Eu–Ga phases

11 phases (tier A 5, tier C 4, liquid 1, needs_review 1); 9 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–Ga system page · Markdown · field reference

Phases of the Eu–Ga system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
ORTHORHOMBIC_A11 phase:eu-ga:a11-orthorhombic	alpha-Ga · A11 · oC8 · Cmce (64)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–302.91 K, x(Ga) 1–1	1
BCC_A2 phase:eu-ga:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1095.83 K, x(Ga) 0–2e-05	1
EU2GA3 phase:eu-ga:eu2ga3	Eu3Ga5 · oC32 · Amm2 (38)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1039.7 K, x(Ga) 0.6–0.6	1
EU2GA5 phase:eu-ga:eu2ga5	Eu3Ga8 · oI22 · Immm (71)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1288.28 K, x(Ga) 0.71429–0.71429	1
EU5GA3 phase:eu-ga:eu5ga3	Ga3Y5 · mC32 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–880.02 K, x(Ga) 0.375–0.375	1
EUGA phase:eu-ga:euga	EuGa · aP8 · P-1 (2)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–932.99 K, x(Ga) 0.5–0.5	1
EUGA2 phase:eu-ga:euga2		needs_review	stable in 1 of 1 calculated diagram(s): 300–1302.83 K, x(Ga) 0.66667–0.66667	1
EUGA4_D13 phase:eu-ga:euga4-d13	Al4Ba · D1_3 · tI10 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1243.46 K, x(Ga) 0.8–0.8	1
FCC_A1 phase:eu-ga:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:eu-ga:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LIQUID phase:eu-ga:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Ga) 0–1	1

ORTHORHOMBIC_A11 (Eu–Ga)

Id: phase:eu-ga:a11-orthorhombic; status assigned
Structure: alpha-Ga · A11 · oC8 · Cmce (64); type st:a11-alpha-ga-oc8; tier A: standard phase name; confidence high
Stoichiometry: Ga 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–302.91 K, x(Ga) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:a11-orthorhombic
tdb: tdb:EuGa-20Li.tdb:ORTHORHOMBIC_A11

TDB models of ORTHORHOMBIC_A11 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: ORTHORHOMBIC_A11, type code %, sha256 790bc609a7f1c76c…

57: PHASE ORTHORHOMBIC_A11 % 1 1 !
58: CONST ORTHORHOMBIC_A11 : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

BCC_A2 (Eu–Ga)

Id: phase:eu-ga: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): 300–1095.83 K, x(Ga) 0–2e-05
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:bcc-a2
tdb: tdb:EuGa-20Li.tdb:BCC_A2

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

EuGa-20Li.tdb: BCC_A2, type code %B, sha256 790bc609a7f1c76c…

47: PHASE BCC_A2 %B 2 1 3 !
48: CONST BCC_A2 : EU% GA : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EU2GA3 (Eu–Ga)

Id: phase:eu-ga:eu2ga3; status assigned
Structure: Eu3Ga5 · oC32 · Amm2 (38); type st:eu3ga5-oc32; 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 0.4000, Ga 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 300–1039.7 K, x(Ga) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:eu2ga3
tdb: tdb:EuGa-20Li.tdb:EU2GA3

TDB models of EU2GA3 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: EU2GA3, type code %, sha256 790bc609a7f1c76c…

72: PHASE EU2GA3 % 2 2 3 !
73: CONST EU2GA3 : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EU2GA5 (Eu–Ga)

Id: phase:eu-ga:eu2ga5; status assigned
Structure: Eu3Ga8 · oI22 · Immm (71); type st:eu3ga8-oi22; 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 0.2857, Ga 0.7143
Stability: stable in 1 of 1 calculated diagram(s): 300–1288.28 K, x(Ga) 0.71429–0.71429
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:eu2ga5
tdb: tdb:EuGa-20Li.tdb:EU2GA5

TDB models of EU2GA5 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: EU2GA5, type code %, sha256 790bc609a7f1c76c…

82: PHASE EU2GA5 % 2 2 5 !
83: CONST EU2GA5 : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EU5GA3 (Eu–Ga)

Id: phase:eu-ga:eu5ga3; status assigned
Structure: Ga3Y5 · mC32 · C2/m (12); type st:ga3y5-mc32; 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 0.6250, Ga 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–880.02 K, x(Ga) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:eu5ga3
tdb: tdb:EuGa-20Li.tdb:EU5GA3

TDB models of EU5GA3 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: EU5GA3, type code %, sha256 790bc609a7f1c76c…

62: PHASE EU5GA3 % 2 5 3 !
63: CONST EU5GA3 : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EUGA (Eu–Ga)

Id: phase:eu-ga:euga; status assigned
Structure: EuGa · aP8 · P-1 (2); type st:euga-ap8; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.5000, Ga 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–932.99 K, x(Ga) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:euga
tdb: tdb:EuGa-20Li.tdb:EUGA

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

EuGa-20Li.tdb: EUGA, type code %, sha256 790bc609a7f1c76c…

67: PHASE EUGA % 2 1 1 !
68: CONST EUGA : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EUGA2 (Eu–Ga)

Id: phase:eu-ga:euga2; status needs_review
No structure assigned. Why: dft_space_group_74_matches_2_structure_types; no_structure_token; sgte_mmc2_row_disagrees_with_dft; sgte_mmc2_rows_disagree
Candidate (dft_mp): Imma (74) — on-hull MP EuGa2 at x(GA)=0.6667
Candidate (dft_oqmd): Imma (74) — on-hull OQMD Eu1 Ga2 at x(GA)=0.6667
Candidate (dft_space_group_and_stoichiometry): CeCu2 · oI12 · Imma (74) — space group 74 and stoichiometry match
Candidate (dft_space_group_and_stoichiometry): Hg2K · oI12 · Imma (74) — space group 74 and stoichiometry match
Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for EUGA2: EuGa2 (high T, see also Hg2K)
Candidate (sgte_mmc2): Hg2K · oI12 · Imma (74) — Hallstedt 2025 mmc2 row for EUGA2: EuGa2 (low T, see also AlB2)
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — EuGa-20Li.tdb: 'Prototype AlB2 (hP3, P6/mmm), ht and Hg2K (oI12, Imma), lt'
Stoichiometry: Eu 0.3333, Ga 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1302.83 K, x(Ga) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:euga2
tdb: tdb:EuGa-20Li.tdb:EUGA2

TDB models of EUGA2 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: EUGA2, type code %, sha256 790bc609a7f1c76c…

77: PHASE EUGA2 % 2 1 2 !
78: CONST EUGA2 : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

EUGA4_D13 (Eu–Ga)

Id: phase:eu-ga:euga4-d13; status assigned
Structure: Al4Ba · D1_3 · tI10 · I4/mmm (139); type st:d1-3-al4ba-ti10; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabgjs and oqmd-30076, space group 139
Stoichiometry: Eu 0.2000, Ga 0.8000
Stability: stable in 1 of 1 calculated diagram(s): 300–1243.46 K, x(Ga) 0.8–0.8
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:eu-ga:euga4-d13
mp: mp:mp-aaaabgjs
oqmd: oqmd:oqmd-30076
tdb: tdb:EuGa-20Li.tdb:EUGA4_D13

TDB models of EUGA4_D13 (1): PHASE and CONSTITUENT statements as written

EuGa-20Li.tdb: EUGA4_D13, type code %, sha256 790bc609a7f1c76c…

87: PHASE EUGA4_D13 % 2 1 4 !
88: CONST EUGA4_D13 : EU : GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

FCC_A1 (Eu–Ga)

Id: phase:eu-ga:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Ga 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-ga:fcc-a1
tdb: tdb:EuGa-20Li.tdb:FCC_A1

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

EuGa-20Li.tdb: FCC_A1, type code %A, sha256 790bc609a7f1c76c…

42: PHASE FCC_A1 %A 2 1 1 !
43: CONST FCC_A1 : GA : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

HCP_A3 (Eu–Ga)

Id: phase:eu-ga: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: Ga 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-ga:hcp-a3
tdb: tdb:EuGa-20Li.tdb:HCP_A3

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

EuGa-20Li.tdb: HCP_A3, type code %A, sha256 790bc609a7f1c76c…

52: PHASE HCP_A3 %A 2 1 0.5 !
53: CONST HCP_A3 : GA : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models this phase

LIQUID (Eu–Ga)

Id: phase:eu-ga:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Ga) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-ga:liquid
tdb: tdb:EuGa-20Li.tdb:LIQUID

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

EuGa-20Li.tdb: LIQUID, type code %, sha256 790bc609a7f1c76c…

37: PHASE LIQUID:L % 1 1 !
38: CONST LIQUID:L : EU GA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111868 F. Li, J. Liu, Q. Li, C. Guo, X. Zhang, J. Xiao, Int. J. Mater. Res., 111, 214-19(2020).
assessment that models 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}
}