Eu–Pd phases

11 phases (tier A 6, tier B 1, tier C 1, liquid 1, needs_review 2); 10 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Eu–Pd system page · Markdown · field reference

Phases of the Eu–Pd system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:eu-pd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1112.43 K, x(Pd) 0–0	2	1
EU3PD2 phase:eu-pd:eu3pd2	Er3Ni2 · hR15 · R-3 (148)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1081.6 K, x(Pd) 0.4–0.4	6	1
EU5PD2 phase:eu-pd:eu5pd2	Mn5C2 · mC28 · C2/c (15)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–882.9 K, x(Pd) 0.28571–0.28571	4	1
EUPD_B33 phase:eu-pd:eupd-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1125.23 K, x(Pd) 0.5–0.5	4	1
EUPD2_C15 phase:eu-pd:eupd2-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1606.68 K, x(Pd) 0.66667–0.66667	5	1
EUPD3_L12 phase:eu-pd:eupd3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1697.41 K, x(Pd) 0.75–0.75	6	1
EUPD5 phase:eu-pd:eupd5		needs_review	stable in 1 of 1 calculated diagram(s): 300–1377.41 K, x(Pd) 0.83333–0.83333	6	1
EUPD7 phase:eu-pd:eupd7		needs_review	stable in 1 of 1 calculated diagram(s): 300–850.13 K, x(Pd) 0.875–0.875	2	1
FCC_A1 phase:eu-pd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1973 K, x(Pd) 0.91066–1	4	1
HCP_A3 phase:eu-pd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:eu-pd:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 817.43–2500 K, x(Pd) 0–1	19	1

BCC_A2 (Eu–Pd)

Id: phase:eu-pd:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1112.43 K, x(Pd) 0–0
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:bcc-a2
paper: paper:10.1016/s0925-8388(01)01411-6:bcc(Eu)
tdb: tdb:EuPd-01Du-LB.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: BCC_A2, type code %B, sha256 108635fcb4bb16a2…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : EU% PD : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EU3PD2 (Eu–Pd)

Id: phase:eu-pd:eu3pd2; status assigned
Structure: Er3Ni2 · hR15 · R-3 (148); type st:er3ni2-hr15; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Eu 0.6000, Pd 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 300–1081.6 K, x(Pd) 0.4–0.4
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:eu-pd:eu3pd2
mp: mp:mp-aaackxba
oqmd: oqmd:oqmd-17217
paper: paper:10.1016/s0925-8388(01)01411-6:Eu3Pd2
tdb: tdb:EuPd-01Du-LB.tdb:EU3PD2

TDB models of EU3PD2 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EU3PD2, type code %, sha256 108635fcb4bb16a2…

50: PHASE EU3PD2 % 2 3 2 !
51: CONST EU3PD2 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EU5PD2 (Eu–Pd)

Id: phase:eu-pd:eu5pd2; status assigned
Structure: Mn5C2 · mC28 · C2/c (15); type st:mn5c2-mc28; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (dft_space_group_15_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.7143, Pd 0.2857
Stability: stable in 1 of 1 calculated diagram(s): 300–882.9 K, x(Pd) 0.28571–0.28571
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:eu5pd2
paper: paper:10.1016/s0925-8388(01)01411-6:Eu5Pd2
tdb: tdb:EuPd-01Du-LB.tdb:EU5PD2

TDB models of EU5PD2 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EU5PD2, type code %, sha256 108635fcb4bb16a2…

45: PHASE EU5PD2 % 2 5 2 !
46: CONST EU5PD2 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EUPD_B33 (Eu–Pd)

Id: phase:eu-pd:eupd-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacfydn and oqmd-30127, space group 63
Stoichiometry: Eu 0.5000, Pd 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1125.23 K, x(Pd) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:eu-pd:eupd-b33
mp: mp:mp-aaacfydn
oqmd: oqmd:oqmd-30127
paper: paper:10.1016/s0925-8388(01)01411-6:EuPd
tdb: tdb:EuPd-01Du-LB.tdb:EUPD_B33

TDB models of EUPD_B33 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EUPD_B33, type code %, sha256 108635fcb4bb16a2…

55: PHASE EUPD_B33 % 2 1 1 !
56: CONST EUPD_B33 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EUPD2_C15 (Eu–Pd)

Id: phase:eu-pd:eupd2-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacti and oqmd-30126, space group 227
Stoichiometry: Eu 0.3333, Pd 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1606.68 K, x(Pd) 0.66667–0.66667
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:eu-pd:eupd2-c15
mp: mp:mp-aaaaacti
oqmd: oqmd:oqmd-30126
paper: paper:10.1016/s0925-8388(01)01411-6:EuPd2
tdb: tdb:EuPd-01Du-LB.tdb:EUPD2_C15

TDB models of EUPD2_C15 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EUPD2_C15, type code %, sha256 108635fcb4bb16a2…

60: PHASE EUPD2_C15 % 2 1 2 !
61: CONST EUPD2_C15 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EUPD3_L12 (Eu–Pd)

Id: phase:eu-pd:eupd3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Stoichiometry: Eu 0.2500, Pd 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1697.41 K, x(Pd) 0.75–0.75
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:eupd3-l12
paper: paper:10.1016/s0925-8388(01)01411-6:EuPd3
tdb: tdb:EuPd-01Du-LB.tdb:EUPD3_L12

TDB models of EUPD3_L12 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EUPD3_L12, type code %, sha256 108635fcb4bb16a2…

65: PHASE EUPD3_L12 % 2 1 3 !
66: CONST EUPD3_L12 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

EUPD5 (Eu–Pd)

Id: phase:eu-pd:eupd5; status needs_review
No structure assigned. Why: no_on_hull_entry_in_mp; no_structure_token; sgte_mmc2_row_incomplete
Candidate (dft_oqmd): P6/mmm (191) — on-hull OQMD Eu1 Pd5 at x(PD)=0.8333
Candidate (literature_printed): (EuPd5) · o*72 — printed with a label mapped to this phase
Candidate (sgte_mmc2): (EuPd5) — Hallstedt 2025 mmc2 row for EUPD5: EuPd5
Stoichiometry: Eu 0.1667, Pd 0.8333
Stability: stable in 1 of 1 calculated diagram(s): 300–1377.41 K, x(Pd) 0.83333–0.83333
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:eupd5
paper: paper:10.1016/s0925-8388(01)01411-6:EuPd5
tdb: tdb:EuPd-01Du-LB.tdb:EUPD5

TDB models of EUPD5 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EUPD5, type code %, sha256 108635fcb4bb16a2…

70: PHASE EUPD5 % 2 1 5 !
71: CONST EUPD5 : EU : PD : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase
doi:10.1007/bf00585433 K. Takao, K. L. Zhao, Y. Sakamoto, Observations of an ordered Pd7Eu phase in Pd-Eu alloys, J Mater Sci 25, 1255-1260 (1990).
cited as the source of values for this phase

EUPD7 (Eu–Pd)

Id: phase:eu-pd:eupd7; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (EuPd7) · c** — printed with a label mapped to this phase
Candidate (sgte_mmc2): (EuPd7) — Hallstedt 2025 mmc2 row for EUPD7: EuPd7
Stoichiometry: Eu 0.1250, Pd 0.8750
Stability: stable in 1 of 1 calculated diagram(s): 300–850.13 K, x(Pd) 0.875–0.875
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:eupd7
paper: paper:10.1016/s0925-8388(01)01411-6:EuPd7
tdb: tdb:EuPd-01Du-LB.tdb:EUPD7

TDB models of EUPD7 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: EUPD7, type code %, sha256 108635fcb4bb16a2…

75: PHASE EUPD7 % 2 1 7 !
76: CONST EUPD7 : EU : PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1007/bf00585433 K. Takao, K. L. Zhao, Y. Sakamoto, Observations of an ordered Pd7Eu phase in Pd-Eu alloys, J Mater Sci 25, 1255-1260 (1990).
cited as the source of values for this phase

FCC_A1 (Eu–Pd)

Id: phase:eu-pd:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1973 K, x(Pd) 0.91066–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:fcc-a1
paper: paper:10.1016/s0925-8388(01)01411-6:fcc(Pd)
tdb: tdb:EuPd-01Du-LB.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: FCC_A1, type code %A, sha256 108635fcb4bb16a2…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : EU PD% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1007/bf00585433 K. Takao, K. L. Zhao, Y. Sakamoto, Observations of an ordered Pd7Eu phase in Pd-Eu alloys, J Mater Sci 25, 1255-1260 (1990).
cited as the source of values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

HCP_A3 (Eu–Pd)

Id: phase:eu-pd:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Pd 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-pd:hcp-a3
tdb: tdb:EuPd-01Du-LB.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: HCP_A3, type code %A, sha256 108635fcb4bb16a2…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : PD : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase

LIQUID (Eu–Pd)

Id: phase:eu-pd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 817.43–2500 K, x(Pd) 0–1
Literature: 19 values (19 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-pd:liquid
paper: paper:10.1016/s0925-8388(01)01411-6:liq.
tdb: tdb:EuPd-01Du-LB.tdb:LIQUID

TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written

EuPd-01Du-LB.tdb: LIQUID, type code %, sha256 108635fcb4bb16a2…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : EU PD : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(01)01411-6 Z. Du, Y. He, J. Alloys Compd., 327, 127-31(2001).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(74)90197-0 A. Iandelli, A. Palenzona, The europium-palladium system, Journal of the Less Common Metals 38, 1-7 (1974).
cited as the source of values for this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  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}
}