# La system > La system: 26 accepted literature values (crystal structure 18, invariant reaction 4, phase transition 3, formation 1) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/LA.html · Markdown: https://data.orchid-project.org/systems/LA.md 26 accepted literature values from 8 paper(s) (experimental 11, model 4, DFT 1, unspecified 10); 0 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/LA.json) · [CSV](https://data.orchid-project.org/systems/LA.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#LA) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/LA.html) · [Markdown](https://data.orchid-project.org/systems/LA.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 11 | | model | 4 | | DFT | 1 | | unspecified | 10 | Table: Accepted values by property group | Property group | Values | |---|---:| | invariant reaction | 4 | | phase transition | 3 | | formation | 1 | | crystal structure | 18 | ## Invariant reactions (literature) Table: Invariant reactions reported in the literature for the La system (4) | T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote | |---:|---|---|---|---|---|---| | 1138 | γLa->βLa (fcc) | | experimental | [1] Huang 2000; _cites Eremenko 1988_ | Table 1, p. 2, row 4; `ORC-7MRZKZ5IGY` | | | 1134 | γLa->βLa (fcc) | | model | [1] Huang 2000; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 1, p. 2, row 3; `ORC-PA7XXMYDIK` | | | 583 | βLa->αLa (dhcp) | | experimental | [1] Huang 2000; _cites Eremenko 1988_ | Table 1, p. 2, row 6; `ORC-YZKHY65QKO` | | | 550 | βLa->αLa (dhcp) | | model | [1] Huang 2000; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 1, p. 2, row 5; `ORC-DYW5H5WNVW` | | ## 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, La system (1) | Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote | |---|---|---:|---:|---|---:|---:|---|---|---| | La | | 0 kJ/mol-atom | 0 | DFT | | | [2] Zhou 2006 | Table 3, p. 6, row 28; `ORC-O62YLDXJZW` | | ## Other properties ### Phase transition (3) Table: Phase transition, La system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Phase transition | 550.05 K | 550.05 | (βLa) ↔ (αLa); _(βLa): ; (αLa): _ | experimental | [3] Wang 2012; _cites This_ | Table 2, p. 4, row 11; `ORC-HTBSEYZFRY` | | | Phase transition | 550.05 K | 550.05 | (βLa) ↔ (αLa); _(βLa): ; (αLa): _ | model | [3] Wang 2012 | Table 2, p. 4, row 12; `ORC-RY7Z6MFDXV` | | | Phase transition | 992.3 K | 992.3 | polymorphic: La; _alloy: La 1_ | model | [4] Norgren 2000; _cites Norgren_ | Table 1, p. 4, row 1; `ORC-ITYYK7ADET` | | ### Crystal structure (18) Table: Crystal structure, La system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Lattice a | 5.29 Å | | (β La); _alloy: La 1_ | experimental | [5] Peng 2011; _cites Eliseev 1964_ | Table 1, p. 2, row 2; `ORC-VFKRVTIS5U` | | | Lattice a | 4.29 Å | | Bcc(La); _alloy: La 1_ | experimental | [6] Tang 2013; _cites Villars 2013_ | Table 2, p. 3, row 1; `ORC-4WOPPHI3VN` | | | Lattice a | 4.25 Å | 0 | Bcc(La); _alloy: La 1_ | unspecified | [6] Tang 2013 | Table 2, p. 3, row 2; `ORC-4Z3RS6UDA5` | | | Lattice a | 3.772 Å | | Dhcp(La); _alloy: La 1_ | experimental | [6] Tang 2013; _cites Villars 2013_ | Table 2, p. 3, row 5; `ORC-FSHF4YPOK2.2ed3d6` | | | Lattice a | 3.762 Å | 0 | Dhcp(La); _alloy: La 1_ | unspecified | [6] Tang 2013 | Table 2, p. 3, row 6; `ORC-QNYBAAPC5N.403095` | | | Lattice a | 5.29 Å | | Fcc(La); _alloy: La 1_ | experimental | [6] Tang 2013; _cites Villars 2013_ | Table 2, p. 3, row 3; `ORC-IIW7WDBF5P` | | | Lattice a | 5.26 Å | 0 | Fcc(La); _alloy: La 1_ | unspecified | [6] Tang 2013 | Table 2, p. 3, row 4; `ORC-LQVY3E3XEO` | | | Lattice a | 3.77 Å | 298.15 | (α La); _alloy: La 1_ | experimental | [5] Peng 2011; _cites Spedding 1961_ [doi](https://doi.org/10.1016/0022-5088%2861%2990003-0) | Table 1, p. 2, row 1; `ORC-BH2BR67WST.5c3cf1` | | | Lattice a | 3.77 Å | 298.15 | (αLa); _alloy: La 1_ | unspecified | [7] An 2013 | Table 3, p. 5, row 1; `ORC-QCWR5ZUBE5.4c3bc3` | | | Lattice a | 3.77 Å | 298.15 | (αLa); _alloy: La 1_ | unspecified | [8] An 2012 | Table 2, p. 5, row 1; `ORC-U5OILHXQAI` | | | Lattice a | 5.303 Å | 298.15 | (βLa); _alloy: La 1_ | unspecified | [8] An 2012 | Table 2, p. 5, row 3; `ORC-BKGOQKUHS2` | | | Lattice a | 5.303 Å | 298.15 | (βLa); _alloy: La 1_ | unspecified | [7] An 2013 | Table 3, p. 5, row 3; `ORC-HMBT7SSS3P.9966f9` | | | Lattice a | 4.26 Å | 298.15 | (γ La); _alloy: La 1_ | experimental | [5] Peng 2011; _cites Spedding 1961_ [doi](https://doi.org/10.1016/0022-5088%2861%2990003-0) | Table 1, p. 2, row 3; `ORC-AMACLL5RQJ` | | | Lattice a | 4.26 Å | 298.15 | (γLa); _alloy: La 1_ | unspecified | [8] An 2012 | Table 2, p. 5, row 2; `ORC-56UZK7M7E4` | | | Lattice a | 4.26 Å | 298.15 | (γLa); _alloy: La 1_ | unspecified | [7] An 2013 | Table 3, p. 5, row 2; `ORC-PI5VNYHN6E.35ecac` | | | Lattice c | 12.144 Å | | Dhcp(La); _alloy: La 1_ | experimental | [6] Tang 2013; _cites Villars 2013_ | Table 2, p. 3, row 5; `ORC-FSHF4YPOK2.36b282` | | | Lattice c | 12.078 Å | 0 | Dhcp(La); _alloy: La 1_ | unspecified | [6] Tang 2013 | Table 2, p. 3, row 6; `ORC-QNYBAAPC5N.f30213` | | | Lattice c | 12.13 Å | 298.15 | (α La); _alloy: La 1_ | experimental | [5] Peng 2011; _cites Spedding 1961_ [doi](https://doi.org/10.1016/0022-5088%2861%2990003-0) | Table 1, p. 2, row 1; `ORC-BH2BR67WST.19667c` | | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. Minhwa Huang, Xuping Su, Fucheng Yin, Ping Zhang, Zhi Li, Chuntao Chen, A thermodynamic assessment of the La–Sn system, Journal of Alloys and Compounds 309, 147-153 (2000). [doi:10.1016/s0925-8388(00)01077-x](https://doi.org/10.1016/s0925-8388%2800%2901077-x) 2. S.H. Zhou, R.E. Napolitano, Phase equilibria and thermodynamic limits for partitionless crystallization in the Al–La binary system, Acta Materialia 54, 831-840 (2006). [doi:10.1016/j.actamat.2005.10.013](https://doi.org/10.1016/j.actamat.2005.10.013) 3. Y. Wang, B. Hu, S. Liu, Y. Du, Thermodynamic reassessment of the La-Mn system, J min metall B Metall 48, 391-394 (2012). [doi:10.2298/jmmb120717049w](https://doi.org/10.2298/jmmb120717049w) 4. 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) 5. Yingbiao Peng, Yong Du, Lijun Zhang, Chunsheng Sha, Shuhong Liu, Feng Zheng et al., Thermodynamic modeling of the C–RE (RE=La, Ce and Pr) systems, Calphad 35, 533-541 (2011). [doi:10.1016/j.calphad.2011.09.002](https://doi.org/10.1016/j.calphad.2011.09.002) 6. Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013). [doi:10.1007/s11669-013-0231-4](https://doi.org/10.1007/s11669-013-0231-4) 7. X.H. An, Q.F. Gu, J.Y. Zhang, S.L. Chen, X.B. Yu, Q. Li, Experimental investigation and thermodynamic reassessment of La–Ni and LaNi5–H systems, Calphad 40, 48-55 (2013). [doi:10.1016/j.calphad.2012.12.002](https://doi.org/10.1016/j.calphad.2012.12.002) 8. Xuehui An, Qian Li, Jieyu Zhang, Shuanglin Chen, Ying Yang, Phase equilibria of the La–Ni–Cu ternary system at 673 K: Thermodynamic modeling and experimental validation, Calphad 36, 8-15 (2012). [doi:10.1016/j.calphad.2011.10.004](https://doi.org/10.1016/j.calphad.2011.10.004) ## 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/).