# Fe–Ga phases

> Fe–Ga system: 9 phases (tier A 4, tier B 1, tier C 1, liquid 1, needs_review 2); 8 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/FE-GA.html · Markdown: https://data.orchid-project.org/phases/pages/FE-GA.md

9 phases (tier A 4, tier B 1, tier C 1, liquid 1, needs_review 2); 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](https://orchid-project.org/phases/?q=FE-GA) · [full JSON](https://data.orchid-project.org/phases/systems/FE-GA.json) · [Fe–Ga system page](https://data.orchid-project.org/systems/FE-GA.html) · [Markdown](https://data.orchid-project.org/phases/pages/FE-GA.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Fe–Ga system (9)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [ORTHORHOMBIC_A11](#phase-fe-ga-a11-orthorhombic); _phase:fe-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 | 0 | 1 |
| [BCC_A2](#phase-fe-ga-bcc-a2); _phase:fe-ga:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1810.95 K, x(Ga) 0–0.53184 | 0 | 1 |
| [FCC_A1](#phase-fe-ga-fcc-a1); _phase:fe-ga:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1167.81–1679.81 K, x(Ga) 0–0.02726 | 0 | 1 |
| [FE3GA](#phase-fe-ga-fe3ga); _phase:fe-ga:fe3ga_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–957.53 K, x(Ga) 0.25–0.25 | 0 | 1 |
| [FE3GA4](#phase-fe-ga-fe3ga4); _phase:fe-ga:fe3ga4_ | Fe3Ga4 · mC42 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1207.82 K, x(Ga) 0.57143–0.57143 | 0 | 1 |
| [FE6GA5](#phase-fe-ga-fe6ga5); _phase:fe-ga:fe6ga5_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1064.21 K, x(Ga) 0.45455–0.45455 | 0 | 1 |
| [FEGA3](#phase-fe-ga-fega3); _phase:fe-ga:fega3_ | In3Ir · tP16 · P4_2/mnm (136) | tier B: DFT-supported (unique MP + OQMD match) | stable in 1 of 1 calculated diagram(s): 300–1092.89 K, x(Ga) 0.75–0.75 | 0 | 1 |
| [HCP_A3](#phase-fe-ga-hcp-a3); _phase:fe-ga:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [LIQUID](#phase-fe-ga-liquid); _phase:fe-ga:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Ga) 0–1 | 0 | 1 |

## ORTHORHOMBIC_A11 (Fe–Ga)

- Id: `phase:fe-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](https://orchid-project.org/phases/#phase:fe-ga:a11-orthorhombic)

Names (2): _corpus: _corpus:phase:fe-ga:a11-orthorhombic  
_tdb: _tdb:FeGa-04Tur.tdb:ORTHORHOMBIC_A11  


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

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): ORTHORHOMBIC_A11, type code %, sha256 `a83660c514336416…`

~~~~text
43: PHASE ORTHORHOMBIC_A11 % 1 1 !
44: CONST ORTHORHOMBIC_A11 : GA : !
~~~~

## BCC_A2 (Fe–Ga)

- Id: `phase:fe-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): 300–1810.95 K, x(Ga) 0–0.53184
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:bcc-a2)

Names (2): _corpus: _corpus:phase:fe-ga:bcc-a2  
_tdb: _tdb:FeGa-04Tur.tdb:BCC_A2  


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

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): BCC_A2, type code %B, sha256 `a83660c514336416…`

~~~~text
33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : FE% GA : VA : !
~~~~

## FCC_A1 (Fe–Ga)

- Id: `phase:fe-ga: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): 1167.81–1679.81 K, x(Ga) 0–0.02726
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:fcc-a1)

Names (2): _corpus: _corpus:phase:fe-ga:fcc-a1  
_tdb: _tdb:FeGa-04Tur.tdb:FCC_A1  


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

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): FCC_A1, type code %A, sha256 `a83660c514336416…`

~~~~text
28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : FE% GA : VA : !
~~~~

## FE3GA (Fe–Ga)

- Id: `phase:fe-ga:fe3ga`; status `needs_review`
- No structure assigned. Why: no_structure_token; sgte_mmc2_row_disagrees_with_dft; sgte_mmc2_rows_disagree
- Candidate (dft_mp): Pm-3m (221) — on-hull MP GaFe3 at x(GA)=0.2500
- Candidate (dft_oqmd): Pm-3m (221) — on-hull OQMD Fe3 Ga1 at x(GA)=0.2500
- Candidate (sgte_mmc2): Ni3Sn · D0_19 · hP8 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for FE3GA: Fe3Ga (high T)
- Candidate (sgte_mmc2): BiF3 · D0_3 · cF16 · Fm-3m (225) — Hallstedt 2025 mmc2 row for FE3GA: Fe3Ga (high T, Fe-rich)
- Candidate (sgte_mmc2): AuCu3 · L1_2 · cP4 · Pm-3m (221) — Hallstedt 2025 mmc2 row for FE3GA: Fe3Ga (low T)
- Candidate (tdb_comment): AuCu3 · cP4 · Pm-3m — FeGa-04Tur.tdb: 'Prototype AuCu3 (cP4, Pm-3m), L1_2, low T'
- Candidate (tdb_comment): BiF3 · cF16 · Fm-3m — FeGa-04Tur.tdb: 'Prototype BiF3 (cF16, Fm-3m), D0_3, high T Fe-rich'
- Candidate (tdb_comment): CdMg3 · hP8 · P6_3/mmc — FeGa-04Tur.tdb: 'Prototype CdMg3 (hP8, P6_3/mmc), D0_19, high T'
- Stoichiometry: Fe 0.7500, Ga 0.2500
- Stability: stable in 1 of 1 calculated diagram(s): 300–957.53 K, x(Ga) 0.25–0.25
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:fe3ga)

Names (2): _corpus: _corpus:phase:fe-ga:fe3ga  
_tdb: _tdb:FeGa-04Tur.tdb:FE3GA  


### TDB models of FE3GA (1): PHASE and CONSTITUENT statements as written

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): FE3GA, type code %, sha256 `a83660c514336416…`

~~~~text
50: PHASE FE3GA % 2 3 1 !
51: CONST FE3GA : FE : GA : !
~~~~

## FE3GA4 (Fe–Ga)

- Id: `phase:fe-ga:fe3ga4`; status `assigned`
- Structure: Fe3Ga4 · mC42 · C2/m (12); type `st:fe3ga4-mc42`; 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: Fe 0.4286, Ga 0.5714
- Stability: stable in 1 of 1 calculated diagram(s): 300–1207.82 K, x(Ga) 0.57143–0.57143
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:fe3ga4)

Names (2): _corpus: _corpus:phase:fe-ga:fe3ga4  
_tdb: _tdb:FeGa-04Tur.tdb:FE3GA4  


### TDB models of FE3GA4 (1): PHASE and CONSTITUENT statements as written

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): FE3GA4, type code %, sha256 `a83660c514336416…`

~~~~text
61: PHASE FE3GA4 % 2 3 4 !
62: CONST FE3GA4 : FE : GA : !
~~~~

## FE6GA5 (Fe–Ga)

- Id: `phase:fe-ga:fe6ga5`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_rows_disagree
- Candidate (sgte_mmc2): Fe6Ga5 · mC44 · C2/m (12) — Hallstedt 2025 mmc2 row for FE6GA5: Fe6Ga5 (low T)
- Candidate (sgte_mmc2): GaMn · hR26 · R-3m (166) — Hallstedt 2025 mmc2 row for FE6GA5: Fe6Ga5 (high T)
- Candidate (tdb_comment): Fe6Ga5 · mC44 · C2/m — FeGa-04Tur.tdb: 'Prototype Fe6Ga5 (mC44, C2/m), low T'
- Candidate (tdb_comment): GaMn · hR26 · R-3m — FeGa-04Tur.tdb: 'Prototype GaMn (hR26, R-3m), high T'
- Stoichiometry: Fe 0.5455, Ga 0.4545
- Stability: stable in 1 of 1 calculated diagram(s): 300–1064.21 K, x(Ga) 0.45455–0.45455
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:fe6ga5)

Names (2): _corpus: _corpus:phase:fe-ga:fe6ga5  
_tdb: _tdb:FeGa-04Tur.tdb:FE6GA5  


### TDB models of FE6GA5 (1): PHASE and CONSTITUENT statements as written

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): FE6GA5, type code %, sha256 `a83660c514336416…`

~~~~text
56: PHASE FE6GA5 % 2 6 5 !
57: CONST FE6GA5 : FE : GA : !
~~~~

## FEGA3 (Fe–Ga)

- Id: `phase:fe-ga:fega3`; status `assigned`
- Structure: In3Ir · tP16 · P4_2/mnm (136); type `st:in3ir-tp16`; tier B: DFT-supported (unique MP + OQMD match); confidence high
- Stoichiometry: Fe 0.2500, Ga 0.7500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1092.89 K, x(Ga) 0.75–0.75
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:fega3)

Names (4): _corpus: _corpus:phase:fe-ga:fega3  
_mp: _mp:mp-aaabkfjs  
_oqmd: _oqmd:oqmd-30160  
_tdb: _tdb:FeGa-04Tur.tdb:FEGA3  


### TDB models of FEGA3 (1): PHASE and CONSTITUENT statements as written

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): FEGA3, type code %, sha256 `a83660c514336416…`

~~~~text
66: PHASE FEGA3 % 2 1 3 !
67: CONST FEGA3 : FE : GA : !
~~~~

## HCP_A3 (Fe–Ga)

- Id: `phase:fe-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
- Stability: not stable in 1 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-ga:hcp-a3)

Names (2): _corpus: _corpus:phase:fe-ga:hcp-a3  
_tdb: _tdb:FeGa-04Tur.tdb:HCP_A3  


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

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): HCP_A3, type code %A, sha256 `a83660c514336416…`

~~~~text
38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : FE GA : VA : !
~~~~

## LIQUID (Fe–Ga)

- Id: `phase:fe-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](https://orchid-project.org/phases/#phase:fe-ga:liquid)

Names (2): _corpus: _corpus:phase:fe-ga:liquid  
_tdb: _tdb:FeGa-04Tur.tdb:LIQUID  


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

[FeGa-04Tur.tdb](https://orchid-project.org/data/databases/sgte-binary/FeGa-04Tur.tdb): LIQUID, type code %, sha256 `a83660c514336416…`

~~~~text
23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : FE GA : !
~~~~

## 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).