# Er–Zn phases

> Er–Zn system: 12 phases (tier A 5, tier C 6, liquid 1); 10 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/ER-ZN.html · Markdown: https://data.orchid-project.org/phases/pages/ER-ZN.md

12 phases (tier A 5, tier C 6, liquid 1); 10 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=ER-ZN) · [full JSON](https://data.orchid-project.org/phases/systems/ER-ZN.json) · [Er–Zn system page](https://data.orchid-project.org/systems/ER-ZN.html) · [Markdown](https://data.orchid-project.org/phases/pages/ER-ZN.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Er–Zn system (12)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-er-zn-bcc-a2); _phase:er-zn:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [ER13ZN58](#phase-er-zn-er13zn58); _phase:er-zn:er13zn58_ | Gd13Zn58 · hP142 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1202.1 K, x(Zn) 0.8169–0.8169 | 0 | 1 |
| [ER2ZN17_HT](#phase-er-zn-er2zn17-ht); _phase:er-zn:er2zn17-ht_ | Th2Zn17 · hR19 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 1024.5–1157.39 K, x(Zn) 0.89474–0.89474 | 0 | 1 |
| [ER2ZN17_LT](#phase-er-zn-er2zn17-lt); _phase:er-zn:er2zn17-lt_ | Ni17Th2 · hP38 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1024.5 K, x(Zn) 0.89474–0.89474 | 0 | 1 |
| [ERZN_B2](#phase-er-zn-erzn-b2); _phase:er-zn:erzn-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1395.67 K, x(Zn) 0.5–0.5 | 0 | 1 |
| [ERZN12_D2B](#phase-er-zn-erzn12-d2b); _phase:er-zn:erzn12-d2b_ | Mn12Th · D2_b · tI26 · I4/mmm (139) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–949.68 K, x(Zn) 0.92308–0.92308 | 0 | 1 |
| [ERZN2](#phase-er-zn-erzn2); _phase:er-zn:erzn2_ | Hg2K · oI12 · Imma (74) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1323.76 K, x(Zn) 0.66667–0.66667 | 0 | 1 |
| [ERZN3](#phase-er-zn-erzn3); _phase:er-zn:erzn3_ | YZn3 · oP16 · Pnma (62) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1188.26 K, x(Zn) 0.75–0.75 | 0 | 1 |
| [ERZN5](#phase-er-zn-erzn5); _phase:er-zn:erzn5_ | ErZn5 · hP36 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1156.23 K, x(Zn) 0.83333–0.83333 | 0 | 1 |
| [FCC_A1](#phase-er-zn-fcc-a1); _phase:er-zn:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [HCP_A3](#phase-er-zn-hcp-a3); _phase:er-zn:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–2498.91 K, x(Zn) 0–1 | 0 | 1 |
| [LIQUID](#phase-er-zn-liquid); _phase:er-zn:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 692.66–2500 K, x(Zn) 0–1 | 0 | 1 |

## BCC_A2 (Er–Zn)

- Id: `phase:er-zn: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](https://orchid-project.org/phases/#phase:er-zn:bcc-a2)

Names (2): _corpus: _corpus:phase:er-zn:bcc-a2  
_tdb: _tdb:ErZn-19Fre.tdb:BCC_A2  


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

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): BCC_A2, type code %B, sha256 `c3cb413bb00d0232…`

~~~~text
30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : ER ZN : VA : !
~~~~

## ER13ZN58 (Er–Zn)

- Id: `phase:er-zn:er13zn58`; status `assigned`
- Structure: Gd13Zn58 · hP142 · P6_3/mmc (194); type `st:gd13zn58-hp142`; 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: Er 0.1831, Zn 0.8169
- Stability: stable in 1 of 1 calculated diagram(s): 300–1202.1 K, x(Zn) 0.8169–0.8169
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:er13zn58)

Names (2): _corpus: _corpus:phase:er-zn:er13zn58  
_tdb: _tdb:ErZn-19Fre.tdb:ER13ZN58  


### TDB models of ER13ZN58 (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ER13ZN58, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
55: PHASE ER13ZN58 % 2 13 58 !
56: CONST ER13ZN58 : ER : ZN : !
~~~~

## ER2ZN17_HT (Er–Zn)

- Id: `phase:er-zn:er2zn17-ht`; status `assigned`
- Structure: Th2Zn17 · hR19 · R-3m (166); type `st:th2zn17-hr19`; 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_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Er 0.1053, Zn 0.8947
- Stability: stable in 1 of 1 calculated diagram(s): 1024.5–1157.39 K, x(Zn) 0.89474–0.89474
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:er2zn17-ht)

Names (2): _corpus: _corpus:phase:er-zn:er2zn17-ht  
_tdb: _tdb:ErZn-19Fre.tdb:ER2ZN17_HT  


### TDB models of ER2ZN17_HT (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ER2ZN17_HT, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
70: PHASE ER2ZN17_HT % 2 2 17 !
71: CONST ER2ZN17_HT : ER : ZN : !
~~~~

## ER2ZN17_LT (Er–Zn)

- Id: `phase:er-zn:er2zn17-lt`; status `assigned`
- Structure: Ni17Th2 · hP38 · P6_3/mmc (194); type `st:ni17th2-hp38`; 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_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Er 0.1053, Zn 0.8947
- Stability: stable in 1 of 1 calculated diagram(s): 300–1024.5 K, x(Zn) 0.89474–0.89474
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:er2zn17-lt)

Names (2): _corpus: _corpus:phase:er-zn:er2zn17-lt  
_tdb: _tdb:ErZn-19Fre.tdb:ER2ZN17_LT  


### TDB models of ER2ZN17_LT (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ER2ZN17_LT, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
65: PHASE ER2ZN17_LT % 2 2 17 !
66: CONST ER2ZN17_LT : ER : ZN : !
~~~~

## ERZN_B2 (Er–Zn)

- Id: `phase:er-zn:erzn-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaaclw and oqmd-89104, space group 221
- Stoichiometry: Er 0.5000, Zn 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1395.67 K, x(Zn) 0.5–0.5
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:erzn-b2)

Names (4): _corpus: _corpus:phase:er-zn:erzn-b2  
_mp: _mp:mp-aaaaaclw  
_oqmd: _oqmd:oqmd-89104  
_tdb: _tdb:ErZn-19Fre.tdb:ERZN_B2  


### TDB models of ERZN_B2 (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ERZN_B2, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
40: PHASE ERZN_B2 % 2 1 1 !
41: CONST ERZN_B2 : ER : ZN : !
~~~~

## ERZN12_D2B (Er–Zn)

- Id: `phase:er-zn:erzn12-d2b`; status `assigned`
- Structure: Mn12Th · D2_b · tI26 · I4/mmm (139); type `st:d2-b-mn12th-ti26`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaabthm and oqmd-30069, space group 139
- Stoichiometry: Er 0.0769, Zn 0.9231
- Stability: stable in 1 of 1 calculated diagram(s): 300–949.68 K, x(Zn) 0.92308–0.92308
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:erzn12-d2b)

Names (4): _corpus: _corpus:phase:er-zn:erzn12-d2b  
_mp: _mp:mp-aaaabthm  
_oqmd: _oqmd:oqmd-30069  
_tdb: _tdb:ErZn-19Fre.tdb:ERZN12_D2B  


### TDB models of ERZN12_D2B (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ERZN12_D2B, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
75: PHASE ERZN12_D2B % 2 1 12 !
76: CONST ERZN12_D2B : ER : ZN : !
~~~~

## ERZN2 (Er–Zn)

- Id: `phase:er-zn:erzn2`; status `assigned`
- Structure: Hg2K · oI12 · Imma (74); type `st:hg2k-oi12`; 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_74_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Er 0.3333, Zn 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1323.76 K, x(Zn) 0.66667–0.66667
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:erzn2)

Names (2): _corpus: _corpus:phase:er-zn:erzn2  
_tdb: _tdb:ErZn-19Fre.tdb:ERZN2  


### TDB models of ERZN2 (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ERZN2, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
45: PHASE ERZN2 % 2 1 2 !
46: CONST ERZN2 : ER : ZN : !
~~~~

## ERZN3 (Er–Zn)

- Id: `phase:er-zn:erzn3`; status `assigned`
- Structure: YZn3 · oP16 · Pnma (62); type `st:yzn3-op16`; 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_62_matches_4_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Er 0.2500, Zn 0.7500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1188.26 K, x(Zn) 0.75–0.75
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:erzn3)

Names (2): _corpus: _corpus:phase:er-zn:erzn3  
_tdb: _tdb:ErZn-19Fre.tdb:ERZN3  


### TDB models of ERZN3 (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ERZN3, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
50: PHASE ERZN3 % 2 1 3 !
51: CONST ERZN3 : ER : ZN : !
~~~~

## ERZN5 (Er–Zn)

- Id: `phase:er-zn:erzn5`; status `assigned`
- Structure: ErZn5 · hP36 · P6_3/mmc (194); type `st:erzn5-hp36`; 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: Er 0.1667, Zn 0.8333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1156.23 K, x(Zn) 0.83333–0.83333
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:erzn5)

Names (2): _corpus: _corpus:phase:er-zn:erzn5  
_tdb: _tdb:ErZn-19Fre.tdb:ERZN5  


### TDB models of ERZN5 (1): PHASE and CONSTITUENT statements as written

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): ERZN5, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
60: PHASE ERZN5 % 2 1 5 !
61: CONST ERZN5 : ER : ZN : !
~~~~

## FCC_A1 (Er–Zn)

- Id: `phase:er-zn:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stoichiometry: Zn 1.0000
- 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:er-zn:fcc-a1)

Names (2): _corpus: _corpus:phase:er-zn:fcc-a1  
_tdb: _tdb:ErZn-19Fre.tdb:FCC_A1  


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

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): FCC_A1, type code %A, sha256 `c3cb413bb00d0232…`

~~~~text
25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : ZN : VA : !
~~~~

## HCP_A3 (Er–Zn)

- Id: `phase:er-zn: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): 300–2498.91 K, x(Zn) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:hcp-a3)

Names (2): _corpus: _corpus:phase:er-zn:hcp-a3  
_tdb: _tdb:ErZn-19Fre.tdb:HCP_A3  


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

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): HCP_A3, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
35: PHASE HCP_A3 % 2 1 0.5 !
36: CONST HCP_A3 : ER% ZN% : VA : !
~~~~

## LIQUID (Er–Zn)

- Id: `phase:er-zn:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 692.66–2500 K, x(Zn) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:er-zn:liquid)

Names (2): _corpus: _corpus:phase:er-zn:liquid  
_tdb: _tdb:ErZn-19Fre.tdb:LIQUID  


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

[ErZn-19Fre.tdb](https://orchid-project.org/data/databases/sgte-binary/ErZn-19Fre.tdb): LIQUID, type code %, sha256 `c3cb413bb00d0232…`

~~~~text
20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : ER ZN : !
~~~~

## 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).