# Mn–Tb phases

> Mn–Tb system: 9 phases (tier A 8, liquid 1); 9 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/MN-TB.html · Markdown: https://data.orchid-project.org/phases/pages/MN-TB.md

9 phases (tier A 8, liquid 1); 9 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=MN-TB) · [full JSON](https://data.orchid-project.org/phases/systems/MN-TB.json) · [Mn–Tb system page](https://data.orchid-project.org/systems/MN-TB.html) · [Markdown](https://data.orchid-project.org/phases/pages/MN-TB.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Mn–Tb system (9)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-mn-tb-bcc-a2); _phase:mn-tb:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1410.75–2499.79 K, x(Tb) 0–1 | 0 | 1 |
| [CBCC_A12](#phase-mn-tb-cbcc-a12); _phase:mn-tb:cbcc-a12_ | alpha-Mn · A12 · cI58 · I-43m (217) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–980 K, x(Tb) 0–0 | 0 | 1 |
| [CUB_A13](#phase-mn-tb-cub-a13); _phase:mn-tb:cub-a13_ | beta-Mn · A13 · cP20 · P4_132 (213) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 980–1359.99 K, x(Tb) 0–0 | 0 | 1 |
| [FCC_A1](#phase-mn-tb-fcc-a1); _phase:mn-tb:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1359.99–1525.75 K, x(Tb) 0–0 | 0 | 1 |
| [HCP_A3](#phase-mn-tb-hcp-a3); _phase:mn-tb:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1562 K, x(Tb) 0.99995–1 | 0 | 1 |
| [LIQUID](#phase-mn-tb-liquid); _phase:mn-tb:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1038.7–2500 K, x(Tb) 0–1 | 0 | 1 |
| [MN12TB_D2B](#phase-mn-tb-mn12tb-d2b); _phase:mn-tb:mn12tb-d2b_ | Mn12Th · D2_b · tI26 · I4/mmm (139) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1327.33 K, x(Tb) 0.07692–0.07692 | 0 | 1 |
| [MN23TB6_D8A](#phase-mn-tb-mn23tb6-d8a); _phase:mn-tb:mn23tb6-d8a_ | Mn23Th6 · D8_a · cF116 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1345.82 K, x(Tb) 0.2069–0.2069 | 0 | 1 |
| [MN2TB_C15](#phase-mn-tb-mn2tb-c15); _phase:mn-tb:mn2tb-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1335.48 K, x(Tb) 0.33333–0.33333 | 0 | 1 |

## BCC_A2 (Mn–Tb)

- Id: `phase:mn-tb: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): 1410.75–2499.79 K, x(Tb) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:bcc-a2)

Names (2): _corpus: _corpus:phase:mn-tb:bcc-a2  
_tdb: _tdb:MnTb-24Ye.tdb:BCC_A2  


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

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): BCC_A2, type code %B, sha256 `52402e50cb486c05…`

~~~~text
32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : MN% TB% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## CBCC_A12 (Mn–Tb)

- Id: `phase:mn-tb:cbcc-a12`; status `assigned`
- Structure: alpha-Mn · A12 · cI58 · I-43m (217); type `st:a12-alpha-mn-ci58`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 300–980 K, x(Tb) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:cbcc-a12)

Names (2): _corpus: _corpus:phase:mn-tb:cbcc-a12  
_tdb: _tdb:MnTb-24Ye.tdb:CBCC_A12  


### TDB models of CBCC_A12 (1): PHASE and CONSTITUENT statements as written

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): CBCC_A12, type code %A, sha256 `52402e50cb486c05…`

~~~~text
42: PHASE CBCC_A12 %A 2 1 1 !
43: CONST CBCC_A12 : MN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## CUB_A13 (Mn–Tb)

- Id: `phase:mn-tb:cub-a13`; status `assigned`
- Structure: beta-Mn · A13 · cP20 · P4_132 (213); type `st:a13-beta-mn-cp20`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 980–1359.99 K, x(Tb) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:cub-a13)

Names (2): _corpus: _corpus:phase:mn-tb:cub-a13  
_tdb: _tdb:MnTb-24Ye.tdb:CUB_A13  


### TDB models of CUB_A13 (1): PHASE and CONSTITUENT statements as written

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): CUB_A13, type code %, sha256 `52402e50cb486c05…`

~~~~text
47: PHASE CUB_A13 % 2 1 1 !
48: CONST CUB_A13 : MN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## FCC_A1 (Mn–Tb)

- Id: `phase:mn-tb:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 1359.99–1525.75 K, x(Tb) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:fcc-a1)

Names (2): _corpus: _corpus:phase:mn-tb:fcc-a1  
_tdb: _tdb:MnTb-24Ye.tdb:FCC_A1  


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

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): FCC_A1, type code %A, sha256 `52402e50cb486c05…`

~~~~text
27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : MN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## HCP_A3 (Mn–Tb)

- Id: `phase:mn-tb: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): 300–1562 K, x(Tb) 0.99995–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:hcp-a3)

Names (2): _corpus: _corpus:phase:mn-tb:hcp-a3  
_tdb: _tdb:MnTb-24Ye.tdb:HCP_A3  


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

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): HCP_A3, type code %A, sha256 `52402e50cb486c05…`

~~~~text
37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : MN TB% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## LIQUID (Mn–Tb)

- Id: `phase:mn-tb:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1038.7–2500 K, x(Tb) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:liquid)

Names (2): _corpus: _corpus:phase:mn-tb:liquid  
_tdb: _tdb:MnTb-24Ye.tdb:LIQUID  


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

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): LIQUID, type code %, sha256 `52402e50cb486c05…`

~~~~text
22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : MN TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## MN12TB_D2B (Mn–Tb)

- Id: `phase:mn-tb:mn12tb-d2b`; status `assigned`
- Structure: Mn12Th · D2_b · tI26 · I4/mmm (139); type `st:d2-b-mn12th-ti26`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 0.9231, Tb 0.0769
- Stability: stable in 1 of 1 calculated diagram(s): 300–1327.33 K, x(Tb) 0.07692–0.07692
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:mn12tb-d2b)

Names (2): _corpus: _corpus:phase:mn-tb:mn12tb-d2b  
_tdb: _tdb:MnTb-24Ye.tdb:MN12TB_D2B  


### TDB models of MN12TB_D2B (1): PHASE and CONSTITUENT statements as written

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): MN12TB_D2B, type code %, sha256 `52402e50cb486c05…`

~~~~text
52: PHASE MN12TB_D2B % 2 12 1 !
53: CONST MN12TB_D2B : MN : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## MN23TB6_D8A (Mn–Tb)

- Id: `phase:mn-tb:mn23tb6-d8a`; status `assigned`
- Structure: Mn23Th6 · D8_a · cF116 · Fm-3m (225); type `st:d8-a-mn23th6-cf116`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 0.7931, Tb 0.2069
- Stability: stable in 1 of 1 calculated diagram(s): 300–1345.82 K, x(Tb) 0.2069–0.2069
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:mn23tb6-d8a)

Names (2): _corpus: _corpus:phase:mn-tb:mn23tb6-d8a  
_tdb: _tdb:MnTb-24Ye.tdb:MN23TB6_D8A  


### TDB models of MN23TB6_D8A (1): PHASE and CONSTITUENT statements as written

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): MN23TB6_D8A, type code %A, sha256 `52402e50cb486c05…`

~~~~text
57: PHASE MN23TB6_D8A %A 2 23 6 !
58: CONST MN23TB6_D8A : MN : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models this phase_

## MN2TB_C15 (Mn–Tb)

- Id: `phase:mn-tb:mn2tb-c15`; status `assigned`
- Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type `st:c15-cu2mg-cf24`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 0.6667, Tb 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1335.48 K, x(Tb) 0.33333–0.33333
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-tb:mn2tb-c15)

Names (2): _corpus: _corpus:phase:mn-tb:mn2tb-c15  
_tdb: _tdb:MnTb-24Ye.tdb:MN2TB_C15  


### TDB models of MN2TB_C15 (1): PHASE and CONSTITUENT statements as written

[MnTb-24Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/MnTb-24Ye.tdb): MN2TB_C15, type code %A, sha256 `52402e50cb486c05…`

~~~~text
62: PHASE MN2TB_C15 %A 2 2 1 !
63: CONST MN2TB_C15 : MN : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1002/mgea.39](https://doi.org/10.1002/mgea.39) Hongjian Ye, Jiang Wang, Qing Chen, Guanghui Rao, Huaiying Zhou, Development of thermodynamic database of the Mn‐RE (RE = rare earth metals) binary systems, Materials Genome Engineering Advances 2 (2024).  
_assessment that models 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).