# Te–Tl system

> Te–Tl system: 57 accepted literature values (invariant reaction 29, formation 22, other property 3, phase transition 3) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/TE-TL.html · Markdown: https://data.orchid-project.org/systems/TE-TL.md

57 accepted literature values from 2 paper(s) (experimental 24, model 29, unspecified 4); 0 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/TE-TL.json) · [CSV](https://data.orchid-project.org/systems/TE-TL.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#TE-TL) · [phases (10)](https://data.orchid-project.org/phases/pages/TE-TL.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/TE-TL.html) · [Markdown](https://data.orchid-project.org/systems/TE-TL.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 24 |
| model | 29 |
| unspecified | 4 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 29 |
| phase transition | 3 |
| formation | 22 |
| other property | 3 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/TE/TE-TL.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/TE/TE-TL.json) · [CALPHAD hull TlTe-93Oh](https://data.orchid-project.org/hulls/calphad-sgte/TE/TE-TL--TlTe-93Oh.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Te–Tl system (29)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 681 | γ/L/L | γ: Tl 0.667; L: Tl 0.96 | model | [1] Oh 1993 | Table 2, p. 6, row 18; `ORC-KJI5CDWMXV` |  |
| 681 | γ/L/L | γ: Tl 0.667; L: Tl 0.97 | experimental | [1] Oh 1993; _cites ref. 8_ | Table 2, p. 6, row 17; `ORC-KSZN6XAFIN` |  |
| 681 | L1 + TeTl2 = L2 | TeTl2: Te 0.333333 | experimental | [2] Gierlotka 2010; _cites Okamoto 2000_ [doi](https://doi.org/10.1361/105497100770339833) | Table III, p. 5, row 11; `ORC-ZGOCAJFW6M` |  |
| 680.4 | L1 + TeTl2 = L2 | TeTl2: Te 0.333333 | model | [2] Gierlotka 2010 | Table III, p. 5, row 10; `ORC-NA3OVN6LBA` |  |
| 677 | γ/L/L | γ: Tl 0.64; L: Tl 0.69 | experimental | [1] Oh 1993; _cites ref. 14_ | Table 2, p. 6, row 16; `ORC-MUUFTICY5K` |  |
| 574 | γ/L/βTl | γ: Tl 0.64; βTl: Tl 1 | experimental | [1] Oh 1993; _cites ref. 14_ | Table 2, p. 6, row 19; `ORC-KHQ7LIVUHS` |  |
| 574 | L/TeTl/γ | L: Tl 0.46; TeTl: Tl 0.5; γ: Tl 0.625 | model | [1] Oh 1993; _cites ref. 28_ | Table 2, p. 6, row 13; `ORC-NXZYG2ABFM` |  |
| 574 | L/TeTl/γ | L: Tl 0.46; TeTl: Tl 0.5; γ: Tl 0.625 | model | [1] Oh 1993; _cites ref. 30_ | Table 2, p. 6, row 14; `ORC-RW2X4NTLWV` |  |
| 574 | γ/L/βTl | γ: Tl 0.667; L: Tl 0.995; βTl: Tl 1 | model | [1] Oh 1993 | Table 2, p. 6, row 21; `ORC-X6OJRLHZK3` |  |
| 573.9 | L + Te3Tl5 = TeTl | Te3Tl5: Te 0.375; TeTl: Te 0.5 | model | [2] Gierlotka 2010 | Table III, p. 5, row 5; `ORC-I5AAABLT6H` |  |
| 573 | L/TeTl/γ | L: Tl 0.42; TeTl: Tl 0.5; γ: Tl 0.605 | experimental | [1] Oh 1993; _cites ref. 8_ | Table 2, p. 6, row 12; `ORC-BFOERYCOA7` |  |
| 573 | L/TeTl/γ | L: Tl 0.465; TeTl: Tl 0.5; γ: Tl 0.625 | model | [1] Oh 1993 | Table 2, p. 6, row 15; `ORC-ILKPM7KCHD` |  |
| 573 | L/TeTl/γ | L: Tl 0.42; TeTl: Tl 0.5; γ: Tl 0.62 | experimental | [1] Oh 1993; _cites ref. 14_ | Table 2, p. 6, row 11; `ORC-KXRM6B7OYQ` |  |
| 573 | L + Te3Tl5 = TeTl | Te3Tl5: Te 0.375; TeTl: Te 0.5 | experimental | [2] Gierlotka 2010; _cites Okamoto 2000_ [doi](https://doi.org/10.1361/105497100770339833) | Table III, p. 5, row 6; `ORC-PCIRTYESEO` |  |
| 573 | γ/L/βTl | γ: Tl 0.667; βTl: Tl 1 | experimental | [1] Oh 1993; _cites ref. 8_ | Table 2, p. 6, row 20; `ORC-WIUHNG3JH2` |  |
| 511 | L/Te3Tl2/TeTl | L: Tl 0.33; Te3Tl2: Tl 0.4; TeTl: Tl 0.5 | experimental | [1] Oh 1993; _cites ref. 14_ | Table 2, p. 6, row 6; `ORC-FQXGHP635X` |  |
| 508 | L/Te3Tl2/TeTl | L: Tl 0.345; Te3Tl2: Tl 0.4; TeTl: Tl 0.5 | model | [1] Oh 1993; _cites ref. 30_ | Table 2, p. 6, row 9; `ORC-5KORNUHPGD` |  |
| 508 | L + TeTl = Te3Tl2 | TeTl: Te 0.5; Te3Tl2: Te 0.6 | experimental | [2] Gierlotka 2010; _cites Okamoto 2000_ [doi](https://doi.org/10.1361/105497100770339833) | Table III, p. 5, row 4; `ORC-S7SMQOZACI` |  |
| 508 | L/Te3Tl2/TeTl | L: Tl 0.34; Te3Tl2: Tl 0.4; TeTl: Tl 0.5 | experimental | [1] Oh 1993; _cites ref. 8_ | Table 2, p. 6, row 7; `ORC-TX4CSYNKJE` |  |
| 508 | L/Te3Tl2/TeTl | L: Tl 0.335; Te3Tl2: Tl 0.4; TeTl: Tl 0.5 | model | [1] Oh 1993; _cites ref. 28_ | Table 2, p. 6, row 8; `ORC-WML7ZG3K2B` |  |
| 507.9 | L + TeTl = Te3Tl2 | TeTl: Te 0.5; Te3Tl2: Te 0.6 | model | [2] Gierlotka 2010 | Table III, p. 5, row 3; `ORC-K4YPQALF7J` |  |
| 507 | L/Te3Tl2/TeTl | L: Tl 0.357; Te3Tl2: Tl 0.4; TeTl: Tl 0.5 | model | [1] Oh 1993 | Table 2, p. 6, row 10; `ORC-QOKOBN5PAY` |  |
| 504 | Te/L/Te3Tl2 | Te: Tl 0; L: Tl 0.336; Te3Tl2: Tl 0.4 | model | [1] Oh 1993; _cites ref. 30_ | Table 2, p. 6, row 4; `ORC-DQ5VCTBRJ5` |  |
| 504 | Te/L/Te3Tl2 | Te: Tl 0; L: Tl 0.325; Te3Tl2: Tl 0.4 | model | [1] Oh 1993; _cites ref. 28_ | Table 2, p. 6, row 3; `ORC-ODEK36ZWML` |  |
| 504 | Te/L/Te3Tl2 | Te: Tl 0; L: Tl 0.346; Te3Tl2: Tl 0.4 | model | [1] Oh 1993 | Table 2, p. 6, row 5; `ORC-WRW3LKJPLH` |  |
| 497.3 | L = Hexagonal_A8 + Te3Tl2 | Hexagonal_A8: Te 1; Te3Tl2: Te 0.6 | model | [2] Gierlotka 2010 | Table III, p. 5, row 1; `ORC-WDLD72BWCT` |  |
| 497 | Te/L/Te3Tl2 | Te: Tl 0; L: Tl 0.31; Te3Tl2: Tl 0.4 | experimental | [1] Oh 1993; _cites ref. 8_ | Table 2, p. 6, row 2; `ORC-FTBNXY7ZPC` |  |
| 497 | Te/L/Te3Tl2 | Te: Tl 0; L: Tl 0.29; Te3Tl2: Tl 0.4 | experimental | [1] Oh 1993; _cites ref. 14_ | Table 2, p. 6, row 1; `ORC-PNWMMARIZ3` |  |
| 497 | L = Hexagonal_A8 + Te3Tl2 | Hexagonal_A8: Te 1; Te3Tl2: Te 0.6 | experimental | [2] Gierlotka 2010; _cites Okamoto 2000_ [doi](https://doi.org/10.1361/105497100770339833) | Table III, p. 5, row 2; `ORC-T4FAOFLKAH` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Te–Tl system (19)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Te3Tl2 | [Tl2Te3](https://data.orchid-project.org/compounds/Tl2Te3.html) | -17.99 kJ/mol-atom | 298.15 | model | -43.202 (mp-aaaabryt) | -18.351 (oqmd-25268) | [2] Gierlotka 2010; _cites Landolt-Bornstein 2009_ | Table IV, p. 5, row 2; `ORC-6WGO7OFOGJ` |  |
| Te3Tl2 | [Tl2Te3](https://data.orchid-project.org/compounds/Tl2Te3.html) | -17.99 kJ/mol-atom | 298.15 | experimental | -43.202 (mp-aaaabryt) | -18.351 (oqmd-25268) | [1] Oh 1993; _cites ref. 26_ | Table 3, p. 6, row 1; `ORC-HPF2C7PFZM.5f003e` |  |
| Te3Tl2 | [Tl2Te3](https://data.orchid-project.org/compounds/Tl2Te3.html) | -17.982 kJ/mol-atom | 298.15 | model | -43.202 (mp-aaaabryt) | -18.351 (oqmd-25268) | [2] Gierlotka 2010 | Table IV, p. 5, row 1; `ORC-K3H3UH2KK5` |  |
| Te3Tl2 | [Tl2Te3](https://data.orchid-project.org/compounds/Tl2Te3.html) | -17.91 kJ/mol-atom | 298.15 | model | -43.202 (mp-aaaabryt) | -18.351 (oqmd-25268) | [1] Oh 1993 | Table 3, p. 6, row 3; `ORC-FSP75VD3H4.6cc764` |  |
| Te3Tl2 | [Tl2Te3](https://data.orchid-project.org/compounds/Tl2Te3.html) | -17.57 kJ/mol-atom | 298.15 | experimental | -43.202 (mp-aaaabryt) | -18.351 (oqmd-25268) | [1] Oh 1993; _cites ref. 27_ | Table 3, p. 6, row 2; `ORC-KOZWZVEI53.c6e908` |  |
| Te3Tl5 | [Tl5Te3](https://data.orchid-project.org/compounds/Tl5Te3.html) | -27.157 kJ/mol-atom | 298.15 | model | -42.288 (mp-aaaaaags) | -26.55 (oqmd-2028809) | [2] Gierlotka 2010 | Table IV, p. 5, row 5; `ORC-UGTBOQK7QE` |  |
| Te3Tl5 | [Tl5Te3](https://data.orchid-project.org/compounds/Tl5Te3.html) | -27.06 kJ/mol-atom | 298.15 | model | -42.288 (mp-aaaaaags) | -26.55 (oqmd-2028809) | [2] Gierlotka 2010; _cites Landolt-Bornstein 2009_ | Table IV, p. 5, row 7; `ORC-CLB66PCJZU` |  |
| Te3Tl5 | [Tl5Te3](https://data.orchid-project.org/compounds/Tl5Te3.html) | -19.53 kJ/mol-atom | 298.15 | model | -42.288 (mp-aaaaaags) | -26.55 (oqmd-2028809) | [2] Gierlotka 2010; _cites Landolt-Bornstein 2009_ | Table IV, p. 5, row 6; `ORC-75GA32FHKP` |  |
| TeTl | [TlTe](https://data.orchid-project.org/compounds/TlTe.html) | -22.53 kJ/mol-atom | 298.15 | model | -45.734 (mp-aaaaadau) | -22.93 (oqmd-647722) | [1] Oh 1993 | Table 3, p. 6, row 6; `ORC-LYBAGZYJQA.face3e` |  |
| TeTl | [TlTe](https://data.orchid-project.org/compounds/TlTe.html) | -21.92 kJ/mol-atom | 298.15 | experimental | -45.734 (mp-aaaaadau) | -22.93 (oqmd-647722) | [1] Oh 1993; _cites ref. 26_ | Table 3, p. 6, row 4; `ORC-MEYGLBV6G2.c933aa` |  |
| TeTl | [TlTe](https://data.orchid-project.org/compounds/TlTe.html) | -21.76 kJ/mol-atom | 298.15 | experimental | -45.734 (mp-aaaaadau) | -22.93 (oqmd-647722) | [1] Oh 1993; _cites ref. 27_ | Table 3, p. 6, row 5; `ORC-CYNYBUMDH2.8b7ddf` |  |
| TeTl | [TlTe](https://data.orchid-project.org/compounds/TlTe.html) | -21.76 kJ/mol-atom | 298.15 | model | -45.734 (mp-aaaaadau) | -22.93 (oqmd-647722) | [2] Gierlotka 2010; _cites Landolt-Bornstein 2009_ | Table IV, p. 5, row 4; `ORC-SPMZG2RBA5` |  |
| TeTl | [TlTe](https://data.orchid-project.org/compounds/TlTe.html) | -21.44 kJ/mol-atom | 298.15 | model | -45.734 (mp-aaaaadau) | -22.93 (oqmd-647722) | [2] Gierlotka 2010 | Table IV, p. 5, row 3; `ORC-5NSO5EFXVL` |  |
| γ |  | -27.06 kJ/mol-atom | 298.15 | experimental |  |  | [1] Oh 1993; _cites ref. 27_ | Table 3, p. 6, row 10; `ORC-5O7UUJZGGP.b33b77` |  |
| γ |  | -26.78 kJ/mol-atom | 298.15 | experimental |  |  | [1] Oh 1993; _cites ref. 26_ | Table 3, p. 6, row 9; `ORC-YRADTFIID6.479ebc` |  |
| γ |  | -26.17 kJ/mol-atom | 298.15 | model |  |  | [1] Oh 1993 | Table 3, p. 6, row 12; `ORC-E7XW5WJGMD.892a10` |  |
| γ |  | -24.13 kJ/mol-atom | 298.15 | experimental |  |  | [1] Oh 1993; _cites ref. 20_ | Table 3, p. 6, row 11; `ORC-VSFWM2HWE6.2d488d` |  |
| γ |  | -21.62 kJ/mol-atom | 298.15 | experimental |  |  | [1] Oh 1993; _cites ref. 17_ | Table 3, p. 6, row 8; `ORC-XX3OQZSEY7.bdc5ae` |  |
| γ |  | -19.53 kJ/mol-atom | 298.15 | experimental |  |  | [1] Oh 1993; _cites ref. 25_ | Table 3, p. 6, row 7; `ORC-3IPLPWTUAW.d41d56` |  |

## Other properties

### Phase transition (3)

Table: Phase transition, Te–Tl system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 692 K | 692 | L = TeTl2; _L: Te 0.333333; TeTl2: Te 0.333333_ | model | [2] Gierlotka 2010 | Table III, p. 5, row 9; `ORC-EQ3JRGHBSV` |  |
| Phase transition | 727.8 K | 727.8 | L = Te3Tl5; _L: Te 0.375; Te3Tl5: Te 0.375_ | model | [2] Gierlotka 2010 | Table III, p. 5, row 7; `ORC-SHJOVEHGNX` |  |
| Phase transition | 728 K | 728 | L = Te3Tl5; _L: Te 0.375; Te3Tl5: Te 0.375_ | experimental | [2] Gierlotka 2010; _cites Okamoto 2000_ [doi](https://doi.org/10.1361/105497100770339833) | Table III, p. 5, row 8; `ORC-NFJAJ7RF5F` |  |

### Formation (3)

Table: Formation, Te–Tl system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: ΔfusS_ | 12.3 J/mol-atom/K |  | γ | unspecified | [1] Oh 1993; _cites ref. 28_ | Table 3, p. 6, row 14; `ORC-XWZHDUVAST.ddd747` |  |
| Entropy of formation; _printed: ΔfusS_ | 10.8 J/mol-atom/K |  | γ | unspecified | [1] Oh 1993; _cites ref. 24_ | Table 3, p. 6, row 13; `ORC-Z7LKGP6XVO.d9fb13` |  |
| Entropy of formation; _printed: ΔfusS_ | 12.8 J/mol-atom/K | 298.15 | γ | model | [1] Oh 1993 | Table 3, p. 6, row 12; `ORC-E7XW5WJGMD.4c8ddb` |  |

### Other property (3)

Table: Other property, Te–Tl system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Transition enthalpy; _printed: ΔfusH_ | 8670 J/g-atom |  | γ | unspecified | [1] Oh 1993; _cites ref. 28_ | Table 3, p. 6, row 14; `ORC-XWZHDUVAST.732fc8` |  |
| Transition enthalpy; _printed: ΔfusH_ | 7810 J/g-atom |  | γ | unspecified | [1] Oh 1993; _cites ref. 24_ | Table 3, p. 6, row 13; `ORC-Z7LKGP6XVO.06945d` |  |
| Transition enthalpy; _printed: ΔfusH_ | 9241 J/g-atom | 298.15 | γ | model | [1] Oh 1993 | Table 3, p. 6, row 12; `ORC-E7XW5WJGMD.9b7792` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. C. S. Oh, D. N. Lee, Assessment of the Te-Tl (tellurium-thallium) system, JPE 14, 197-204 (1993). [doi:10.1007/bf02667808](https://doi.org/10.1007/bf02667808)
2. Wojciech Gierlotka, Thermodynamic Description of the Te-Tl Binary System Using the Associate Solution Model, Journal of Elec Materi 39, 1319-1325 (2010). [doi:10.1007/s11664-010-1248-7](https://doi.org/10.1007/s11664-010-1248-7)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- 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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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); 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.

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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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 ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).