# H–La–Ni system

> H–La–Ni system: 17 accepted literature values (formation 16, crystal structure 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/H-LA-NI.html · Markdown: https://data.orchid-project.org/systems/H-LA-NI.md

17 accepted literature values from 2 paper(s) (experimental 12, model 3, DFT 1, unspecified 1); 0 calculated phase diagram(s). 2 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/H-LA-NI.json) · [CSV](https://data.orchid-project.org/systems/H-LA-NI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#H-LA-NI) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/H-LA-NI.html) · [Markdown](https://data.orchid-project.org/systems/H-LA-NI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 12 |
| model | 3 |
| DFT | 1 |
| unspecified | 1 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| formation | 16 |
| crystal structure | 1 |

## 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, H–La–Ni system (16)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| LaHx |  | -63.7 kJ/mol-atom | 917 | experimental |  |  | [1] Palumbo 2009; _cites Dantzer 1980_ [doi](https://doi.org/10.1016/0022-4596%2880%2990460-0) | Table 1, p. 2, row 2; `ORC-FA7TKQINZH.cfffcb` |  |
| LaHx |  | -63.6 kJ/mol-atom | 917 | model |  |  | [1] Palumbo 2009 | Table 1, p. 2, row 1; `ORC-4DQ257INVD.469618` |  |
| LaNi5Hx |  | -21 kJ/mol-atom | 298.15 | DFT |  |  | [1] Palumbo 2009; _cites Hector 2003_ [doi](https://doi.org/10.1016/s0925-8388%2802%2901324-5) | Table 1, p. 2, row 20; `ORC-YK2HTRFWHQ.c457ce` |  |
| LaNi5Hx |  | -20.1 kJ/mol-atom | 223.5 | model |  |  | [1] Palumbo 2009; _cites Ohlendorf 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990339-2) | Table 1, p. 2, row 10; `ORC-WX4FYXW73S.053661` |  |
| LaNi5Hx |  | -20 kJ/mol-atom | 285 | experimental |  |  | [1] Palumbo 2009; _cites Murray 1981_ [doi](https://doi.org/10.1016/0022-5088%2881%2990093-x) | Table 1, p. 2, row 18; `ORC-CTW3FJLLWT.2963bf` |  |
| LaNi5Hx |  | -19.9 kJ/mol-atom | 320.5 | model |  |  | [1] Palumbo 2009 | Table 1, p. 2, row 11; `ORC-Q2OTG3AERZ.d2deaf` |  |
| LaNi5Hx |  | -19.7 kJ/mol-atom | 298.15 | experimental |  |  | [1] Palumbo 2009; _cites Hubbard 1980_ | Table 1, p. 2, row 19; `ORC-DBA3SFB3DP.b7a4cd` |  |
| LaNi5Hx |  | -19.6 kJ/mol-atom | 296.5 | experimental |  |  | [1] Palumbo 2009; _cites Biris 2009_ | Table 1, p. 2, row 13; `ORC-LYT4UMHIWR.f5a83b` |  |
| LaNi5Hx |  | -19.6 kJ/mol-atom | 273.15 | experimental |  |  | [1] Palumbo 2009; _cites Ohlendorf 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990339-2) | Table 1, p. 2, row 15; `ORC-WTKDHIUCPR.6e7989` |  |
| LaNi5Hx |  | -19.4 kJ/mol-atom | 298.15 | experimental |  |  | [1] Palumbo 2009; _cites Ohlendorf 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990339-2) | Table 1, p. 2, row 14; `ORC-TKY4CFSFMA.e5ca77` |  |
| LaNi5Hx |  | -19.3 kJ/mol-atom | 296 | experimental |  |  | [1] Palumbo 2009; _cites Pedziwiatr 1983_ [doi](https://doi.org/10.1016/0022-4596%2883%2990158-5) | Table 1, p. 2, row 17; `ORC-ZVV65OJWFZ.a4c65a` |  |
| LaNi5Hx |  | -19.2 kJ/mol-atom | 298.15 | experimental |  |  | [1] Palumbo 2009; _cites Bowerman 1979_ [doi](https://doi.org/10.1524/zpch.1979.116.116.197) | Table 1, p. 2, row 7; `ORC-FTCEPKQCSG.c34357` |  |
| LaNi5Hx |  | -19.1 kJ/mol-atom | 195 | experimental |  |  | [1] Palumbo 2009; _cites Ohlendorf 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990339-2) | Table 1, p. 2, row 16; `ORC-3XODHVZRDP.444317` |  |
| LaNi5Hx |  | -19 kJ/mol-atom | 324 | experimental |  |  | [1] Palumbo 2009; _cites J 1970_ | Table 1, p. 2, row 9; `ORC-6QJPH4UGHG.831373` |  |
| LaNi5Hx |  | -18.8 kJ/mol-atom | 363 | experimental |  |  | [1] Palumbo 2009; _cites H 1976_ | Table 1, p. 2, row 8; `ORC-2IMBHWVO7H.772af2` |  |
| LaNi5Hx |  | -18.8 kJ/mol-atom | 320.5 | experimental |  |  | [1] Palumbo 2009; _cites Anderson 1973_ | Table 1, p. 2, row 12; `ORC-FSIWRNZD3C.8f2f31` |  |

## Other properties

### Crystal structure (1)

Table: Crystal structure, H–La–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 5.409 Å | 298.15 | LaNi5H7; _alloy: La 0.076923, Ni 0.384615_ | unspecified | [2] An 2013 | Table 3, p. 5, row 16; `ORC-T5VP3EWGU5.4e0748` |  |

## Sources

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

1. M. Palumbo, J. Urgnani, D. Baldissin, L. Battezzati, M. Baricco, Thermodynamic assessment of the H–La–Ni system, Calphad 33, 162-169 (2009). [doi:10.1016/j.calphad.2008.09.003](https://doi.org/10.1016/j.calphad.2008.09.003)
2. 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)

## 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=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).