# Au–Gd phases

> Au–Gd system: 13 phases (tier A 8, tier C 4, liquid 1); 13 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

HTML: https://data.orchid-project.org/phases/pages/AU-GD.html · Markdown: https://data.orchid-project.org/phases/pages/AU-GD.md

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](https://orchid-project.org/phases/?q=AU-GD) · [full JSON](https://data.orchid-project.org/phases/systems/AU-GD.json) · [Au–Gd system page](https://data.orchid-project.org/systems/AU-GD.html) · [Markdown](https://data.orchid-project.org/phases/pages/AU-GD.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Au–Gd system (13)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [AU10GD7](#phase-au-gd-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 | 0 | 1 |
| [AU2GD_C11B](#phase-au-gd-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 | 0 | 1 |
| [AU3GD_D0A](#phase-au-gd-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 | 0 | 1 |
| [AU4GD3](#phase-au-gd-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 | 0 | 1 |
| [AU51GD14](#phase-au-gd-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 | 0 | 1 |
| [AU6GD](#phase-au-gd-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 | 0 | 1 |
| [AUGD_B2](#phase-au-gd-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 | 0 | 1 |
| [AUGD_B33](#phase-au-gd-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 | 0 | 1 |
| [AUGD2_C37](#phase-au-gd-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 | 0 | 1 |
| [BCC_A2](#phase-au-gd-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 | 0 | 1 |
| [FCC_A1](#phase-au-gd-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 | 0 | 1 |
| [HCP_A3](#phase-au-gd-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 | 0 | 1 |
| [LIQUID](#phase-au-gd-liquid); _phase:au-gd:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1075.07–2500 K, x(Gd) 0–1 | 0 | 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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au10gd7)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU10GD7, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au2gd-c11b)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU2GD_C11B, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au3gd-d0a)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU3GD_D0A, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au4gd3)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU4GD3, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au51gd14)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU51GD14, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:au6gd)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AU6GD, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:augd-b2)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AUGD_B2, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:augd-b33)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AUGD_B33, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:augd2-c37)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): AUGD2_C37, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:bcc-a2)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): BCC_A2, type code %B, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:fcc-a1)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): FCC_A1, type code %A, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:hcp-a3)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): HCP_A3, type code %A, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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](https://orchid-project.org/phases/#phase:au-gd:liquid)

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](https://orchid-project.org/data/databases/sgte-binary/AuGd-16Wan.tdb): LIQUID, type code %, sha256 `062468fc265b53d7…`

~~~~text
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](https://doi.org/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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).