# Mg–Tl phases

> Mg–Tl system: 7 phases (tier A 6, liquid 1); 6 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/MG-TL.html · Markdown: https://data.orchid-project.org/phases/pages/MG-TL.md

7 phases (tier A 6, liquid 1); 6 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=MG-TL) · [full JSON](https://data.orchid-project.org/phases/systems/MG-TL.json) · [Mg–Tl system page](https://data.orchid-project.org/systems/MG-TL.html) · [Markdown](https://data.orchid-project.org/phases/pages/MG-TL.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Mg–Tl system (7)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-mg-tl-bcc-a2); _phase:mg-tl:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 506.13–2499.5 K, x(Tl) 0.99975–1 | 4 | 1 |
| [FCC_A1](#phase-mg-tl-fcc-a1); _phase:mg-tl: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-mg-tl-hcp-a3); _phase:mg-tl:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–923.52 K, x(Tl) 0–1 | 4 | 1 |
| [LIQUID](#phase-mg-tl-liquid); _phase:mg-tl:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 474.84–2500 K, x(Tl) 0–1 | 12 | 1 |
| [MG2TL_C22](#phase-mg-tl-mg2tl-c22); _phase:mg-tl:mg2tl-c22_ | Fe2P · C22 · hP9 · P-62m (189) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–664.5 K, x(Tl) 0.33333–0.33333 | 4 | 1 |
| [MG5TL2_D8G](#phase-mg-tl-mg5tl2-d8g); _phase:mg-tl:mg5tl2-d8g_ | Ga2Mg5 · D8_g · oI28 · Ibam (72) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–687.41 K, x(Tl) 0.28571–0.28571 | 6 | 1 |
| [MGTL_B2](#phase-mg-tl-mgtl-b2); _phase:mg-tl:mgtl-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–631.88 K, x(Tl) 0.5–0.5 | 8 | 1 |

## BCC_A2 (Mg–Tl)

- Id: `phase:mg-tl: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): 506.13–2499.5 K, x(Tl) 0.99975–1
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:bcc-a2)

Names (3): _corpus: _corpus:phase:mg-tl:bcc-a2  
_paper: _paper:10.1016/j.jallcom.2007.04.031:bcc  
_tdb: _tdb:MgTl-08Liu.tdb:BCC_A2  


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

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): BCC_A2, type code %B, sha256 `e8378fccc52d0d12…`

~~~~text
31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : MG TL% : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1002/bbpc.19340400213](https://doi.org/10.1002/bbpc.19340400213) G. Grube, J. Hille, Z. Electrochem. 40 (1934) 101–106.  
_cited as the source of values for this phase_

## FCC_A1 (Mg–Tl)

- Id: `phase:mg-tl:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; 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:mg-tl:fcc-a1)

Names (2): _corpus: _corpus:phase:mg-tl:fcc-a1  
_tdb: _tdb:MgTl-08Liu.tdb:FCC_A1  


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

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): FCC_A1, type code %A, sha256 `e8378fccc52d0d12…`

~~~~text
26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : MG TL : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase_

## HCP_A3 (Mg–Tl)

- Id: `phase:mg-tl: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): 300–923.52 K, x(Tl) 0–1
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:hcp-a3)

Names (3): _corpus: _corpus:phase:mg-tl:hcp-a3  
_paper: _paper:10.1016/j.jallcom.2007.04.031:hcp  
_tdb: _tdb:MgTl-08Liu.tdb:HCP_A3  


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

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): HCP_A3, type code %A, sha256 `e8378fccc52d0d12…`

~~~~text
36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : MG% TL% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_

## LIQUID (Mg–Tl)

- Id: `phase:mg-tl:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 474.84–2500 K, x(Tl) 0–1
- Literature: 12 values (12 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:liquid)

Names (4): _corpus: _corpus:phase:mg-tl:liquid  
_paper: _paper:10.1016/j.jallcom.2007.04.031:Liquid, paper:10.1016/j.jallcom.2007.04.031:liquid  
_tdb: _tdb:MgTl-08Liu.tdb:LIQUID  


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

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): LIQUID, type code %, sha256 `e8378fccc52d0d12…`

~~~~text
21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : MG TL : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1002/bbpc.19340400213](https://doi.org/10.1002/bbpc.19340400213) G. Grube, J. Hille, Z. Electrochem. 40 (1934) 101–106.  
_cited as the source of values for this phase_

## MG2TL_C22 (Mg–Tl)

- Id: `phase:mg-tl:mg2tl-c22`; status `assigned`
- Structure: Fe2P · C22 · hP9 · P-62m (189); type `st:c22-fe2p-hp9`; tier A: standard phase name; confidence high
- Stoichiometry: Mg 0.6667, Tl 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–664.5 K, x(Tl) 0.33333–0.33333
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:mg2tl-c22)

Names (3): _corpus: _corpus:phase:mg-tl:mg2tl-c22  
_paper: _paper:10.1016/j.jallcom.2007.04.031:Mg2Tl  
_tdb: _tdb:MgTl-08Liu.tdb:MG2TL_C22  


### TDB models of MG2TL_C22 (1): PHASE and CONSTITUENT statements as written

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): MG2TL_C22, type code %, sha256 `e8378fccc52d0d12…`

~~~~text
46: PHASE MG2TL_C22 % 2 2 1 !
47: CONST MG2TL_C22 : MG : TL : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1002/bbpc.19340400213](https://doi.org/10.1002/bbpc.19340400213) G. Grube, J. Hille, Z. Electrochem. 40 (1934) 101–106.  
_cited as the source of values for this phase_

## MG5TL2_D8G (Mg–Tl)

- Id: `phase:mg-tl:mg5tl2-d8g`; status `assigned`
- Structure: Ga2Mg5 · D8_g · oI28 · Ibam (72); type `st:d8-g-ga2mg5-oi28`; tier A: standard phase name; confidence high
- Stoichiometry: Mg 0.7143, Tl 0.2857
- Stability: stable in 1 of 1 calculated diagram(s): 300–687.41 K, x(Tl) 0.28571–0.28571
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:mg5tl2-d8g)

Names (3): _corpus: _corpus:phase:mg-tl:mg5tl2-d8g  
_paper: _paper:10.1016/j.jallcom.2007.04.031:Mg5Tl2  
_tdb: _tdb:MgTl-08Liu.tdb:MG5TL2_D8G  


### TDB models of MG5TL2_D8G (1): PHASE and CONSTITUENT statements as written

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): MG5TL2_D8G, type code %, sha256 `e8378fccc52d0d12…`

~~~~text
41: PHASE MG5TL2_D8G % 2 5 2 !
42: CONST MG5TL2_D8G : MG : TL : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1002/bbpc.19340400213](https://doi.org/10.1002/bbpc.19340400213) G. Grube, J. Hille, Z. Electrochem. 40 (1934) 101–106.  
_cited as the source of values for this phase_

## MGTL_B2 (Mg–Tl)

- Id: `phase:mg-tl:mgtl-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Stoichiometry: Mg 0.5000, Tl 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 300–631.88 K, x(Tl) 0.5–0.5
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-tl:mgtl-b2)

Names (3): _corpus: _corpus:phase:mg-tl:mgtl-b2  
_paper: _paper:10.1016/j.jallcom.2007.04.031:MgTl  
_tdb: _tdb:MgTl-08Liu.tdb:MGTL_B2  


### TDB models of MGTL_B2 (1): PHASE and CONSTITUENT statements as written

[MgTl-08Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/MgTl-08Liu.tdb): MGTL_B2, type code %, sha256 `e8378fccc52d0d12…`

~~~~text
51: PHASE MGTL_B2 % 2 1 1 !
52: CONST MGTL_B2 : MG : TL : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2007.04.031](https://doi.org/10.1016/j.jallcom.2007.04.031) Yajun Liu, Dong Liang, Thermodynamic reevaluation of the Mg–Tl system, Journal of Alloys and Compounds 459, 286-290 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1002/bbpc.19340400213](https://doi.org/10.1002/bbpc.19340400213) G. Grube, J. Hille, Z. Electrochem. 40 (1934) 101–106.  
_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).