Pd 0.75; Er10Pd21: Pd 0.677419	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 26 report
1596	Liq.+Er3Pd4->βEr2Pd3	Liq.: Pd 0.626; Er3Pd4: Pd 0.571429; βEr2Pd3: Pd 0.6	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 20 report
1596	Liq.+Er3Pd4->βEr2Pd3	Liq.: Pd 0.6215; Er3Pd4: Pd 0.571429; βEr2Pd3: Pd 0.6	model	[1] Du 2000	Table 2, p. 5, row 19 report
1568	eutectic: Liq.->βEr2Pd3+Er10Pd21	Liq.: Pd 0.635; βEr2Pd3: Pd 0.6; Er10Pd21: Pd 0.677419	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 22 report
1566	eutectic: Liq.->βEr2Pd3+Er10Pd21	Liq.: Pd 0.6318; βEr2Pd3: Pd 0.6; Er10Pd21: Pd 0.677419	model	[1] Du 2000	Table 2, p. 5, row 21 report
1553	eutectic: Liq.->ErPd3+f.c.c.(Pd)	Liq.: Pd 0.86; ErPd3: Pd 0.795; f.c.c.(Pd): Pd 0.87	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 30 report
1553	eutectic: Liq.->ErPd3+f.c.c.(Pd)	Liq.: Pd 0.8563; ErPd3: Pd 0.7882; f.c.c.(Pd): Pd 0.8815	model	[1] Du 2000	Table 2, p. 5, row 29 report
1265	Liq.+βErPd->Er3Pd2	Liq.: Pd 0.364; βErPd: Pd 0.4774; Er3Pd2: Pd 0.4	model	[1] Du 2000	Table 2, p. 5, row 9 report
1264	Liq.+βErPd->Er3Pd2	Liq.: Pd 0.35; βErPd: Pd 0.491; Er3Pd2: Pd 0.4	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 10 report
1196	eutectic: Liq.->Er5Pd2+Er3Pd2	Liq.: Pd 0.315; Er5Pd2: Pd 0.285714; Er3Pd2: Pd 0.4	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 6 report
1196	eutectic: Liq.->Er5Pd2+Er3Pd2	Liq.: Pd 0.3198; Er5Pd2: Pd 0.285714; Er3Pd2: Pd 0.4	model	[1] Du 2000	Table 2, p. 5, row 5 report
1190	eutectic: Liq.->h.c.p.(Er)+Er5Pd2	Liq.: Pd 0.2417; h.c.p.(Er): Pd 0; Er5Pd2: Pd 0.285714	model	[1] Du 2000	Table 2, p. 5, row 1 report
1188	eutectic: Liq.->h.c.p.(Er)+Er5Pd2	Liq.: Pd 0.265; h.c.p.(Er): Pd 0; Er5Pd2: Pd 0.285714	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 2 report
838	Er3Pd2+βErPd->αErPd	Er3Pd2: Pd 0.4; βErPd: Pd 0.491; αErPd: Pd 0.491	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 8 report
838	Er3Pd2+βErPd->αErPd	Er3Pd2: Pd 0.4; βErPd: Pd 0.4965; αErPd: Pd 0.4942	model	[1] Du 2000	Table 2, p. 5, row 7 report
821	βErPd->αErPd+Er3Pd4	βErPd: Pd 0.5; αErPd: Pd 0.5; Er3Pd4: Pd 0.571429	model	[1] Du 2000	Table 2, p. 5, row 15 report
821	βErPd->αErPd+Er3Pd4	βErPd: Pd 0.5; αErPd: Pd 0.5; Er3Pd4: Pd 0.571429	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 16 report
723	f.c.c.(Pd)+ErPd3->ErPd7	f.c.c.(Pd): Pd 0.8913; ErPd3: Pd 0.7815; ErPd7: Pd 0.875	model	[1] Du 2000	Table 2, p. 5, row 31 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, Er–Pd system (7)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Pd21Er10		-94.07 kJ/mol-atom	298.15	model			[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 44 report
Pd3Er	ErPd3	-94.07 kJ/mol-atom	298.15	model	-88.405 (mp-aaaaaeer)	-88.196 (oqmd-18320)	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 6 report
Pd3Er	ErPd3	-55.755 kJ/mol-atom	298.15	model	-88.405 (mp-aaaaaeer)	-88.196 (oqmd-18320)	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Pd4Er3	Er3Pd4	-92.573 kJ/mol-atom	298.15	model	-93.36 (mp-aaackwhi)	-93.559 (oqmd-30026)	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 38 report
Pd7Er		-55.755 kJ/mol-atom	298.15	model			[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Pd7RE		-55.755 kJ/mol-atom	298.15	model			[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 6, row 10 report
PdEr	ErPd	-90.231 kJ/mol-atom	298.15	model	-89.841 (mp-aaaaabgt)	-92.218 (oqmd-1372126)	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 26 report

Other properties

Phase transition (10)

Phase transition, Er–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	1212 K	1212	Liq.->Er5Pd2 Liq.: Pd 0.285714; Er5Pd2: Pd 0.285714	model	[1] Du 2000	Table 2, p. 5, row 3 report
Phase transition	1213 K	1213	Liq.->Er5Pd2 Liq.: Pd 0.285714; Er5Pd2: Pd 0.285714	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 4 report
Phase transition	1423 K	1423	βEr2Pd3->αEr2Pd3 βEr2Pd3: Pd 0.6; αEr2Pd3: Pd 0.6	model	[1] Du 2000	Table 2, p. 5, row 23 report
Phase transition	1423 K	1423	βEr2Pd3->αEr2Pd3 βEr2Pd3: Pd 0.6; αEr2Pd3: Pd 0.6	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 24 report
Phase transition	1722 K	1722	Liq.->Er3Pd4 Liq.: Pd 0.571429; Er3Pd4: Pd 0.571429	model	[1] Du 2000	Table 2, p. 5, row 17 report
Phase transition	1723 K	1723	Liq.->Er3Pd4 Liq.: Pd 0.571429; Er3Pd4: Pd 0.571429	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 18 report
Phase transition	1813 K	1813	Liq.->βErPd Liq.: Pd 0.5; βErPd: Pd 0.5	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 12 report
Phase transition	1813 K	1813	Liq.->βErPd Liq.: Pd 0.4994; βErPd: Pd 0.5	model	[1] Du 2000	Table 2, p. 5, row 11 report
Phase transition	1983 K	1983	Liq.->ErPd3 Liq.: Pd 0.75; ErPd3: Pd 0.75	experimental	[1] Du 2000 cites Loebich 1973 doi	Table 2, p. 5, row 28 report
Phase transition	1983 K	1983	Liq.->ErPd3 Liq.: Pd 0.7501; ErPd3: Pd 0.75	model	[1] Du 2000	Table 2, p. 5, row 27 report

Formation (13)

Formation, Er–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy of formation printed: ΔfS	5.723 J/mol-atom/K	298.15	Pd21Er10 alloy: Er 0.322581, Pd 0.677419	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 44 report
Entropy of formation	5.723 J/mol-atom/K	298.15	Pd3Er alloy: Er 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 6 report
Entropy of formation printed: ΔfS	7.36 J/mol-atom/K	298.15	Pd3Er alloy: Er 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Entropy of formation printed: ΔfS	-0.549 J/mol-atom/K	298.15	Pd4Er3 alloy: Er 0.428571, Pd 0.571429	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 38 report
Entropy of formation	7.36 J/mol-atom/K	298.15	Pd7Er alloy: Er 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Entropy of formation printed: Entropies of formation	7.36 J/mol-atom/K	298.15	Pd7RE alloy: Er 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 6, row 10 report
Entropy of formation printed: ΔfS	-0.862 J/mol-atom/K	298.15	PdEr alloy: Er 0.5, Pd 0.5	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 26 report
Gibbs energy of formation printed: ΔfG	-95.7763 kJ/mol-atom	298.15	Pd21Er10 alloy: Er 0.322581, Pd 0.677419	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 44 report
Gibbs energy of formation printed: ΔfG	-95.7763 kJ/mol-atom	298.15	Pd3Er alloy: Er 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 6 report
Gibbs energy of formation printed: ΔfG	-57.9494 kJ/mol-atom	298.15	Pd3Er alloy: Er 0.25, Pd 0.75	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Gibbs energy of formation printed: ΔfG	-92.4093 kJ/mol-atom	298.15	Pd4Er3 alloy: Er 0.428571, Pd 0.571429	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 38 report
Gibbs energy of formation printed: Gibbs free energy of formation	-57.9494 kJ/mol-atom	298.15	Pd7Er alloy: Er 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 76 report
Gibbs energy of formation printed: Gibbs free energy of formation	-89.974 kJ/mol-atom	298.15	PdEr alloy: Er 0.5, Pd 0.5	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 5, row 26 report

Mixing / partial (1)

Mixing / partial, Er–Pd system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Gibbs energy of mixing printed: Gibbs free Energies	-57.9494 kJ/mol-atom	298.15	Pd7RE alloy: Er 0.125, Pd 0.875	model	[2] Kardellass 2020 cites Du 2000 doi	Table 3, p. 6, row 10 report

Sources

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

Zhenmin Du, Haifang Yang, Thermodynamic modelling of the Er–Pd system, Journal of Alloys and Compounds 299, 199-204 (2000). doi:10.1016/s0925-8388(99)00691-x
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}
}