# Ni–Th phases

> Ni–Th system: 12 phases (tier A 6, tier B 1, tier C 1, liquid 1, needs_review 3); 11 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/NI-TH.html · Markdown: https://data.orchid-project.org/phases/pages/NI-TH.md

12 phases (tier A 6, tier B 1, tier C 1, liquid 1, needs_review 3); 11 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=NI-TH) · [full JSON](https://data.orchid-project.org/phases/systems/NI-TH.json) · [Ni–Th system page](https://data.orchid-project.org/systems/NI-TH.html) · [Markdown](https://data.orchid-project.org/phases/pages/NI-TH.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Ni–Th system (12)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-ni-th-bcc-a2); _phase:ni-th:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 301.12–3999.87 K, x(Th) 0.99969–1 | 0 | 1 |
| [FCC_A1](#phase-ni-th-fcc-a1); _phase:ni-th:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1739.57 K, x(Th) 0–1 | 6 | 1 |
| [HCP_A3](#phase-ni-th-hcp-a3); _phase:ni-th: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-ni-th-liquid); _phase:ni-th:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1280.93–4000 K, x(Th) 0–1 | 30 | 1 |
| [NI17TH2](#phase-ni-th-ni17th2); _phase:ni-th:ni17th2_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1620.62 K, x(Th) 0.09524–0.09524 | 0 | 1 |
| [NI2TH_C32](#phase-ni-th-ni2th-c32); _phase:ni-th:ni2th-c32_ | AlB2 · C32 · hP3 · P6/mmm (191) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1319.15 K, x(Th) 0.33333–0.33333 | 5 | 1 |
| [NI3TH7_D102](#phase-ni-th-ni3th7-d102); _phase:ni-th:ni3th7-d102_ | Fe3Th7 · D10_2 · hP20 · P6_3mc (186) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1312.11 K, x(Th) 0.7–0.7 | 7 | 1 |
| [NI5TH_D2D](#phase-ni-th-ni5th-d2d); _phase:ni-th:ni5th-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1792.18 K, x(Th) 0.16667–0.16667 | 6 | 1 |
| [NI7TH2_ALPHA](#phase-ni-th-ni7th2-alpha); _phase:ni-th:ni7th2-alpha_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1470.59 K, x(Th) 0.22222–0.22222 | 7 | 1 |
| [NI7TH2_BETA](#phase-ni-th-ni7th2-beta); _phase:ni-th:ni7th2-beta_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 1470.59–1516.04 K, x(Th) 0.22222–0.22222 | 2 | 1 |
| [NI7TH4](#phase-ni-th-ni7th4); _phase:ni-th:ni7th4_ | Ni7Th4 · mC12 · C2/c (15) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1345.65 K, x(Th) 0.36364–0.36364 | 6 | 1 |
| [NITH](#phase-ni-th-nith); _phase:ni-th:nith_ | AgSr · oP16 · Pnma (62) | tier B: DFT-supported (unique MP + OQMD match) | stable in 1 of 1 calculated diagram(s): 300–1462.8 K, x(Th) 0.5–0.5 | 7 | 1 |

## BCC_A2 (Ni–Th)

- Id: `phase:ni-th: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): 301.12–3999.87 K, x(Th) 0.99969–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:bcc-a2)

Names (2): _corpus: _corpus:phase:ni-th:bcc-a2  
_tdb: _tdb:NiTh-09Wan.tdb:BCC_A2  


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

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): BCC_A2, type code %B, sha256 `e7c08f09f82aa588…`

~~~~text
35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : NI TH% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase_

## FCC_A1 (Ni–Th)

- Id: `phase:ni-th: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): 300–1739.57 K, x(Th) 0–1
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:fcc-a1)

Names (4): _corpus: _corpus:phase:ni-th:fcc-a1  
_paper: _paper:10.1016/j.jallcom.2009.07.168:(Ni), paper:10.1016/j.jallcom.2009.07.168:(αTh)  
_tdb: _tdb:NiTh-09Wan.tdb:FCC_A1  


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

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): FCC_A1, type code %A, sha256 `e7c08f09f82aa588…`

~~~~text
30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : NI% TH% : VA : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## HCP_A3 (Ni–Th)

- Id: `phase:ni-th: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: Ni 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:ni-th:hcp-a3)

Names (2): _corpus: _corpus:phase:ni-th:hcp-a3  
_tdb: _tdb:NiTh-09Wan.tdb:HCP_A3  


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

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): HCP_A3, type code %A, sha256 `e7c08f09f82aa588…`

~~~~text
40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : NI : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase_

## LIQUID (Ni–Th)

- Id: `phase:ni-th:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1280.93–4000 K, x(Th) 0–1
- Literature: 30 values (30 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:liquid)

Names (3): _corpus: _corpus:phase:ni-th:liquid  
_paper: _paper:10.1016/j.jallcom.2009.07.168:L  
_tdb: _tdb:NiTh-09Wan.tdb:LIQUID  


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

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): LIQUID, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : NI TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## NI17TH2 (Ni–Th)

- Id: `phase:ni-th:ni17th2`; status `needs_review`
- No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_on_hull_entry_in_both; no_structure_token
- Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for NI17TH2: Ni17Th2
- Candidate (tdb_comment): Ni17Th2 · hP38 · P6_3/mmc — NiTh-09Wan.tdb: 'Prototype Ni17Th2 (hP38, P6_3/mmc)'
- Stoichiometry: Ni 0.9048, Th 0.0952
- Stability: stable in 1 of 1 calculated diagram(s): 300–1620.62 K, x(Th) 0.09524–0.09524
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni17th2)

Names (2): _corpus: _corpus:phase:ni-th:ni17th2  
_tdb: _tdb:NiTh-09Wan.tdb:NI17TH2  


### TDB models of NI17TH2 (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI17TH2, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
45: PHASE NI17TH2 % 2 19 2 !
46: CONST NI17TH2 : NI : TH : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase_

## NI2TH_C32 (Ni–Th)

- Id: `phase:ni-th:ni2th-c32`; status `assigned`
- Structure: AlB2 · C32 · hP3 · P6/mmm (191); type `st:c32-alb2-hp3`; tier A: standard phase name; confidence high
- Stoichiometry: Ni 0.6667, Th 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1319.15 K, x(Th) 0.33333–0.33333
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni2th-c32)

Names (3): _corpus: _corpus:phase:ni-th:ni2th-c32  
_paper: _paper:10.1016/j.jallcom.2009.07.168:ThNi2  
_tdb: _tdb:NiTh-09Wan.tdb:NI2TH_C32  


### TDB models of NI2TH_C32 (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI2TH_C32, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
65: PHASE NI2TH_C32 % 2 2 1 !
66: CONST NI2TH_C32 : NI : TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## NI3TH7_D102 (Ni–Th)

- Id: `phase:ni-th:ni3th7-d102`; status `assigned`
- Structure: Fe3Th7 · D10_2 · hP20 · P6_3mc (186); type `st:d10-2-fe3th7-hp20`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaabtoz and oqmd-17836, space group 186
- Stoichiometry: Ni 0.3000, Th 0.7000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1312.11 K, x(Th) 0.7–0.7
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni3th7-d102)

Names (5): _corpus: _corpus:phase:ni-th:ni3th7-d102  
_mp: _mp:mp-aaaabtoz  
_oqmd: _oqmd:oqmd-17836  
_paper: _paper:10.1016/j.jallcom.2009.07.168:Th7Ni3  
_tdb: _tdb:NiTh-09Wan.tdb:NI3TH7_D102  


### TDB models of NI3TH7_D102 (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI3TH7_D102, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
80: PHASE NI3TH7_D102 % 2 3 7 !
81: CONST NI3TH7_D102 : NI : TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## NI5TH_D2D (Ni–Th)

- Id: `phase:ni-th:ni5th-d2d`; status `assigned`
- Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type `st:d2-d-cacu5-hp6`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaacih and oqmd-17837, space group 191
- Stoichiometry: Ni 0.8333, Th 0.1667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1792.18 K, x(Th) 0.16667–0.16667
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni5th-d2d)

Names (5): _corpus: _corpus:phase:ni-th:ni5th-d2d  
_mp: _mp:mp-aaaaacih  
_oqmd: _oqmd:oqmd-17837  
_paper: _paper:10.1016/j.jallcom.2009.07.168:ThNi5  
_tdb: _tdb:NiTh-09Wan.tdb:NI5TH_D2D  


### TDB models of NI5TH_D2D (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI5TH_D2D, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
50: PHASE NI5TH_D2D % 2 5 1 !
51: CONST NI5TH_D2D : NI : TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## NI7TH2_ALPHA (Ni–Th)

- Id: `phase:ni-th:ni7th2-alpha`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
- Candidate (dft_mp): P6_3/mmc (194) — on-hull MP Th2Ni7 at x(TH)=0.2222
- Candidate (dft_oqmd): R-3m (166) — on-hull OQMD Ni7 Th2 at x(TH)=0.2222
- Candidate (sgte_mmc2): Ce2Ni7 · hP36 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for NI7TH2_ALPHA: Ni7Th2-alpha
- Candidate (tdb_comment): Ce2Ni7 · hP36 · P6_3/mmc — NiTh-09Wan.tdb: 'Prototype Ce2Ni7 (hP36, P6_3/mmc)'
- Stoichiometry: Ni 0.7778, Th 0.2222
- Stability: stable in 1 of 1 calculated diagram(s): 300–1470.59 K, x(Th) 0.22222–0.22222
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni7th2-alpha)

Names (4): _corpus: _corpus:phase:ni-th:ni7th2-alpha  
_paper: _paper:10.1016/j.jallcom.2009.07.168:αTh2Ni7, paper:10.1016/j.jallcom.2009.07.168:αThNi  
_tdb: _tdb:NiTh-09Wan.tdb:NI7TH2_ALPHA  


### TDB models of NI7TH2_ALPHA (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI7TH2_ALPHA, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
55: PHASE NI7TH2_ALPHA % 2 7 2 !
56: CONST NI7TH2_ALPHA : NI : TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_cited as the source of values for this phase_

## NI7TH2_BETA (Ni–Th)

- Id: `phase:ni-th:ni7th2-beta`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
- Candidate (dft_mp): P6_3/mmc (194) — on-hull MP Th2Ni7 at x(TH)=0.2222
- Candidate (dft_oqmd): R-3m (166) — on-hull OQMD Ni7 Th2 at x(TH)=0.2222
- Candidate (sgte_mmc2): Co7Gd2 · hR18 · R-3m (166) — Hallstedt 2025 mmc2 row for NI7TH2_BETA: Ni7Th2-beta
- Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — NiTh-09Wan.tdb: 'Prototype Co7Gd2 (hR18, R-3m)'
- Stoichiometry: Ni 0.7778, Th 0.2222
- Stability: stable in 1 of 1 calculated diagram(s): 1470.59–1516.04 K, x(Th) 0.22222–0.22222
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni7th2-beta)

Names (3): _corpus: _corpus:phase:ni-th:ni7th2-beta  
_paper: _paper:10.1016/j.jallcom.2009.07.168:Th2Ni7  
_tdb: _tdb:NiTh-09Wan.tdb:NI7TH2_BETA  


### TDB models of NI7TH2_BETA (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI7TH2_BETA, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
60: PHASE NI7TH2_BETA % 2 7 2 !
61: CONST NI7TH2_BETA : NI : TH : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_

## NI7TH4 (Ni–Th)

- Id: `phase:ni-th:ni7th4`; status `assigned`
- Structure: Ni7Th4 · mC12 · C2/c (15); type `st:ni7th4-mc12`; 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: Ni 0.6364, Th 0.3636
- Stability: stable in 1 of 1 calculated diagram(s): 300–1345.65 K, x(Th) 0.36364–0.36364
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:ni7th4)

Names (3): _corpus: _corpus:phase:ni-th:ni7th4  
_paper: _paper:10.1016/j.jallcom.2009.07.168:Th4Ni7  
_tdb: _tdb:NiTh-09Wan.tdb:NI7TH4  


### TDB models of NI7TH4 (1): PHASE and CONSTITUENT statements as written

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NI7TH4, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
70: PHASE NI7TH4 % 2 7 4 !
71: CONST NI7TH4 : NI : TH : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_

## NITH (Ni–Th)

- Id: `phase:ni-th:nith`; status `assigned`
- Structure: AgSr · oP16 · Pnma (62); type `st:agsr-op16`; tier B: DFT-supported (unique MP + OQMD match); confidence high
- Stoichiometry: Ni 0.5000, Th 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1462.8 K, x(Th) 0.5–0.5
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ni-th:nith)

Names (5): _corpus: _corpus:phase:ni-th:nith  
_mp: _mp:mp-aaabjmvs  
_oqmd: _oqmd:oqmd-17835  
_paper: _paper:10.1016/j.jallcom.2009.07.168:ThNi  
_tdb: _tdb:NiTh-09Wan.tdb:NITH  


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

[NiTh-09Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/NiTh-09Wan.tdb): NITH, type code %, sha256 `e7c08f09f82aa588…`

~~~~text
75: PHASE NITH % 2 1 1 !
76: CONST NITH : NI : TH : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2009.07.168](https://doi.org/10.1016/j.jallcom.2009.07.168) C.P. Wang, Y. He, H.L. Zhang, X.J. Liu, Thermodynamic assessments of the U–Ni and Th–Ni systems, Journal of Alloys and Compounds 487, 126-131 (2009).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02645711](https://doi.org/10.1007/bf02645711) H. Okamoto, T.B. Massalski, J. Phase Equilib. 12 (2) (1991) 148–168.  
_cited as the source of values for this phase_
- [doi:10.1007/bf02881873](https://doi.org/10.1007/bf02881873) C. J. Santandrea, D. E. Peterson, The Ni−Th (Nickel-Thorium) system, Bulletin of Alloy Phase Diagrams 9, 487-490 (1988).  
_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).