Au–Gd phases

13 phases (tier A 8, tier C 4, liquid 1); 13 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 · Au–Gd system page · Markdown · field reference

Phases of the Au–Gd system (13)
Phase	Structure	Basis	Stability (calculated)	TDB models
AU10GD7 phase:au-gd:au10gd7	Au10Gd7 · tI136 · I4_1/acd (142)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1433.41 K, x(Gd) 0.41176–0.41176	1
AU2GD_C11B phase:au-gd:au2gd-c11b	MoSi2 · C11_b · tI6 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1451.18 K, x(Gd) 0.33333–0.33333	1
AU3GD_D0A phase:au-gd:au3gd-d0a	beta-Cu3Ti · D0_a · oP8 · Pmmn (59)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1472.94 K, x(Gd) 0.25–0.25	1
AU4GD3 phase:au-gd:au4gd3	Pd4Pu3 · hR14 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1613.21 K, x(Gd) 0.42857–0.42857	1
AU51GD14 phase:au-gd:au51gd14	Ag51Gd14 · hP68 · P6/m (175)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1435.94 K, x(Gd) 0.21538–0.21538	1
AU6GD phase:au-gd:au6gd	Au6Sm · tP56 · P4_2/ncm (138)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1129.23 K, x(Gd) 0.14286–0.14286	1
AUGD_B2 phase:au-gd:augd-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1748.16–1858.16 K, x(Gd) 0.5–0.5	1
AUGD_B33 phase:au-gd:augd-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1748.16 K, x(Gd) 0.5–0.5	1
AUGD2_C37 phase:au-gd:augd2-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1207.25 K, x(Gd) 0.66667–0.66667	1
BCC_A2 phase:au-gd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1494.41–2499.85 K, x(Gd) 0.99553–1	1
FCC_A1 phase:au-gd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1340.07 K, x(Gd) 0–0.00698	1
HCP_A3 phase:au-gd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1583.15 K, x(Gd) 0.99325–1	1
LIQUID phase:au-gd:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1075.07–2500 K, x(Gd) 0–1	1

AU10GD7 (Au–Gd)

Id: phase:au-gd:au10gd7; status assigned
Structure: Au10Gd7 · tI136 · I4_1/acd (142); type st:au10gd7-ti136; 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: Au 0.5882, Gd 0.4118
Stability: stable in 1 of 1 calculated diagram(s): 300–1433.41 K, x(Gd) 0.41176–0.41176
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au10gd7
tdb: tdb:AuGd-16Wan.tdb:AU10GD7

TDB models of AU10GD7 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU10GD7, type code %, sha256 062468fc265b53d7…

66: PHASE AU10GD7 % 2 10 7 !
67: CONST AU10GD7 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AU2GD_C11B (Au–Gd)

Id: phase:au-gd:au2gd-c11b; status assigned
Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type st:c11-b-mosi2-ti6; tier A: standard phase name; confidence high
Stoichiometry: Au 0.6667, Gd 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1451.18 K, x(Gd) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au2gd-c11b
tdb: tdb:AuGd-16Wan.tdb:AU2GD_C11B

TDB models of AU2GD_C11B (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU2GD_C11B, type code %, sha256 062468fc265b53d7…

61: PHASE AU2GD_C11B % 2 2 1 !
62: CONST AU2GD_C11B : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AU3GD_D0A (Au–Gd)

Id: phase:au-gd:au3gd-d0a; status assigned
Structure: beta-Cu3Ti · D0_a · oP8 · Pmmn (59); type st:d0-a-beta-cu3ti-op8; tier A: standard phase name; confidence high
Stoichiometry: Au 0.7500, Gd 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1472.94 K, x(Gd) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au3gd-d0a
tdb: tdb:AuGd-16Wan.tdb:AU3GD_D0A

TDB models of AU3GD_D0A (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU3GD_D0A, type code %, sha256 062468fc265b53d7…

56: PHASE AU3GD_D0A % 2 3 1 !
57: CONST AU3GD_D0A : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AU4GD3 (Au–Gd)

Id: phase:au-gd:au4gd3; status assigned
Structure: Pd4Pu3 · hR14 · R-3 (148); type st:pd4pu3-hr14; 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: Au 0.5714, Gd 0.4286
Stability: stable in 1 of 1 calculated diagram(s): 300–1613.21 K, x(Gd) 0.42857–0.42857
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au4gd3
tdb: tdb:AuGd-16Wan.tdb:AU4GD3

TDB models of AU4GD3 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU4GD3, type code %, sha256 062468fc265b53d7…

71: PHASE AU4GD3 % 2 4 3 !
72: CONST AU4GD3 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AU51GD14 (Au–Gd)

Id: phase:au-gd:au51gd14; status assigned
Structure: Ag51Gd14 · hP68 · P6/m (175); type st:ag51gd14-hp68; 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: Au 0.7846, Gd 0.2154
Stability: stable in 1 of 1 calculated diagram(s): 300–1435.94 K, x(Gd) 0.21538–0.21538
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au51gd14
tdb: tdb:AuGd-16Wan.tdb:AU51GD14

TDB models of AU51GD14 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU51GD14, type code %, sha256 062468fc265b53d7…

51: PHASE AU51GD14 % 2 51 14 !
52: CONST AU51GD14 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AU6GD (Au–Gd)

Id: phase:au-gd:au6gd; status assigned
Structure: Au6Sm · tP56 · P4_2/ncm (138); type st:au6sm-tp56; 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: Au 0.8571, Gd 0.1429
Stability: stable in 1 of 1 calculated diagram(s): 300–1129.23 K, x(Gd) 0.14286–0.14286
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:au6gd
tdb: tdb:AuGd-16Wan.tdb:AU6GD

TDB models of AU6GD (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AU6GD, type code %, sha256 062468fc265b53d7…

46: PHASE AU6GD % 2 6 1 !
47: CONST AU6GD : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AUGD_B2 (Au–Gd)

Id: phase:au-gd:augd-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stoichiometry: Au 0.5000, Gd 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 1748.16–1858.16 K, x(Gd) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:augd-b2
tdb: tdb:AuGd-16Wan.tdb:AUGD_B2

TDB models of AUGD_B2 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AUGD_B2, type code %, sha256 062468fc265b53d7…

81: PHASE AUGD_B2 % 2 1 1 !
82: CONST AUGD_B2 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AUGD_B33 (Au–Gd)

Id: phase:au-gd:augd-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Stoichiometry: Au 0.5000, Gd 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1748.16 K, x(Gd) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:augd-b33
tdb: tdb:AuGd-16Wan.tdb:AUGD_B33

TDB models of AUGD_B33 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AUGD_B33, type code %, sha256 062468fc265b53d7…

76: PHASE AUGD_B33 % 2 1 1 !
77: CONST AUGD_B33 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

AUGD2_C37 (Au–Gd)

Id: phase:au-gd:augd2-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Stoichiometry: Au 0.3333, Gd 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1207.25 K, x(Gd) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:augd2-c37
tdb: tdb:AuGd-16Wan.tdb:AUGD2_C37

TDB models of AUGD2_C37 (1): PHASE and CONSTITUENT statements as written

AuGd-16Wan.tdb: AUGD2_C37, type code %, sha256 062468fc265b53d7…

86: PHASE AUGD2_C37 % 2 1 2 !
87: CONST AUGD2_C37 : AU : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

BCC_A2 (Au–Gd)

Id: phase:au-gd: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): 1494.41–2499.85 K, x(Gd) 0.99553–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:bcc-a2
tdb: tdb:AuGd-16Wan.tdb:BCC_A2

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

AuGd-16Wan.tdb: BCC_A2, type code %B, sha256 062468fc265b53d7…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : AU GD% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

FCC_A1 (Au–Gd)

Id: phase:au-gd: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): 300–1340.07 K, x(Gd) 0–0.00698
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:fcc-a1
tdb: tdb:AuGd-16Wan.tdb:FCC_A1

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

AuGd-16Wan.tdb: FCC_A1, type code %A, sha256 062468fc265b53d7…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : AU% GD : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

HCP_A3 (Au–Gd)

Id: phase:au-gd: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): 300–1583.15 K, x(Gd) 0.99325–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:hcp-a3
tdb: tdb:AuGd-16Wan.tdb:HCP_A3

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

AuGd-16Wan.tdb: HCP_A3, type code %A, sha256 062468fc265b53d7…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : AU GD% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
assessment that models this phase

LIQUID (Au–Gd)

Id: phase:au-gd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1075.07–2500 K, x(Gd) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:au-gd:liquid
tdb: tdb:AuGd-16Wan.tdb:LIQUID

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

AuGd-16Wan.tdb: LIQUID, type code %, sha256 062468fc265b53d7…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : AU GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2016.02.002 S.L. Wang, L.J. Zhou, X. Qin, Y.H. Li, J.L. Li, Y. Pan, Y.H. Lin, C.P. Wang, X.J. Liu, Calphad, 53, 90-96(2016).
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}
}