# Pu–Zr system

> Pu–Zr system: 8 accepted literature values (invariant reaction 5, phase transition 3) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

8 accepted literature values from 1 paper(s) (model 3, unspecified 5); 2 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/PU-ZR.json) · [CSV](https://data.orchid-project.org/systems/PU-ZR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#PU-ZR) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#PU-ZR/PuZr-10Kur.json) · [phases (9)](https://data.orchid-project.org/phases/pages/PU-ZR.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/PU-ZR.html) · [Markdown](https://data.orchid-project.org/systems/PU-ZR.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| model | 3 |
| unspecified | 5 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 5 |
| phase transition | 3 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| PuZr-10Kur.tdb | M. Kurata, IOP Conf. Ser.: Mater. Sci. Eng., 9, 012022(2010). | `b56cc08b0fcadc133a5e30fb3c87a7934f063c37ad5a8e812b6b3659d8a6e9df` | [viewer](https://orchid-project.org/phase-diagrams/#PU-ZR/PuZr-10Kur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/PuZr-10Kur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/PuZr-10Kur.json) |
| PuZr-99Kur.tdb | M. Kurata, Calphad, 23, 305-37(1999). [doi:10.1016/S0364-5916(00)00004-3](https://doi.org/10.1016/S0364-5916%2800%2900004-3) | `c511e212529d822f5c5b56b22066c5bb032a867534fec2e2556abc409f798c00` | [viewer](https://orchid-project.org/phase-diagrams/#PU-ZR/PuZr-99Kur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/PuZr-99Kur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/PuZr-99Kur.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| PuZr-10Kur.tdb | 861.4 | FCC_A1 (x(Zr) 0.65231) + BCC_A2 (x(Zr) 0.72001) + HCP_A3 (x(Zr) 0.85656) |
| PuZr-10Kur.tdb | 558.45 | GAMMA_PU (x(Zr) 0.01746) + FCC_A1 (x(Zr) 0.02759) + PU4ZR (x(Zr) 0.2) |
| PuZr-10Kur.tdb | 514.61 | GAMMA_PU (x(Zr) 0.00805) + BETA_PU (x(Zr) 0.01408) + PU4ZR (x(Zr) 0.2) |
| PuZr-10Kur.tdb | 506.77 | PU4ZR (x(Zr) 0.2) + FCC_A1 (x(Zr) 0.59261) + HCP_A3 (x(Zr) 0.87078) |
| PuZr-10Kur.tdb | 397.42 | ALPHA_PU (x(Zr) 5.100e-4) + BETA_PU (x(Zr) 0.00105) + PU4ZR (x(Zr) 0.2) |
| PuZr-99Kur.tdb | 1179.2 | LIQUID (x(Zr) 0.12872) + FCC_A1 (x(Zr) 0.2131) + BCC_A2 (x(Zr) 0.25791) |
| PuZr-99Kur.tdb | 1077.46 | LIQUID (x(Zr) 0.07142) + BCC_A2 (x(Zr) 0.15202) + FCC_A1 (x(Zr) 0.15313) |
| PuZr-99Kur.tdb | 857.69 | FCC_A1 (x(Zr) 0.62309) + BCC_A2 (x(Zr) 0.70391) + HCP_A3 (x(Zr) 0.86681) |
| PuZr-99Kur.tdb | 650.42 | FCC_A1 (x(Zr) 0.11906) + PU4ZR (x(Zr) 0.16859) + FCC_A1#2 (x(Zr) 0.3953) |
| PuZr-99Kur.tdb | 583.26 | PU4ZR (x(Zr) 0.17247) + FCC_A1 (x(Zr) 0.52571) + HCP_A3 (x(Zr) 0.88727) |
| PuZr-99Kur.tdb | 564.35 | GAMMA_PU (x(Zr) 0.00294) + FCC_A1 (x(Zr) 0.0112) + PU4ZR (x(Zr) 0.13509) |
| PuZr-99Kur.tdb | 505.29 | GAMMA_PU (x(Zr) 0.00126) + BETA_PU (x(Zr) 0.00529) + PU4ZR (x(Zr) 0.12966) |
| PuZr-99Kur.tdb | 397.62 | ALPHA_PU (x(Zr) 9.400e-4) + BETA_PU (x(Zr) 9.400e-4) + PU4ZR (x(Zr) 0.12722) |
| PuZr-99Kur.tdb | 397.62 | ALPHA_PU (x(Zr) 9.400e-4) + BETA_PU (x(Zr) 9.400e-4) + PU4ZR (x(Zr) 0.12722) |
| PuZr-99Kur.tdb | 314.72 | ALPHA_PU (x(Zr) 7.500e-4) + PU4ZR (x(Zr) 0.13965) + HCP_A3 (x(Zr) 0.99347) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/PU/PU-ZR.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/PU/PU-ZR.json) · [CALPHAD hull PuZr-99Kur](https://data.orchid-project.org/hulls/calphad-sgte/PU/PU-ZR--PuZr-99Kur.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Pu–Zr system (5)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 891 | (δ-Pu,γ-Zr) + α-Zr \<=> (ε-Pu,β-Zr) | (δ-Pu,γ-Zr): Zr 0.5; (ε-Pu,β-Zr): Zr 0.5 | unspecified | [1] Kurata 1999; _cites ref. 60Mar_ | Table 5, p. 18, row 7; `ORC-5XGCHY5DXV` |  |
| 870 | (δ-Pu,γ-Zr) + α-Zr \<=> (ε-Pu,β-Zr) | (δ-Pu,γ-Zr): Zr 0.5; (ε-Pu,β-Zr): Zr 0.5 | unspecified | [1] Kurata 1999; _cites ref. 92Suz_ | Table 5, p. 18, row 8; `ORC-OJTFJR55WN` |  |
| 870 | (δ-Pu,γ-Zr) + α-Zr \<=> (ε-Pu,β-Zr) | (δ-Pu,γ-Zr): Zr 0.5; (ε-Pu,β-Zr): Zr 0.5 | model | [1] Kurata 1999 | Table 5, p. 18, row 6; `ORC-ZA5WBVAQA2` |  |
| 758 | δ-Pu \<=> (ε-Pu,β-Zr) + (δ-Pu,γ-Zr) | (ε-Pu,β-Zr): Zr 0.5; (δ-Pu,γ-Zr): Zr 0.5 | model | [1] Kurata 1999 | Table 5, p. 18, row 4; `ORC-UEKNJ2KEFZ` |  |
| 758 | δ-Pu \<=> (ε-Pu,β-Zr) + (δ-Pu,γ-Zr) | (ε-Pu,β-Zr): Zr 0.5; (δ-Pu,γ-Zr): Zr 0.5 | unspecified | [1] Kurata 1999; _cites ref. 60Mar_ | Table 5, p. 18, row 5; `ORC-WR5LDCORSS` |  |

## Other properties

### Phase transition (3)

Table: Phase transition, Pu–Zr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 903 K | 903 | (ε-Pu,β-Zr) \<=> (δ-Pu,γ-Zr); _(ε-Pu,β-Zr): Zr 0.5; (δ-Pu,γ-Zr): Zr 0.5_ | unspecified | [1] Kurata 1999; _cites ref. 92Suz_ | Table 5, p. 18, row 3; `ORC-VADSBWDBB2` |  |
| Phase transition | 904 K | 904 | (ε-Pu,β-Zr) \<=> (δ-Pu,γ-Zr); _(ε-Pu,β-Zr): Zr 0.5; (δ-Pu,γ-Zr): Zr 0.5_ | model | [1] Kurata 1999 | Table 5, p. 18, row 1; `ORC-QHNVWJ5GFP` |  |
| Phase transition | 913 K | 913 | (ε-Pu,β-Zr) \<=> (δ-Pu,γ-Zr); _(ε-Pu,β-Zr): Zr 0.5; (δ-Pu,γ-Zr): Zr 0.5_ | unspecified | [1] Kurata 1999; _cites ref. 60Mar_ | Table 5, p. 18, row 2; `ORC-NY6UU2I4BA` |  |

## Sources

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

1. Masaki Kurata, Thermodynamic assessment of the Pu-U, Pu-Zr, and Pu-U-Zr systems, Calphad 23, 305-337 (1999). [doi:10.1016/s0364-5916(00)00004-3](https://doi.org/10.1016/s0364-5916%2800%2900004-3)

## 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-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- 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_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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/).