# Sr system

> Sr system: 25 accepted literature values (crystal structure 18, invariant reaction 3, formation 2, other property 2) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

25 accepted literature values from 7 paper(s) (experimental 6, model 6, DFT 3, unspecified 10); 0 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/SR.json) · [CSV](https://data.orchid-project.org/systems/SR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SR) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SR.html) · [Markdown](https://data.orchid-project.org/systems/SR.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 6 |
| model | 6 |
| DFT | 3 |
| unspecified | 10 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 3 |
| formation | 2 |
| crystal structure | 18 |
| other property | 2 |

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Sr system (3)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 820.15 | polymorphic: (αSr)->(βSr) |  | model | [1] Wang 2003 | Table 1, p. 2, row 33; `ORC-HTGIJOIXOZ` |  |
| 820.15 | polymorphic: (αSr)->(βSr) |  | model | [1] Wang 2003; _cites Du 2002_ | Table 1, p. 2, row 32; `ORC-K6HKOY7T7R` |  |
| 820.15 | polymorphic: (αSr)->(βSr) |  | experimental | [1] Wang 2003; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 1, p. 2, row 31; `ORC-RCXSMG3P2T` |  |

## 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, Sr system (2)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Sr2Sr-C14 |  | 7.2511 kJ/mol-atom | 0 | unspecified |  |  | [2] Zhong 2006 | Table 2, p. 4, row 21; `ORC-RQ55AFCRKN.717e35` |  |
| fcc-Sr |  | 0 kJ/mol-atom | 0 | unspecified |  |  | [2] Zhong 2006 | Table 2, p. 4, row 23; `ORC-DOEYMK3VQU.b8835b` |  |

## Other properties

### Crystal structure (18)

Table: Crystal structure, Sr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 6.027 Å | 0 | (αSr); _alloy: Sr 1_ | DFT | [3] Li 2013 | Table 1, p. 2, row 9; `ORC-NQIJXF4SO6` |  |
| Lattice a | 4.745 Å | 0 | (βSr); _alloy: Sr 1_ | DFT | [3] Li 2013 | Table 1, p. 2, row 11; `ORC-L6FGRFDWTW` |  |
| Lattice a; _printed: a_ | 7.814 Å | 0 | Sr2Sr-C14; _alloy: Sr 1_ | unspecified | [2] Zhong 2006 | Table 2, p. 4, row 21; `ORC-Y36R4BP6LS.769570` |  |
| Lattice a; _printed: a (=b=c)_ | 5.996 Å | 0 | fcc-Sr; _alloy: Sr 1_ | unspecified | [2] Zhong 2006 | Table 2, p. 4, row 23; `ORC-KZM2BXSYZE.ab157e` |  |
| Lattice a | 6.084 Å | 273.5 | fcc (αSr); _fcc (αSr): _ | unspecified | [4] Smith 1988; _cites ref. 2_ | Table I, p. 2, row 3; `ORC-26VKSVNYGV` |  |
| Lattice a | 6.023 Å | 298.15 | (αSr); _alloy: Sr 1_ | unspecified | [5] Wang 2014 | Table 1, p. 2, row 4; `ORC-2GGDVSH3QM` |  |
| Lattice a | 6.076 Å | 298.15 | (αSr); _alloy: Sr 1_ | unspecified | [5] Wang 2014 | Table 1, p. 2, row 3; `ORC-7552A6G3HS` |  |
| Lattice a | 6.082 Å | 298.15 | (αSr); _alloy: Sr 1_ | experimental | [3] Li 2013; _cites Bruzzone 1966_ | Table 1, p. 2, row 8; `ORC-75JN34S2BB` |  |
| Lattice a | 4.84 Å | 298.15 | (βSr); _alloy: Sr 1_ | experimental | [3] Li 2013; _cites Wang 1962_ [doi](https://doi.org/10.1021/j100817a015) | Table 1, p. 2, row 10; `ORC-DUBGCTFS72` |  |
| Lattice a | 4.87 Å | 298.15 | (βSr); _alloy: Sr 1_ | unspecified | [5] Wang 2014 | Table 1, p. 2, row 5; `ORC-LUOFKSTRRS` |  |
| Lattice a | 6.028 Å | 298.15 | fcc-Sr; _alloy: Sr 1_ | DFT | [6] Zhou 2014 | Table 2, p. 4, row 9; `ORC-2AVZ42W4M3` |  |
| Lattice a | 6.084 Å | 298.15 | fcc-Sr; _alloy: Sr 1_ | experimental | [6] Zhou 2014; _cites Villars 2004_ [doi](https://doi.org/10.4028/www.scientific.net/msf.443-444.357) | Table 2, p. 4, row 7; `ORC-PMIZ3GUNQP` |  |
| Lattice a | 4.87 Å | 658 | bcc (βSr); _bcc (βSr): _ | unspecified | [4] Smith 1988; _cites ref. 2_ | Table I, p. 2, row 4; `ORC-Y2WBEPJKEB` |  |
| Lattice a | 6.084 Å | 820 (\<) | (αSr); _alloy: Sr 1_ | model | [7] Chen 2012; _cites King 1981_ [doi](https://doi.org/10.1007/bf02868307) | Table 2, p. 2, row 6; `ORC-UB4M26JPCB` |  |
| Lattice a | 4.87 Å | 1050 (\<) | (βSr); _alloy: Sr 1_ | model | [7] Chen 2012; _cites Massalski 1986_ | Table 2, p. 2, row 7; `ORC-XPUENI5DLN` |  |
| Lattice c; _printed: c_ | 12.84 Å | 0 | Sr2Sr-C14; _alloy: Sr 1_ | unspecified | [2] Zhong 2006 | Table 2, p. 4, row 21; `ORC-Y36R4BP6LS.b23930` |  |
| volume; _printed: V_ | 54.54 Å3/atom | 0 | fcc-Sr; _alloy: Sr 1_ | model | [6] Zhou 2014 | Table 3, p. 4, row 5; `ORC-3AHMXPM4R5.647914` |  |
| volume; _printed: V_ | 56.3 Å3/atom |  | fcc-Sr; _alloy: Sr 1_ | experimental | [6] Zhou 2014; _cites Anderson 1990_ [doi](https://doi.org/10.1103/physrevb.41.3329) | Table 3, p. 4, row 6; `ORC-LUXDAUMY2C.39bf98` |  |

### Other property (2)

Table: Other property, Sr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| bulk modulus; _printed: B_ | 11.443 GPa | 0 | fcc-Sr; _alloy: Sr 1_ | model | [6] Zhou 2014 | Table 3, p. 4, row 5; `ORC-3AHMXPM4R5.6eec5a` |  |
| bulk modulus; _printed: B_ | 11.88 GPa |  | fcc-Sr; _alloy: Sr 1_ | experimental | [6] Zhou 2014; _cites Anderson 1990_ [doi](https://doi.org/10.1103/physrevb.41.3329) | Table 3, p. 4, row 6; `ORC-LUXDAUMY2C.00c599` |  |

## Sources

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

1. Chong Wang, Zhanpeng Jin, Yong Du, Thermodynamic modeling of the Al–Sr system, Journal of Alloys and Compounds 358, 288-293 (2003). [doi:10.1016/s0925-8388(03)00046-x](https://doi.org/10.1016/s0925-8388%2803%2900046-x)
2. Yu Zhong, Jorge O. Sofo, Alan A. Luo, Zi-Kui Liu, Thermodynamics modeling of the Mg–Sr and Ca–Mg–Sr systems, Journal of Alloys and Compounds 421, 172-178 (2006). [doi:10.1016/j.jallcom.2005.09.076](https://doi.org/10.1016/j.jallcom.2005.09.076)
3. Xi Li, Kaiming Cheng, Xiaoming Yuan, Dongdong Zhao, Jinghua Xin, Weiwei Wang et al., Thermodynamic assessment of the Ga–X (X=B, Ca, Sr, Ba) systems supported by first-principles calculations, Calphad 43, 52-60 (2013). [doi:10.1016/j.calphad.2013.09.002](https://doi.org/10.1016/j.calphad.2013.09.002)
4. J. F. Smith, K. J. Lee, The Ca−V (Calcium-Vanadium), Sr−V (strontium-Vandadium), and Ba−V (Barium-Vanadium) systems, Bulletin of Alloy Phase Diagrams 9, 466-469 (1988). [doi:10.1007/bf02881868](https://doi.org/10.1007/bf02881868)
5. Yao Wang, Jinghua Xin, Chong Chen, Shuhong Liu, Biao Hu, Yong Du, Thermodynamic assessment of the Sr–In and Sr–Bi systems supported by first-principles calculations, Calphad 45, 49-54 (2014). [doi:10.1016/j.calphad.2013.12.001](https://doi.org/10.1016/j.calphad.2013.12.001)
6. Bi-Cheng Zhou, Shun-Li Shang, Zi-Kui Liu, First-principles calculations and thermodynamic modeling of the Sn−Sr and Mg−Sn−Sr systems, Calphad 46, 237-248 (2014). [doi:10.1016/j.calphad.2014.04.003](https://doi.org/10.1016/j.calphad.2014.04.003)
7. 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 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/).