# Co–Th system

> Co–Th system: 41 accepted literature values (invariant reaction 41) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/CO-TH.html · Markdown: https://data.orchid-project.org/systems/CO-TH.md

41 accepted literature values from 1 paper(s) (experimental 27, model 14); 1 calculated phase diagram(s). 4 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/CO-TH.json) · [CSV](https://data.orchid-project.org/systems/CO-TH.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-TH) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-TH/CoTh-08Wan.json) · [phases (10)](https://data.orchid-project.org/phases/pages/CO-TH.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-TH.html) · [Markdown](https://data.orchid-project.org/systems/CO-TH.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 27 |
| model | 14 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 41 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| CoTh-08Wan.tdb | C.P. Wang, P. Yu, X.J. Liu, I. Ohnuma, R. Kainuma, K. Ishida, J. Alloys Compd., 457, 150-56(2008). [doi:10.1016/j.jallcom.2007.03.003](https://doi.org/10.1016/j.jallcom.2007.03.003) | `97db96e3dea38a8a099b345f73c87e368aa88b82854de7a13e784c6b26276be6` | [viewer](https://orchid-project.org/phase-diagrams/#CO-TH/CoTh-08Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoTh-08Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoTh-08Wan.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoTh-08Wan.tdb | 1697.6 | CO17TH2 (x(Th) 0.10526) + LIQUID (x(Th) 0.15764) + CO5TH_D2D (x(Th) 0.16667) |
| CoTh-08Wan.tdb | 1697.6 | CO17TH2 (x(Th) 0.10526) + LIQUID (x(Th) 0.15753) + CO5TH_D2D (x(Th) 0.16667) |
| CoTh-08Wan.tdb | 1679.46 | FCC_A1 (x(Th) 0) + LIQUID (x(Th) 0.0437) + CO17TH2 (x(Th) 0.10526) |
| CoTh-08Wan.tdb | 1633.2 | LIQUID (x(Th) 0.8737) + BCC_A2 (x(Th) 0.99999) + FCC_A1 (x(Th) 0.99999) |
| CoTh-08Wan.tdb | 1633.2 | LIQUID (x(Th) 0.87385) + FCC_A1 (x(Th) 0.99999) + BCC_A2 (x(Th) 0.99999) |
| CoTh-08Wan.tdb | 1357.73 | CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.79286) + FCC_A1 (x(Th) 1) |
| CoTh-08Wan.tdb | 1357.73 | CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.79279) + FCC_A1 (x(Th) 1) |
| CoTh-08Wan.tdb | 1357.73 | CO3TH7_D102 (x(Th) 0.7) + LIQUID (x(Th) 0.7929) + FCC_A1 (x(Th) 1) |
| CoTh-08Wan.tdb | 1298.24 | COTH_B33 (x(Th) 0.5) + LIQUID (x(Th) 0.58761) + CO3TH7_D102 (x(Th) 0.7) |
| CoTh-08Wan.tdb | 1298.24 | COTH_B33 (x(Th) 0.5) + LIQUID (x(Th) 0.58775) + CO3TH7_D102 (x(Th) 0.7) |
| CoTh-08Wan.tdb | 1233.31 | CO7TH2_ALPHA (x(Th) 0.22222) + LIQUID (x(Th) 0.3948) + COTH_B33 (x(Th) 0.5) |
| CoTh-08Wan.tdb | 694.99 | FCC_A1 (x(Th) 0) + HCP_A3 (x(Th) 0) + CO17TH2 (x(Th) 0.10526) |
| CoTh-08Wan.tdb | 400.45 | CO17TH2 (x(Th) 0.10526) + CO5TH_D2D (x(Th) 0.16667) + CO7TH2_ALPHA (x(Th) 0.22222) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-TH.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-TH.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Th system (41)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1768.15 | congruent melting: L \<-> αCo | L: Th 0; αCo: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 39; `ORC-HPQQANFDLP` |  |
| 1768.15 | congruent melting: L \<-> αCo | L: Th 0; αCo: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 40; `ORC-YYDEE5TVLQ` |  |
| 1766.85 | congruent melting: L \<-> αCo | L: Th 0; αCo: Co 0.777778, Th 0.222222 | model | [1] Wang 2008 | Table 2, p. 3, row 41; `ORC-D27PBIBDKC` |  |
| 1735.15 | congruent melting: L \<-> Co17Th2 | L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 33; `ORC-WFPXJ4ACKJ` |  |
| 1733.65 | congruent melting: L \<-> Co17Th2 | L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263 | model | [1] Wang 2008 | Table 2, p. 3, row 35; `ORC-ETINDOUVSA` |  |
| 1733.15 | congruent melting: L \<-> Co17Th2 | L: Th 0.105; Co17Th2: Co 0.894737, Th 0.105263 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 34; `ORC-42WORZMR6R` |  |
| 1710.15 | congruent melting: L \<-> Co5Th | L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 27; `ORC-72UATHKH3S` |  |
| 1698.35 | congruent melting: L \<-> Co5Th | L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667 | model | [1] Wang 2008 | Table 2, p. 3, row 29; `ORC-NPEIJAURB6` |  |
| 1698.15 | congruent melting: L \<-> Co5Th | L: Th 0.1667; Co5Th: Co 0.833333, Th 0.166667 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 28; `ORC-XDIWKXOSEZ` |  |
| 1696.95 | eutectic: L \<-> Co5Th + Co17Th2 | L: Th 0.1555; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263 | model | [1] Wang 2008 | Table 2, p. 3, row 32; `ORC-SMYZQNYPCP` |  |
| 1683.15 | eutectic: L \<-> Co17Th2 + αCo | L: Th 0.0501; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 37; `ORC-GIKWBNVYZD` |  |
| 1678.05 | eutectic: L \<-> Co17Th2 + αCo | L: Th 0.0456; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222 | model | [1] Wang 2008 | Table 2, p. 3, row 38; `ORC-PAV5GJWPBD` |  |
| 1660.15 | eutectic: L \<-> Co17Th2 + αCo | L: Th 0.0501; Co17Th2: Co 0.894737, Th 0.105263; αCo: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 36; `ORC-QQXFHXO7DI` |  |
| 1633.25 | polymorphic: βTh \<-> αTh | αTh: Co 0.777778, Th 0.222222; L: Th 1 | model | [1] Wang 2008 | Table 2, p. 3, row 6; `ORC-NTX4HSZ7IC` |  |
| 1633.15 | polymorphic: βTh \<-> αTh | αTh: Co 0.777778, Th 0.222222; L: Th 1 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 4; `ORC-2HSQFKHDY5` |  |
| 1633.15 | polymorphic: βTh \<-> αTh | αTh: Co 0.777778, Th 0.222222; L: Th 1 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 5; `ORC-EBYU4THLCK` |  |
| 1573.15 | eutectic: L \<-> Co5Th + Co17Th2 | L: Th 0.1202; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 30; `ORC-7O2BJZAXU2` |  |
| 1573.15 | eutectic: L \<-> Co5Th + Co17Th2 | L: Th 0.1258; Co5Th: Co 0.833333, Th 0.166667; Co17Th2: Co 0.894737, Th 0.105263 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 31; `ORC-LKRK7QYFYM` |  |
| 1461.15 | congruent melting: L \<-> Co3Th7 | L: Th 0.7; Co3Th7: Co 0.3, Th 0.7 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 10; `ORC-XZBQENE6TL` |  |
| 1410.15 | congruent melting: L \<-> CoTh | L: Th 0.5; CoTh: Co 0.5, Th 0.5 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 16; `ORC-MWQIZ7DZXA` |  |
| 1403.15 | congruent melting: L \<-> Co3Th7 | L: Th 0.7; Co3Th7: Co 0.3, Th 0.7 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 11; `ORC-FIPIR5RYAZ` |  |
| 1402.85 | congruent melting: L \<-> Co3Th7 | L: Th 0.7; Co3Th7: Co 0.3, Th 0.7 | model | [1] Wang 2008 | Table 2, p. 3, row 12; `ORC-NV2RAKK5YH` |  |
| 1398.15 | peritectic: L + Co5Th \<-> βCo7Th2 | L: Th 0.3187; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 25; `ORC-BVKCWFS2BU` |  |
| 1398.15 | peritectic: L + Co5Th \<-> βCo7Th2 | L: Th 0.256; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 24; `ORC-J7SVG2D2WP` |  |
| 1398.15 | peritectic: L + Co5Th \<-> βCo7Th2 | L: Th 0.3324; Co5Th: Co 0.833333, Th 0.166667; βCo7Th2: Co 0.777778, Th 0.222222 | model | [1] Wang 2008 | Table 2, p. 3, row 26; `ORC-TBDRLWVL4T` |  |
| 1398.15 | congruent melting: L \<-> CoTh | L: Th 0.5; CoTh: Co 0.5, Th 0.5 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 17; `ORC-XHIFVDA7AQ` |  |
| 1397.95 | congruent melting: L \<-> CoTh | L: Th 0.5; CoTh: Co 0.5, Th 0.5 | model | [1] Wang 2008 | Table 2, p. 3, row 18; `ORC-OY6XMRABGV` |  |
| 1373.25 | polymorphic: βCo7Th2 \<-> αCo7Th2 | βCo7Th2: Co 0.777778, Th 0.222222; αCo7Th2: Co 0.777778, Th 0.222222 | model | [1] Wang 2008 | Table 2, p. 3, row 23; `ORC-DSVNSIF74K` |  |
| 1373.15 | polymorphic: βCo7Th2 \<-> αCo7Th2 | βCo7Th2: Co 0.777778, Th 0.222222; αCo7Th2: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 22; `ORC-EFHTIIL5ZA` |  |
| 1373.15 | eutectic: L \<-> αTh + Co3Th7 | L: Th 0.7961; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 8; `ORC-K7AGJ3EQLP` |  |
| 1373.15 | eutectic: L \<-> αTh + Co3Th7 | L: Th 0.7966; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 7; `ORC-LXDFOERLAM` |  |
| 1358.05 | eutectic: L \<-> αTh + Co3Th7 | L: Th 0.793; αTh: Co 0.777778, Th 0.222222; Co3Th7: Co 0.3, Th 0.7 | model | [1] Wang 2008 | Table 2, p. 3, row 9; `ORC-5Y7W3GUAOP` |  |
| 1310.15 | eutectic: L \<-> Co3Th7 + CoTh | L: Th 0.5976; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 13; `ORC-PMJO36WKBK` |  |
| 1298.45 | eutectic: L \<-> Co3Th7 + CoTh | L: Th 0.5875; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5 | model | [1] Wang 2008 | Table 2, p. 3, row 15; `ORC-IE6JSQD6Y3` |  |
| 1298.15 | eutectic: L \<-> Co3Th7 + CoTh | L: Th 0.619; Co3Th7: Co 0.3, Th 0.7; CoTh: Co 0.5, Th 0.5 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 14; `ORC-5JE4PB4NH5` |  |
| 1248.15 | eutectic: L \<-> CoTh + αCo7Th2 | L: Th 0.3808; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 19; `ORC-X6NKZ45UXL` |  |
| 1233.25 | eutectic: L \<-> CoTh + αCo7Th2 | L: Th 0.3941; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222 | model | [1] Wang 2008 | Table 2, p. 3, row 21; `ORC-XGWAWUWARX` |  |
| 1233.15 | eutectic: L \<-> CoTh + αCo7Th2 | L: Th 0.3907; CoTh: Co 0.5, Th 0.5; αCo7Th2: Co 0.777778, Th 0.222222 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 20; `ORC-27HR6HNCZA` |  |
| 695.15 | polymorphic: αCo \<-> εCo | αCo: Co 0.777778, Th 0.222222; L: Th 0 | experimental | [1] Wang 2008; _cites Palenzona 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990170-7) | Table 2, p. 3, row 43; `ORC-JUCGQY5M4A` |  |
| 695.15 | polymorphic: αCo \<-> εCo | αCo: Co 0.777778, Th 0.222222; L: Th 0 | experimental | [1] Wang 2008; _cites Thomson 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990101-9) | Table 2, p. 3, row 42; `ORC-W4VI3EMFMR` |  |
| 694.95 | polymorphic: αCo \<-> εCo | αCo: Co 0.777778, Th 0.222222; L: Th 0 | model | [1] Wang 2008 | Table 2, p. 3, row 44; `ORC-DOQULGOIVO` |  |

## Sources

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

1. C.P. Wang, P. Yu, X.J. Liu, I. Ohnuma, R. Kainuma, K. Ishida, Thermodynamic assessment of the Co–Th and Fe–Th systems, Journal of Alloys and Compounds 457, 150-156 (2008). [doi:10.1016/j.jallcom.2007.03.003](https://doi.org/10.1016/j.jallcom.2007.03.003)

## 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-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- 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); 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).

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_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@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/).