Ga–Ho phases

10 phases (tier A 7, tier C 1, 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 · Ga–Ho system page · Markdown · field reference

Phases of the Ga–Ho system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A11 phase:ga-ho: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(Ho) 0–0	5	1
BCC_A2 phase:ga-ho:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:ga-ho:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GA2HO_C32 phase:ga-ho:ga2ho-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1574.41 K, x(Ho) 0.33333–0.33333	11	1
GA3HO phase:ga-ho:ga3ho		needs_review	stable in 1 of 1 calculated diagram(s): 300–1166.09 K, x(Ho) 0.25–0.25	9	1
GA3HO5_D88 phase:ga-ho:ga3ho5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1552.37 K, x(Ho) 0.625–0.625	8	1
GA6HO phase:ga-ho:ga6ho	Ga6Pu · tP14 · P4/nbm (125)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–564.91 K, x(Ho) 0.14286–0.14286	9	1
GAHO_B33 phase:ga-ho:gaho-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1556.18 K, x(Ho) 0.5–0.5	9	1
HCP_A3 phase:ga-ho:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.45 K, x(Ho) 0.99999–1	4	1
LIQUID phase:ga-ho:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Ho) 0–1	30	1

ORTHORHOMBIC_A11 (Ga–Ho)

Id: phase:ga-ho: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(Ho) 0–0
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ga-ho:a11-orthorhombic, corpus:phase:ga-ho:orthorhombic-a11
paper: paper:10.1007/s10973-019-08689-5:(Ga)
tdb: tdb:GaHo-20Ait.tdb:ORTHORHOMBIC_A11

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

GaHo-20Ait.tdb: ORTHORHOMBIC_A11, type code %, sha256 97e610d6cbfd4c80…

47: PHASE ORTHORHOMBIC_A11 % 1 1 !
48: CONST ORTHORHOMBIC_A11 : GA : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase
doi:10.1016/0025-5416(82)90075-1 Joshua Pelleg, G. Kimmel, The HoGa system in the 66.7–100 at.% Ga range, Materials Science and Engineering 52, P1-P7 (1982).
cited as the source of values for this phase

BCC_A2 (Ga–Ho)

Id: phase:ga-ho:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
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:ga-ho:bcc-a2
tdb: tdb:GaHo-20Ait.tdb:BCC_A2

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

GaHo-20Ait.tdb: BCC_A2, type code %B, sha256 97e610d6cbfd4c80…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : GA HO% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase

FCC_A1 (Ga–Ho)

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

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

GaHo-20Ait.tdb: FCC_A1, type code %A, sha256 97e610d6cbfd4c80…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : GA HO : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase

GA2HO_C32 (Ga–Ho)

Id: phase:ga-ho:ga2ho-c32; status assigned
Structure: AlB2 · C32 · hP3 · P6/mmm (191); type st:c32-alb2-hp3; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabwi and oqmd-19196, space group 191
Stoichiometry: Ga 0.6667, Ho 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1574.41 K, x(Ho) 0.33333–0.33333
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ga-ho:ga2ho-c32
mp: mp:mp-aaaaabwi
oqmd: oqmd:oqmd-19196
paper: paper:10.1007/s10973-019-08689-5:HoGa2
tdb: tdb:GaHo-20Ait.tdb:GA2HO_C32

TDB models of GA2HO_C32 (1): PHASE and CONSTITUENT statements as written

GaHo-20Ait.tdb: GA2HO_C32, type code %, sha256 97e610d6cbfd4c80…

66: PHASE GA2HO_C32 % 2 2 1 !
67: CONST GA2HO_C32 : GA : HO : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase
doi:10.1016/0025-5416(82)90075-1 Joshua Pelleg, G. Kimmel, The HoGa system in the 66.7–100 at.% Ga range, Materials Science and Engineering 52, P1-P7 (1982).
cited as the source of values for this phase

GA3HO (Ga–Ho)

Id: phase:ga-ho:ga3ho; status needs_review
No structure assigned. Why: mp_oqmd_space_groups_differ; no_structure_token; sgte_mmc2_rows_disagree
Candidate (dft_mp): Pm-3m (221) — on-hull MP HoGa3 at x(HO)=0.2500
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Ga3 Ho1 at x(HO)=0.2500
Candidate (literature_printed): Al3Ho · hR20 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Al3Ho · hR20 · R-3m (166) — Hallstedt 2025 mmc2 row for GA3HO: Ga3Ho (gamma, see also Ni3Ti, Pd2RhTa, Al3Pu, AuCu3)
Candidate (sgte_mmc2): Al3Pu · hP24 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for GA3HO: Ga3Ho (delta, see also Ni3Ti, Pd2RhTa, Al3Ho, AuCu3)
Candidate (sgte_mmc2): Ni3Ti · D0_24 · hP16 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for GA3HO: Ga3Ho (alpha, see also Pd2RhTa, Al3Ho, Al3Pu, AuCu3)
Candidate (sgte_mmc2): AuCu3 · L1_2 · cP4 · Pm-3m (221) — Hallstedt 2025 mmc2 row for GA3HO: Ga3Ho (epsilon, see also Ni3Ti, Pd2RhTa, Al3Ho, Al3Pu)
Candidate (sgte_mmc2): Pd2RhTa · hP40 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for GA3HO: Ga3Ho (beta, see also Ni3Ti, Al3Ho, Al3Pu, AuCu3)
Stoichiometry: Ga 0.7500, Ho 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1166.09 K, x(Ho) 0.25–0.25
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-ho:ga3ho
paper: paper:10.1007/s10973-019-08689-5:HoGa3
tdb: tdb:GaHo-20Ait.tdb:GA3HO

TDB models of GA3HO (1): PHASE and CONSTITUENT statements as written

GaHo-20Ait.tdb: GA3HO, type code %, sha256 97e610d6cbfd4c80…

61: PHASE GA3HO % 2 3 1 !
62: CONST GA3HO : GA : HO : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0025-5416(82)90075-1 Joshua Pelleg, G. Kimmel, The HoGa system in the 66.7–100 at.% Ga range, Materials Science and Engineering 52, P1-P7 (1982).
cited as the source of values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GA3HO5_D88 (Ga–Ho)

Id: phase:ga-ho:ga3ho5-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Stoichiometry: Ga 0.3750, Ho 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1552.37 K, x(Ho) 0.625–0.625
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-ho:ga3ho5-d88
paper: paper:10.1007/s10973-019-08689-5:Ho5Ga3
tdb: tdb:GaHo-20Ait.tdb:GA3HO5_D88

TDB models of GA3HO5_D88 (1): PHASE and CONSTITUENT statements as written

GaHo-20Ait.tdb: GA3HO5_D88, type code %, sha256 97e610d6cbfd4c80…

76: PHASE GA3HO5_D88 % 2 3 5 !
77: CONST GA3HO5_D88 : GA : HO : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GA6HO (Ga–Ho)

Id: phase:ga-ho:ga6ho; status assigned
Structure: Ga6Pu · tP14 · P4/nbm (125); type st:ga6pu-tp14; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ga 0.8571, Ho 0.1429
Stability: stable in 1 of 1 calculated diagram(s): 300–564.91 K, x(Ho) 0.14286–0.14286
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-ho:ga6ho
paper: paper:10.1007/s10973-019-08689-5:HoGa6
tdb: tdb:GaHo-20Ait.tdb:GA6HO

TDB models of GA6HO (1): PHASE and CONSTITUENT statements as written

GaHo-20Ait.tdb: GA6HO, type code %, sha256 97e610d6cbfd4c80…

52: PHASE GA6HO % 2 6 1 !
53: CONST GA6HO : GA : HO : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0025-5416(82)90075-1 Joshua Pelleg, G. Kimmel, The HoGa system in the 66.7–100 at.% Ga range, Materials Science and Engineering 52, P1-P7 (1982).
cited as the source of values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GAHO_B33 (Ga–Ho)

Id: phase:ga-ho:gaho-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-aaacfyar and oqmd-30286, space group 63
Stoichiometry: Ga 0.5000, Ho 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1556.18 K, x(Ho) 0.5–0.5
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ga-ho:gaho-b33
mp: mp:mp-aaacfyar
oqmd: oqmd:oqmd-30286
paper: paper:10.1007/s10973-019-08689-5:HoGa
tdb: tdb:GaHo-20Ait.tdb:GAHO_B33

TDB models of GAHO_B33 (1): PHASE and CONSTITUENT statements as written

GaHo-20Ait.tdb: GAHO_B33, type code %, sha256 97e610d6cbfd4c80…

71: PHASE GAHO_B33 % 2 1 1 !
72: CONST GAHO_B33 : GA : HO : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

HCP_A3 (Ga–Ho)

Id: phase:ga-ho:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2499.45 K, x(Ho) 0.99999–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-ho:hcp-a3
paper: paper:10.1007/s10973-019-08689-5:(Ho)
tdb: tdb:GaHo-20Ait.tdb:HCP_A3

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

GaHo-20Ait.tdb: HCP_A3, type code %, sha256 97e610d6cbfd4c80…

42: PHASE HCP_A3 % 2 1 0.5 !
43: CONST HCP_A3 : GA HO% : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

LIQUID (Ga–Ho)

Id: phase:ga-ho: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(Ho) 0–1
Literature: 30 values (30 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-ho:liquid
paper: paper:10.1007/s10973-019-08689-5:Liq
tdb: tdb:GaHo-20Ait.tdb:LIQUID

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

GaHo-20Ait.tdb: LIQUID, type code %, sha256 97e610d6cbfd4c80…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : GA HO : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-019-08689-5 M. Ait Boukideur, N. Selhaoui, F. Z. Chrifi Alaoui, A. Iddaoudi, K. Achgar, S. Kardellass, Thermodynamic assessment of the Ho–Ga system, J Therm Anal Calorim 139, 3623-3633 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase
doi:10.1016/0025-5416(82)90075-1 Joshua Pelleg, G. Kimmel, The HoGa system in the 66.7–100 at.% Ga range, Materials Science and Engineering 52, P1-P7 (1982).
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}
}