# Th–Zn phases

> Th–Zn system: 8 phases (tier A 5, tier B 1, liquid 1, needs_review 1); 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/TH-ZN.html · Markdown: https://data.orchid-project.org/phases/pages/TH-ZN.md

8 phases (tier A 5, tier B 1, liquid 1, needs_review 1); 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=TH-ZN) · [full JSON](https://data.orchid-project.org/phases/systems/TH-ZN.json) · [Th–Zn system page](https://data.orchid-project.org/systems/TH-ZN.html) · [Markdown](https://data.orchid-project.org/phases/pages/TH-ZN.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Th–Zn system (8)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-th-zn-bcc-a2); _phase:th-zn:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1631.66–2051.99 K, x(Zn) 0–0.00228 | 2 | 1 |
| [FCC_A1](#phase-th-zn-fcc-a1); _phase:th-zn:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1633.19 K, x(Zn) 0–0.00197 | 4 | 1 |
| [HCP_A3](#phase-th-zn-hcp-a3); _phase:th-zn:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–3998.92 K, x(Zn) 1–1 | 2 | 1 |
| [LIQUID](#phase-th-zn-liquid); _phase:th-zn:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 692.67–4000 K, x(Zn) 0–1 | 20 | 1 |
| [TH2ZN_C16](#phase-th-zn-th2zn-c16); _phase:th-zn:th2zn-c16_ | Al2Cu · C16 · tI12 · I4/mcm (140) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1323.21 K, x(Zn) 0.33333–0.33333 | 6 | 1 |
| [TH2ZN17](#phase-th-zn-th2zn17); _phase:th-zn:th2zn17_ | Th2Zn17 · hR19 · R-3m (166) | tier B: DFT-supported (unique MP + OQMD match) | stable in 1 of 1 calculated diagram(s): 300–1286.03 K, x(Zn) 0.89474–0.89474 | 8 | 1 |
| [THZN2](#phase-th-zn-thzn2); _phase:th-zn:thzn2_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1375.5 K, x(Zn) 0.66667–0.66667 | 10 | 1 |
| [THZN4_D13](#phase-th-zn-thzn4-d13); _phase:th-zn:thzn4-d13_ | Al4Ba · D1_3 · tI10 · I4/mmm (139) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1372.11 K, x(Zn) 0.8–0.8 | 6 | 1 |

## BCC_A2 (Th–Zn)

- Id: `phase:th-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: stable in 1 of 1 calculated diagram(s): 1631.66–2051.99 K, x(Zn) 0–0.00228
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:bcc-a2)

Names (3): _corpus: _corpus:phase:th-zn:bcc-a2  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:βTh  
_tdb: _tdb:ThZn-10Li.tdb:BCC_A2  


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

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): BCC_A2, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
37: PHASE BCC_A2 % 2 1 3 !
38: CONST BCC_A2 : TH% ZN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## FCC_A1 (Th–Zn)

- Id: `phase:th-zn: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): 300–1633.19 K, x(Zn) 0–0.00197
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:fcc-a1)

Names (3): _corpus: _corpus:phase:th-zn:fcc-a1  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:αTh  
_tdb: _tdb:ThZn-10Li.tdb:FCC_A1  


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

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): FCC_A1, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
32: PHASE FCC_A1 % 2 1 1 !
33: CONST FCC_A1 : TH% ZN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## HCP_A3 (Th–Zn)

- Id: `phase:th-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
- Stoichiometry: Zn 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 300–3998.92 K, x(Zn) 1–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:hcp-a3)

Names (3): _corpus: _corpus:phase:th-zn:hcp-a3  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:(Zn)  
_tdb: _tdb:ThZn-10Li.tdb:HCP_A3  


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

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): HCP_A3, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
42: PHASE HCP_A3 % 2 1 0.5 !
43: CONST HCP_A3 : ZN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## LIQUID (Th–Zn)

- Id: `phase:th-zn:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 692.67–4000 K, x(Zn) 0–1
- Literature: 20 values (20 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:liquid)

Names (3): _corpus: _corpus:phase:th-zn:liquid  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:L  
_tdb: _tdb:ThZn-10Li.tdb:LIQUID  


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

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): LIQUID, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : TH ZN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## TH2ZN_C16 (Th–Zn)

- Id: `phase:th-zn:th2zn-c16`; status `assigned`
- Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type `st:c16-al2cu-ti12`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaadnv and oqmd-31107, space group 140
- Stoichiometry: Th 0.6667, Zn 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1323.21 K, x(Zn) 0.33333–0.33333
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:th2zn-c16)

Names (5): _corpus: _corpus:phase:th-zn:th2zn-c16  
_mp: _mp:mp-aaaaadnv  
_oqmd: _oqmd:oqmd-31107  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:Th2Zn  
_tdb: _tdb:ThZn-10Li.tdb:TH2ZN_C16  


### TDB models of TH2ZN_C16 (1): PHASE and CONSTITUENT statements as written

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): TH2ZN_C16, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
47: PHASE TH2ZN_C16 % 2 2 1 !
48: CONST TH2ZN_C16 : TH : ZN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## TH2ZN17 (Th–Zn)

- Id: `phase:th-zn:th2zn17`; status `assigned`
- Structure: Th2Zn17 · hR19 · R-3m (166); type `st:th2zn17-hr19`; tier B: DFT-supported (unique MP + OQMD match); confidence high
- Stoichiometry: Th 0.1053, Zn 0.8947
- Stability: stable in 1 of 1 calculated diagram(s): 300–1286.03 K, x(Zn) 0.89474–0.89474
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:th2zn17)

Names (5): _corpus: _corpus:phase:th-zn:th2zn17  
_mp: _mp:mp-aaabetxv  
_oqmd: _oqmd:oqmd-3836  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:Th2Zn17  
_tdb: _tdb:ThZn-10Li.tdb:TH2ZN17  


### TDB models of TH2ZN17 (1): PHASE and CONSTITUENT statements as written

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): TH2ZN17, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
62: PHASE TH2ZN17 % 2 2 17 !
63: CONST TH2ZN17 : TH : ZN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## THZN2 (Th–Zn)

- Id: `phase:th-zn:thzn2`; status `needs_review`
- No structure assigned. Why: mp_oqmd_space_groups_differ; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (dft_mp): P6/mmm (191) — on-hull MP ThZn2 at x(ZN)=0.6667
- Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Th1 Zn2 at x(ZN)=0.6667
- Candidate (literature_printed): (ThZn2) · hP\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (ThZn2) — Hallstedt 2025 mmc2 row for THZN2: ThZn2
- Stoichiometry: Th 0.3333, Zn 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1375.5 K, x(Zn) 0.66667–0.66667
- Literature: 10 values (10 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:thzn2)

Names (3): _corpus: _corpus:phase:th-zn:thzn2  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:ThZn2  
_tdb: _tdb:ThZn-10Li.tdb:THZN2  


### TDB models of THZN2 (1): PHASE and CONSTITUENT statements as written

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): THZN2, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
52: PHASE THZN2 % 2 1 2 !
53: CONST THZN2 : TH : ZN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports values for this phase_

## THZN4_D13 (Th–Zn)

- Id: `phase:th-zn:thzn4-d13`; status `assigned`
- Structure: Al4Ba · D1_3 · tI10 · I4/mmm (139); type `st:d1-3-al4ba-ti10`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaaauq and oqmd-18164, space group 139
- Stoichiometry: Th 0.2000, Zn 0.8000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1372.11 K, x(Zn) 0.8–0.8
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:th-zn:thzn4-d13)

Names (5): _corpus: _corpus:phase:th-zn:thzn4-d13  
_mp: _mp:mp-aaaaaauq  
_oqmd: _oqmd:oqmd-18164  
_paper: _paper:10.1016/j.jnucmat.2009.10.068:ThZn4  
_tdb: _tdb:ThZn-10Li.tdb:THZN4_D13  


### TDB models of THZN4_D13 (1): PHASE and CONSTITUENT statements as written

[ThZn-10Li.tdb](https://orchid-project.org/data/databases/sgte-binary/ThZn-10Li.tdb): THZN4_D13, type code %, sha256 `f6e94ddb75cfa754…`

~~~~text
57: PHASE THZN4_D13 % 2 1 4 !
58: CONST THZN4_D13 : TH : ZN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jnucmat.2009.10.068](https://doi.org/10.1016/j.jnucmat.2009.10.068) Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).  
_assessment that models this phase; reports 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).