# Tb system > Tb system: 13 accepted literature values (phase transition 7, crystal structure 6) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/TB.html · Markdown: https://data.orchid-project.org/systems/TB.md 13 accepted literature values from 3 paper(s) (experimental 5, model 5, DFT 3); 0 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/TB.json) · [CSV](https://data.orchid-project.org/systems/TB.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#TB) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/TB.html) · [Markdown](https://data.orchid-project.org/systems/TB.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 5 | | model | 5 | | DFT | 3 | Table: Accepted values by property group | Property group | Values | |---|---:| | phase transition | 7 | | crystal structure | 6 | ## Other properties ### Phase transition (7) Table: Phase transition, Tb system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Phase transition | 1562 K | 1562 | polymorphic: Tb; _alloy: Tb 1_ | model | [1] Norgren 2000; _cites Saunders 1998_ | Table 1, p. 4, row 15; `ORC-272WAW3VJL` | | | Phase transition | 1562 K | 1562 | polymorphic: Tb; _alloy: Tb 1_ | model | [1] Norgren 2000; _cites Norgren_ | Table 1, p. 4, row 14; `ORC-NSY6BRPS5M` | | | Phase transition | 1562 K | 1562 | polymorphic: αTb -> βTb; _αTb: Tb 1_ | experimental | [2] Otmani 2016; _cites Saccone 2000_ [doi](https://doi.org/10.1016/s0966-9795%2899%2900099-0) | Table 1, p. 3, row 3; `ORC-PY6WL2VZT7` | | | Phase transition | 1562 K | 1562 | polymorphic: αTb -> βTb; _αTb: Tb 1_ | model | [2] Otmani 2016 | Table 1, p. 3, row 4; `ORC-TS7S4PG5PP` | | | Phase transition | 1591 K | 1591 | polymorphic: Tb; _alloy: Tb 1_ | model | [1] Norgren 2000; _cites Huasen 1995_ | Table 1, p. 4, row 16; `ORC-7XOOD5WMYJ` | | | Phase transition | 1629 K | 1629 | congruent melting: L -> βTb; _L: Tb 1_ | model | [2] Otmani 2016 | Table 1, p. 3, row 2; `ORC-MELIUPQTTA` | | | Phase transition | 1629 K | 1629 | congruent melting: L -> βTb; _L: Tb 1_ | experimental | [2] Otmani 2016; _cites Saccone 2000_ [doi](https://doi.org/10.1016/s0966-9795%2899%2900099-0) | Table 1, p. 3, row 1; `ORC-ZLWPJECE6K` | | ### Crystal structure (6) Table: Crystal structure, Tb system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Lattice a | 3.67 Å | 0 | (α-Tb); _alloy: Tb 1_ | DFT | [3] Rahou 2024 | Table 1, p. 4, row 1; `ORC-AKFMVYF6FJ.7c4789` | | | Lattice a | 4.02 Å | | (β-Tb); _alloy: Tb 1_ | experimental | [3] Rahou 2024; _cites Gschneidner 1986_ | Table 1, p. 4, row 4; `ORC-SNFYK6UCCL` | | | Lattice a | 4.02 Å | 0 | (β-Tb); _alloy: Tb 1_ | DFT | [3] Rahou 2024 | Table 1, p. 4, row 3; `ORC-U5PJ46BCSI` | | | Lattice a | 3.61 Å | 298.15 | (α-Tb); _alloy: Tb 1_ | experimental | [3] Rahou 2024; _cites Gschneidner 1986_ | Table 1, p. 4, row 2; `ORC-JKHB3PAPHI.71a247` | | | Lattice c | 5.6 Å | 0 | (α-Tb); _alloy: Tb 1_ | DFT | [3] Rahou 2024 | Table 1, p. 4, row 1; `ORC-AKFMVYF6FJ.df9b3a` | | | Lattice c | 5.69 Å | 298.15 | (α-Tb); _alloy: Tb 1_ | experimental | [3] Rahou 2024; _cites Gschneidner 1986_ | Table 1, p. 4, row 2; `ORC-JKHB3PAPHI.6443e9` | | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. Susanne Norgren, Thermodynamic assessment of the Ho-Tb, Ho-Dy, Ho-Er, Er-Tb, and Er-Dy systems, JPE 21, 148-156 (2000). [doi:10.1361/105497100770340200](https://doi.org/10.1361/105497100770340200) 2. Samira Otmani, Kamal Mahdouk, Thermodynamic assessment of the terbium–gold binary system, Journal of Alloys and Compounds 670, 369-373 (2016). [doi:10.1016/j.jallcom.2016.01.260](https://doi.org/10.1016/j.jallcom.2016.01.260) 3. Z. Rahou, D. Moustaine, Y. Ben-Ali, A. Hallaoui, CALPHAD-Based Thermodynamic Reassessment of Tb-Ni Binary System Supported by Ab-Initio Calculations, J. Phase Equilib. Diffus. 45, 75-85 (2024). [doi:10.1007/s11669-024-01089-9](https://doi.org/10.1007/s11669-024-01089-9) ## 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 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_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=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).