# SrH2: enthalpy of formation

> Enthalpy of formation of SrH2: 5 literature value(s) with sources, pages and quotes, from ORCHID.

HTML: https://data.orchid-project.org/compounds/SrH2.html · Markdown: https://data.orchid-project.org/compounds/SrH2.md

5 accepted literature formation-enthalpy value(s) (experimental 5).

Systems: [H–Sr](https://data.orchid-project.org/systems/H-SR.html)

## Literature values

Table: Enthalpy of formation of SrH2 reported in the literature (5)

| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---:|---|---:|---|---|---|---|---|---|
| -197 kJ/mol (basis unstated) | αSrH2 | 298.15 | experimental | Evaluation of H2 equilibrium pressure | [H–Sr](https://data.orchid-project.org/systems/H-SR.html) | [1] Chen 2012; _cites Banus 1957_ | Table 1, p. 2, row 3; `ORC-RKAXWPMAGC` |  |
| -189 kJ/mol (basis unstated) ± 8 | βSrH2 | 298.15 | experimental | Evaluation of H2 equilibrium pressure | [H–Sr](https://data.orchid-project.org/systems/H-SR.html) | [1] Chen 2012; _cites Peterson 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990144-7) | Table 1, p. 2, row 5; `ORC-5NWDXOAIKQ` |  |
| -183 kJ/mol (basis unstated) ± 3 | αSrH2 | 298.15 | experimental | Evaluation of H2 equilibrium pressure | [H–Sr](https://data.orchid-project.org/systems/H-SR.html) | [1] Chen 2012; _cites Peterson 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990144-7) | Table 1, p. 2, row 4; `ORC-5K5PZAPHMK` |  |
| -180 kJ/mol (basis unstated) | αSrH2 | 298.15 | experimental | Calorimetric method | [H–Sr](https://data.orchid-project.org/systems/H-SR.html) | [1] Chen 2012; _cites Ehrlich 1963_ [doi](https://doi.org/10.1002/zaac.19633240302) | Table 1, p. 2, row 2; `ORC-FEBDULZVHP` |  |
| -176 kJ/mol (basis unstated) | αSrH2 | 298.15 | experimental | Calorimetric method | [H–Sr](https://data.orchid-project.org/systems/H-SR.html) | [1] Chen 2012; _cites Guntz 1923_ | Table 1, p. 2, row 1; `ORC-TWLMF7PKMO` |  |

### Uncertainty budget

Components kept separate, in the value's unit (literature [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md), [UNCERTAINTY_CALIBRATION.md](https://data.orchid-project.org/literature/UNCERTAINTY_CALIBRATION.md)): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.

Table: Uncertainty budget of the literature values of SrH2

| Value | Unit | Printed | Reading | Method (class, basis) | Composition | Scatter | Conversion | Effective |
|---:|---|---:|---:|---|---:|---:|---:|---:|
| -197 | kJ/mol (basis unstated) |  | 0.5 | 10.5 (evaluated_compilation, calibrated) |  |  |  | 10.5 |
| -189 | kJ/mol (basis unstated) | 8 | 0.5 | 10.5 (evaluated_compilation, calibrated) |  |  |  | 10.5 |
| -183 | kJ/mol (basis unstated) | 3 | 0.5 | 10.5 (evaluated_compilation, calibrated) |  |  |  | 10.5 |
| -180 | kJ/mol (basis unstated) |  | 0.5 | 9.6 (solution_reaction_calorimetry, calibrated) |  |  |  | 9.6 |
| -176 | kJ/mol (basis unstated) |  | 0.5 | 9.6 (solution_reaction_calorimetry, calibrated) |  |  |  | 9.6 |

## Sources

1. Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012). [doi:10.1016/j.calphad.2012.03.001](https://doi.org/10.1016/j.calphad.2012.03.001)

## 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-Parity: DFT-vs-experiment formation-enthalpy benchmark (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735943
- 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); G. Kim, S. V. Meschel, P. Nash, W. Chen, Experimental formation enthalpies for intermetallic phases and other inorganic compounds, Scientific Data 4 (2017) 170162, https://doi.org/10.1038/sdata.2017.162; 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_dft_benchmark_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735943},
  url       = {https://doi.org/10.5281/zenodo.23735943},
  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/).