Eu–In phases

10 phases (tier A 6, tier C 2, liquid 1, needs_review 1); 8 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–In system page · Markdown · field reference

Phases of the Eu–In system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
TETRAGONAL_A6 phase:eu-in:a6-tetragonal	In · A6 · tI2 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2332.31 K, x(In) 1–1	2	1
BCC_A2 phase:eu-in:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1104.27 K, x(In) 0–0	2	1
EU2IN_HT phase:eu-in:eu2in		needs_review	stable in 1 of 1 calculated diagram(s): 933.12–985.13 K, x(In) 0.33333–0.33333	0	1
EU2IN_C37 phase:eu-in:eu2in-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–933.13 K, x(In) 0.33333–0.33333	2	1
EUIN_B11 phase:eu-in:euin-b11	CuTi-gamma · B11 · tP4 · P4/nmm (129)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1193.39 K, x(In) 0.5–0.5	4	1
EUIN2 phase:eu-in:euin2	CaIn2 · hP6 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1253.25 K, x(In) 0.66667–0.66667	4	1
EUIN4 phase:eu-in:euin4	EuIn4 · mC20 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–723.16 K, x(In) 0.8–0.8	4	1
FCC_A1 phase:eu-in:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:eu-in: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-in:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 427.31–2500 K, x(In) 0–1	13	1

TETRAGONAL_A6 (Eu–In)

Id: phase:eu-in:a6-tetragonal; status assigned
Structure: In · A6 · tI2 · I4/mmm (139); type st:a6-in-ti2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2332.31 K, x(In) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:eu-in:a6-tetragonal, corpus:phase:eu-in:tetragonal-a6
paper: paper:10.1016/j.calphad.2010.10.003:(In)
tdb: tdb:EuIn-11Gao.tdb:TETRAGONAL_A6

TDB models of TETRAGONAL_A6 (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: TETRAGONAL_A6, type code %, sha256 f11aee1473af8324…

42: PHASE TETRAGONAL_A6 % 1 1 !
43: CONST TETRAGONAL_A6 : EU IN% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02841697 H. Okamoto, Bull. Alloy Phase Diagr. 11 (2) (1990) 140–143.
cited as the source of values for this phase

BCC_A2 (Eu–In)

Id: phase:eu-in: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): 300–1104.27 K, x(In) 0–0
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:bcc-a2
paper: paper:10.1016/j.calphad.2010.10.003:(Eu)
tdb: tdb:EuIn-11Gao.tdb:BCC_A2

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

EuIn-11Gao.tdb: BCC_A2, type code %B, sha256 f11aee1473af8324…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : EU% IN : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase

EU2IN_HT (Eu–In)

Id: phase:eu-in:eu2in; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (dft_mp): Pnma (62) — on-hull MP Eu2In at x(IN)=0.3333
Candidate (sgte_mmc2): (Eu2In-ht) — Hallstedt 2025 mmc2 row for EU2IN_HT: Eu2In-ht
Stoichiometry: Eu 0.6667, In 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 933.12–985.13 K, x(In) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:eu2in, corpus:phase:eu-in:eu2in-ht
tdb: tdb:EuIn-11Gao.tdb:EU2IN_HT

TDB models of EU2IN_HT (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: EU2IN_HT, type code %, sha256 f11aee1473af8324…

52: PHASE EU2IN_HT % 2 2 1 !
53: CONST EU2IN_HT : EU : IN : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase

EU2IN_C37 (Eu–In)

Id: phase:eu-in:eu2in-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Stoichiometry: Eu 0.6667, In 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–933.13 K, x(In) 0.33333–0.33333
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:eu2in-c37
paper: paper:10.1016/j.calphad.2010.10.003:αInEu2
tdb: tdb:EuIn-11Gao.tdb:EU2IN_C37

TDB models of EU2IN_C37 (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: EU2IN_C37, type code %, sha256 f11aee1473af8324…

47: PHASE EU2IN_C37 % 2 2 1 !
48: CONST EU2IN_C37 : EU : IN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase

EUIN_B11 (Eu–In)

Id: phase:eu-in:euin-b11; status assigned
Structure: CuTi-gamma · B11 · tP4 · P4/nmm (129); type st:b11-cuti-gamma-tp4; tier A: standard phase name; confidence high
Stoichiometry: Eu 0.5000, In 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1193.39 K, x(In) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:euin-b11
paper: paper:10.1016/j.calphad.2010.10.003:InEu
tdb: tdb:EuIn-11Gao.tdb:EUIN_B11

TDB models of EUIN_B11 (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: EUIN_B11, type code %, sha256 f11aee1473af8324…

57: PHASE EUIN_B11 % 2 1 1 !
58: CONST EUIN_B11 : EU : IN : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02841697 H. Okamoto, Bull. Alloy Phase Diagr. 11 (2) (1990) 140–143.
cited as the source of values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase

EUIN2 (Eu–In)

Id: phase:eu-in:euin2; status assigned
Structure: CaIn2 · hP6 · P6_3/mmc (194); type st:cain2-hp6; 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_194_matches_3_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.3333, In 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1253.25 K, x(In) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:euin2
paper: paper:10.1016/j.calphad.2010.10.003:In2Eu
tdb: tdb:EuIn-11Gao.tdb:EUIN2

TDB models of EUIN2 (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: EUIN2, type code %, sha256 f11aee1473af8324…

62: PHASE EUIN2 % 2 1 2 !
63: CONST EUIN2 : EU : IN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase

EUIN4 (Eu–In)

Id: phase:eu-in:euin4; status assigned
Structure: EuIn4 · mC20 · C2/m (12); type st:euin4-mc20; 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 (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.2000, In 0.8000
Stability: stable in 1 of 1 calculated diagram(s): 300–723.16 K, x(In) 0.8–0.8
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-in:euin4
paper: paper:10.1016/j.calphad.2010.10.003:In4Eu
tdb: tdb:EuIn-11Gao.tdb:EUIN4

TDB models of EUIN4 (1): PHASE and CONSTITUENT statements as written

EuIn-11Gao.tdb: EUIN4, type code %, sha256 f11aee1473af8324…

67: PHASE EUIN4 % 2 1 4 !
68: CONST EUIN4 : EU : IN : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02841697 H. Okamoto, Bull. Alloy Phase Diagr. 11 (2) (1990) 140–143.
cited as the source of values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase

FCC_A1 (Eu–In)

Id: phase:eu-in:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: In 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-in:fcc-a1
tdb: tdb:EuIn-11Gao.tdb:FCC_A1

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

EuIn-11Gao.tdb: FCC_A1, type code %A, sha256 f11aee1473af8324…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : IN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase

HCP_A3 (Eu–In)

Id: phase:eu-in: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: In 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-in:hcp-a3
tdb: tdb:EuIn-11Gao.tdb:HCP_A3

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

EuIn-11Gao.tdb: HCP_A3, type code %A, sha256 f11aee1473af8324…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : IN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase

LIQUID (Eu–In)

Id: phase:eu-in:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 427.31–2500 K, x(In) 0–1
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:eu-in:liquid
paper: paper:10.1016/j.calphad.2010.10.003:L, paper:10.1016/j.calphad.2010.10.003:liquid
tdb: tdb:EuIn-11Gao.tdb:LIQUID

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

EuIn-11Gao.tdb: LIQUID, type code %, sha256 f11aee1473af8324…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : EU IN : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.10.003 F. Gao, S.L. Wang, C.P. Wang, X.J. Liu, Thermodynamic assessments of the In–Eu and In–Yb systems, Calphad 35, 1-5 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(83)90121-2 S.P. Yatsenko, A.A. Semyannikov, H.O. Shakarov, E.G. Fedorova, Phase diagrams of binary rare earth metal-indium systems, Journal of the Less Common Metals 90, 95-108 (1983).
cited as the source of values for this phase
doi:10.1007/bf02841697 H. Okamoto, Bull. Alloy Phase Diagr. 11 (2) (1990) 140–143.
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}
}