# Au–Hf phases

> Au–Hf system: 12 phases (tier A 6, tier C 3, liquid 1, needs_review 2); 12 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-HF.html · Markdown: https://data.orchid-project.org/phases/pages/AU-HF.md

12 phases (tier A 6, tier C 3, liquid 1, needs_review 2); 12 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-HF) · [full JSON](https://data.orchid-project.org/phases/systems/AU-HF.json) · [Au–Hf system page](https://data.orchid-project.org/systems/AU-HF.html) · [Markdown](https://data.orchid-project.org/phases/pages/AU-HF.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Au–Hf system (12)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [AU10HF7](#phase-au-hf-au10hf7); _phase:au-hf:au10hf7_ | Ni10Zr7 · oC68 · Cmce (64) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1785.98 K, x(Hf) 0.41176–0.41176 | 4 | 1 |
| [AU2HF_C11B](#phase-au-hf-au2hf-c11b); _phase:au-hf:au2hf-c11b_ | MoSi2 · C11_b · tI6 · I4/mmm (139) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1926.8 K, x(Hf) 0.29302–0.33333 | 8 | 1 |
| [AU3HF_D0A](#phase-au-hf-au3hf-d0a); _phase:au-hf:au3hf-d0a_ | beta-Cu3Ti · D0_a · oP8 · Pmmn (59) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1815.44 K, x(Hf) 0.25–0.25 | 4 | 1 |
| [AU4HF](#phase-au-hf-au4hf); _phase:au-hf:au4hf_ | Au4Zr · oP20 · Pnma (62) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1570.94 K, x(Hf) 0.2–0.2 | 4 | 1 |
| [AU5HF_D1A](#phase-au-hf-au5hf-d1a); _phase:au-hf:au5hf-d1a_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1418.11 K, x(Hf) 0.14625–0.16667 | 4 | 1 |
| [AUHF_B11](#phase-au-hf-auhf-b11); _phase:au-hf:auhf-b11_ | CuTi-gamma · B11 · tP4 · P4/nmm (129) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1386.92 K, x(Hf) 0.47532–0.5 | 4 | 1 |
| [AUHF_BETA](#phase-au-hf-auhf-beta); _phase:au-hf:auhf-beta_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 1303.96–4000 K, x(Hf) 0–0.49993 | 12 | 1 |
| [AUHF2](#phase-au-hf-auhf2); _phase:au-hf:auhf2_ | CuZr2 · tI6 · I4/mmm (139) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1793.02 K, x(Hf) 0.66667–0.66667 | 10 | 1 |
| [BCC_A2](#phase-au-hf-bcc-a2); _phase:au-hf:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1559.13–3999.68 K, x(Hf) 0.87087–1 | 4 | 1 |
| [FCC_A1](#phase-au-hf-fcc-a1); _phase:au-hf:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1373.06 K, x(Hf) 0–0.09286 | 2 | 1 |
| [HCP_A3](#phase-au-hf-hcp-a3); _phase:au-hf:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–2504.13 K, x(Hf) 0.97148–1 | 2 | 1 |
| [LIQUID](#phase-au-hf-liquid); _phase:au-hf:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1337.33–4000 K, x(Hf) 0–1 | 20 | 1 |

## AU10HF7 (Au–Hf)

- Id: `phase:au-hf:au10hf7`; status `assigned`
- Structure: Ni10Zr7 · oC68 · Cmce (64); type `st:ni10zr7-oc68`; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.5882, Hf 0.4118
- Stability: stable in 1 of 1 calculated diagram(s): 300–1785.98 K, x(Hf) 0.41176–0.41176
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:au10hf7)

Names (3): _corpus: _corpus:phase:au-hf:au10hf7  
_paper: _paper:10.1016/s0925-8388(02)01293-8:Au10Hf7  
_tdb: _tdb:AuHf-03Du-LB.tdb:AU10HF7  


### TDB models of AU10HF7 (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AU10HF7, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
67: PHASE AU10HF7 % 2 10 7 !
68: CONST AU10HF7 : AU : HF : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AU2HF_C11B (Au–Hf)

- Id: `phase:au-hf:au2hf-c11b`; status `assigned`
- Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type `st:c11-b-mosi2-ti6`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1926.8 K, x(Hf) 0.29302–0.33333
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:au2hf-c11b)

Names (3): _corpus: _corpus:phase:au-hf:au2hf-c11b  
_paper: _paper:10.1016/s0925-8388(02)01293-8:Au2Hf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AU2HF_C11B  


### TDB models of AU2HF_C11B (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AU2HF_C11B, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
62: PHASE AU2HF_C11B % 2 2 1 !
63: CONST AU2HF_C11B : AU : AU HF% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AU3HF_D0A (Au–Hf)

- Id: `phase:au-hf:au3hf-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
- Caveat: DFT agrees: on-hull mp-aaacjkpk and oqmd-28169, space group 59
- Stoichiometry: Au 0.7500, Hf 0.2500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1815.44 K, x(Hf) 0.25–0.25
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:au3hf-d0a)

Names (5): _corpus: _corpus:phase:au-hf:au3hf-d0a  
_mp: _mp:mp-aaacjkpk  
_oqmd: _oqmd:oqmd-28169  
_paper: _paper:10.1016/s0925-8388(02)01293-8:Au3Hf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AU3HF_D0A  


### TDB models of AU3HF_D0A (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AU3HF_D0A, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
57: PHASE AU3HF_D0A % 2 3 1 !
58: CONST AU3HF_D0A : AU : HF : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AU4HF (Au–Hf)

- Id: `phase:au-hf:au4hf`; status `assigned`
- Structure: Au4Zr · oP20 · Pnma (62); type `st:au4zr-op20`; 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 0.8000, Hf 0.2000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1570.94 K, x(Hf) 0.2–0.2
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:au4hf)

Names (3): _corpus: _corpus:phase:au-hf:au4hf  
_paper: _paper:10.1016/s0925-8388(02)01293-8:Au4Hf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AU4HF  


### TDB models of AU4HF (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AU4HF, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
52: PHASE AU4HF % 2 4 1 !
53: CONST AU4HF : AU : HF : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AU5HF_D1A (Au–Hf)

- Id: `phase:au-hf:au5hf-d1a`; status `needs_review`
- No structure assigned. Why: assessment_declared_blocked_by:site_ratios_contradict_D1_a; site_ratios_contradict_D1_a:AuHf-03Du-LB.tdb
- Candidate (literature_printed): MoNi4 · tI10 — printed with a label mapped to this phase
- Candidate (name_token): MoNi4 · D1_a · tI10 · I4/m (87) — Strukturbericht/word 'D1A' in the TDB name
- Candidate (sgte_mmc2): MoNi4 · D1_a · tI10 · I4/m (87) — Hallstedt 2025 mmc2 row for AU5HF_D1A: Au5Hf
- Candidate (tdb_comment): MoNi4 · tI10 · I4/m — AuHf-03Du-LB.tdb: 'Prototype MoNi4 (tI10, I4/m)'
- Stability: stable in 1 of 1 calculated diagram(s): 300–1418.11 K, x(Hf) 0.14625–0.16667
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:au5hf-d1a)

Names (3): _corpus: _corpus:phase:au-hf:au5hf-d1a  
_paper: _paper:10.1016/s0925-8388(02)01293-8:Au5Hf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AU5HF_D1A  


### TDB models of AU5HF_D1A (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AU5HF_D1A, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
47: PHASE AU5HF_D1A % 2 5 1 !
48: CONST AU5HF_D1A : AU : AU HF% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AUHF_B11 (Au–Hf)

- Id: `phase:au-hf:auhf-b11`; status `assigned`
- Structure: CuTi-gamma · B11 · tP4 · P4/nmm (129); type `st:b11-cuti-gamma-tp4`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1386.92 K, x(Hf) 0.47532–0.5
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:auhf-b11)

Names (3): _corpus: _corpus:phase:au-hf:auhf-b11  
_paper: _paper:10.1016/s0925-8388(02)01293-8:αAuHf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AUHF_B11  


### TDB models of AUHF_B11 (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AUHF_B11, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
72: PHASE AUHF_B11 % 2 1 1 !
73: CONST AUHF_B11 : AU : AU HF% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AUHF_BETA (Au–Hf)

- Id: `phase:au-hf:auhf-beta`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (dft_mp): Cmce (64) — on-hull MP Hf7Au10 at x(HF)=0.4118
- Candidate (dft_mp): I4/mmm (139) — on-hull MP HfAu2 at x(HF)=0.3333
- Candidate (dft_mp): Pmmn (59) — on-hull MP HfAu3 at x(HF)=0.2500
- Candidate (dft_oqmd): I4/mmm (139) — on-hull OQMD Au2 Hf1 at x(HF)=0.3333
- Candidate (dft_oqmd): Pmmn (59) — on-hull OQMD Au3 Hf1 at x(HF)=0.2500
- Candidate (dft_oqmd): Pnma (62) — on-hull OQMD Au4 Hf1 at x(HF)=0.2000
- Candidate (dft_oqmd): I4/mmm (139) — on-hull OQMD Au4 Hf3 at x(HF)=0.4286
- Candidate (sgte_mmc2): (AuHf-beta) — Hallstedt 2025 mmc2 row for AUHF_BETA: AuHf-beta
- Stability: stable in 1 of 1 calculated diagram(s): 1303.96–4000 K, x(Hf) 0–0.49993
- Literature: 12 values (12 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:auhf-beta)

Names (3): _corpus: _corpus:phase:au-hf:auhf-beta  
_paper: _paper:10.1016/s0925-8388(02)01293-8:βAuHf  
_tdb: _tdb:AuHf-03Du-LB.tdb:AUHF_BETA  


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

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AUHF_BETA, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
77: PHASE AUHF_BETA % 2 1 1 !
78: CONST AUHF_BETA : AU : AU HF% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## AUHF2 (Au–Hf)

- Id: `phase:au-hf:auhf2`; status `assigned`
- Structure: CuZr2 · tI6 · I4/mmm (139); type `st:cuzr2-ti6`; 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 (dft_space_group_139_matches_5_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.3333, Hf 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1793.02 K, x(Hf) 0.66667–0.66667
- Literature: 10 values (10 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:auhf2)

Names (3): _corpus: _corpus:phase:au-hf:auhf2  
_paper: _paper:10.1016/s0925-8388(02)01293-8:AuHf2  
_tdb: _tdb:AuHf-03Du-LB.tdb:AUHF2  


### TDB models of AUHF2 (1): PHASE and CONSTITUENT statements as written

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): AUHF2, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
82: PHASE AUHF2 % 2 1 2 !
83: CONST AUHF2 : AU : HF : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## BCC_A2 (Au–Hf)

- Id: `phase:au-hf: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): 1559.13–3999.68 K, x(Hf) 0.87087–1
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:bcc-a2)

Names (3): _corpus: _corpus:phase:au-hf:bcc-a2  
_paper: _paper:10.1016/s0925-8388(02)01293-8:bcc(Hf)  
_tdb: _tdb:AuHf-03Du-LB.tdb:BCC_A2  


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

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): BCC_A2, type code %B, sha256 `3f1b621c7e2af58a…`

~~~~text
37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : AU HF% : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## FCC_A1 (Au–Hf)

- Id: `phase:au-hf: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): 300–1373.06 K, x(Hf) 0–0.09286
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:fcc-a1)

Names (3): _corpus: _corpus:phase:au-hf:fcc-a1  
_paper: _paper:10.1016/s0925-8388(02)01293-8:fcc(Au)  
_tdb: _tdb:AuHf-03Du-LB.tdb:FCC_A1  


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

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): FCC_A1, type code %A, sha256 `3f1b621c7e2af58a…`

~~~~text
32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : AU% HF : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## HCP_A3 (Au–Hf)

- Id: `phase:au-hf: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): 300–2504.13 K, x(Hf) 0.97148–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:hcp-a3)

Names (3): _corpus: _corpus:phase:au-hf:hcp-a3  
_paper: _paper:10.1016/s0925-8388(02)01293-8:hcp(Hf)  
_tdb: _tdb:AuHf-03Du-LB.tdb:HCP_A3  


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

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): HCP_A3, type code %A, sha256 `3f1b621c7e2af58a…`

~~~~text
42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : AU HF% : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_cited as the source of values for this phase_

## LIQUID (Au–Hf)

- Id: `phase:au-hf:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1337.33–4000 K, x(Hf) 0–1
- Literature: 20 values (20 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-hf:liquid)

Names (3): _corpus: _corpus:phase:au-hf:liquid  
_paper: _paper:10.1016/s0925-8388(02)01293-8:liq.  
_tdb: _tdb:AuHf-03Du-LB.tdb:LIQUID  


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

[AuHf-03Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AuHf-03Du-LB.tdb): LIQUID, type code %, sha256 `3f1b621c7e2af58a…`

~~~~text
27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : AU HF : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(02)01293-8](https://doi.org/10.1016/S0925-8388%2802%2901293-8) Z. Du, L. Yang, J. Alloys Compd., 353, 213-16(2003).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(99)00529-0](https://doi.org/10.1016/s0925-8388%2899%2900529-0) M Lomello-Tafin, Ph Galez, P Feschotte, J.L Jorda, The Hf–Au system, Journal of Alloys and Compounds 296, 103-111 (2000).  
_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). 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).