# Cr–Zn system

> Cr–Zn system: 28 accepted literature values (invariant reaction 18, phase equilibrium 8, phase transition 2) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

28 accepted literature values from 3 paper(s) (experimental 20, model 8); 3 calculated phase diagram(s). 1 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/CR-ZN.json) · [CSV](https://data.orchid-project.org/systems/CR-ZN.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CR-ZN) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CR-ZN/CrZn-03Reu-LB.json) · [phases (6)](https://data.orchid-project.org/phases/pages/CR-ZN.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CR-ZN.html) · [Markdown](https://data.orchid-project.org/systems/CR-ZN.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 20 |
| model | 8 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 18 |
| phase transition | 2 |
| phase equilibrium | 8 |

## 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 |
|---|---|---|---|
| CrZn-03Reu-LB.tdb | G. Reumont, P. Perrot, J. Phase Equilib., 24, 50-54(2003). [doi:10.1007/s11669-003-0006-4](https://doi.org/10.1007/s11669-003-0006-4) | `a1b249392f3b86f074a91ec7a8fb040f8e7012cbc10bcb5f2785c8cbe2d038f9` | [viewer](https://orchid-project.org/phase-diagrams/#CR-ZN/CrZn-03Reu-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrZn-03Reu-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrZn-03Reu-LB.json) |
| CrZn-10Su.tdb | X. Su, Y. Liu, D.Y.H. Liu, J.-C. Tedenac, F. Yin, J. Wang, J. Alloys Compd., 496, 159-63(2010). [doi:10.1016/j.jallcom.2010.02.087](https://doi.org/10.1016/j.jallcom.2010.02.087) | `132759fcba46e488477c83338c1778991e90c75c10a5755d55c72f9427a79d78` | [viewer](https://orchid-project.org/phase-diagrams/#CR-ZN/CrZn-10Su.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrZn-10Su.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrZn-10Su.json) |
| CrZn-98Ans.tdb | I. Ansara, COST 507, Final report round 2, 1998. | `1d3d06ce513339db7e817ebce0de710dee11690a6709dda938f1e5052d7ebcba` | [viewer](https://orchid-project.org/phase-diagrams/#CR-ZN/CrZn-98Ans.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrZn-98Ans.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrZn-98Ans.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CrZn-03Reu-LB.tdb | 753.49 | BCC_A2 (x(Zn) 5.000e-5) + CRZN13 (x(Zn) 0.92857) + LIQUID (x(Zn) 0.96352) |
| CrZn-03Reu-LB.tdb | 753.49 | BCC_A2 (x(Zn) 5.000e-5) + CRZN13 (x(Zn) 0.92857) + LIQUID (x(Zn) 0.96345) |
| CrZn-03Reu-LB.tdb | 753.49 | BCC_A2 (x(Zn) 5.000e-5) + CRZN13 (x(Zn) 0.92857) + LIQUID (x(Zn) 0.96345) |
| CrZn-03Reu-LB.tdb | 735.32 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.98416) |
| CrZn-03Reu-LB.tdb | 735.32 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.9843) |
| CrZn-03Reu-LB.tdb | 735.32 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.98412) |
| CrZn-03Reu-LB.tdb | 735.32 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.9843) |
| CrZn-03Reu-LB.tdb | 691.46 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.9977) + HCP_A3 (x(Zn) 1) |
| CrZn-03Reu-LB.tdb | 691.46 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99775) + HCP_A3 (x(Zn) 1) |
| CrZn-03Reu-LB.tdb | 691.46 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99776) + HCP_A3 (x(Zn) 1) |
| CrZn-10Su.tdb | 736.12 | BCC_A2 (x(Zn) 0.02062) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99844) |
| CrZn-10Su.tdb | 736.12 | BCC_A2 (x(Zn) 0.02061) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99843) |
| CrZn-10Su.tdb | 692.56 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99978) + HCP_A3 (x(Zn) 1) |
| CrZn-10Su.tdb | 692.56 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99978) + HCP_A3 (x(Zn) 1) |
| CrZn-98Ans.tdb | 761.42 | BCC_A2 (x(Zn) 5.000e-5) + CRZN13 (x(Zn) 0.92857) + LIQUID (x(Zn) 0.99632) |
| CrZn-98Ans.tdb | 761.42 | BCC_A2 (x(Zn) 5.000e-5) + CRZN13 (x(Zn) 0.92857) + LIQUID (x(Zn) 0.99632) |
| CrZn-98Ans.tdb | 736.52 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99842) |
| CrZn-98Ans.tdb | 736.52 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99841) |
| CrZn-98Ans.tdb | 736.52 | CRZN13 (x(Zn) 0.92857) + CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99842) |
| CrZn-98Ans.tdb | 692.55 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99977) + HCP_A3 (x(Zn) 1) |
| CrZn-98Ans.tdb | 692.55 | CRZN17 (x(Zn) 0.94444) + LIQUID (x(Zn) 0.99977) + HCP_A3 (x(Zn) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CR/CR-ZN.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CR/CR-ZN.json) · [CALPHAD hull CrZn-03Reu-LB](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-ZN--CrZn-03Reu-LB.json) · [CALPHAD hull CrZn-98Ans](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-ZN--CrZn-98Ans.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Cr–Zn system (18)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 761.4 | peritectic: Liquid + bcc-A2 -> CrZn13\* | L: Zn 0.996; bcc-A2: Zn 0; CrZn13: Zn 0.928 | model | [1] (ed.) 1998 | Table I, p. 175, row 1; `ORC-HNM2QOSD4B` |  |
| 754 | peritectic: L + bcc_A2 -> CrZn13 | L: Zn 0.9628; bcc_A2: Zn 0; CrZn13: Zn 0.928 | model | [2] Reumont 2003 | Table 2, p. 4, row 1; `ORC-QGAQSBMV5C` |  |
| 753.15 | L + bcc_A2 -> CrZn13 | CrZn13: Zn 0.928571 | experimental | [2] Reumont 2003 | Table 1, p. 3, row 2; `ORC-STTUF6BGKJ` |  |
| 737.15 | peritectic |  | experimental | [2] Reumont 2003 | p. 1; `ORC-ZYNGIN6724` | “The peritectic transformation of CrZn17 occurs at 464 °C, whereas the temperature of decomposition of CrZn13 is unknown experimentally.” |
| 737 | peritectic: L + CrZn13 -> CrZn17 | CrZn13: Zn 0.928571; CrZn17: Zn 0.944444 | experimental | [2] Reumont 2003 | Table 2, p. 4, row 3; `ORC-B6FLASPY5Z` |  |
| 737 | L + (Cr) -> CrZn17 | L: Zn 0.988; CrZn17: Zn 0.944444 | experimental | [3] Su 2010; _cites Heumann 1948_ [doi](https://doi.org/10.1515/ijmr-1948-390202) | Table 5, p. 4, row 4; `ORC-RH6TMP7HWC` |  |
| 736.9 | L + (Cr) -> CrZn17 | L: Zn 0.9984; CrZn17: Zn 0.944444 | model | [3] Su 2010 | Table 5, p. 4, row 3; `ORC-LANXO5ETPQ` |  |
| 736.5 | peritectic: Liquid + CrZn13 -> CrZn17 | L: Zn 0.998; CrZn13: Zn 0.928; CrZn17: Zn 0.944 | model | [1] (ed.) 1998 | Table I, p. 175, row 2; `ORC-E4LURU5Y2W` |  |
| 736 | peritectic: L + CrZn13 -> CrZn17 | L: Zn 0.9851; CrZn13: Zn 0.928; CrZn17: Zn 0.9444 | model | [2] Reumont 2003 | Table 2, p. 4, row 2; `ORC-5CBBHD4YKF` |  |
| 735.15 | L + CrZn13 -> CrZn17 °C | CrZn13: Zn 0.928571; CrZn17: Zn 0.944444 | experimental | [2] Reumont 2003 | Table 1, p. 3, row 1; `ORC-OIXI6GTVOU` |  |
| 692.6 | eutectic: L -> (hcp(Zn)) + CrZn17 | L: Zn 0.9998; CrZn17: Zn 0.944444 | model | [3] Su 2010 | Table 5, p. 4, row 1; `ORC-X3VJLPDROG` |  |
| 692.5 | other: Liquid -> CrZn17 + hcp-Zn | L: Zn 0.999; CrZn17: Zn 0.944; hcp-Zn: Zn 0.999 | model | [1] (ed.) 1998 | Table I, p. 175, row 3; `ORC-LQ33ZVT4J7` |  |
| 691.15 | eutectic |  | experimental | [2] Reumont 2003; _cites Weiss 1942_ | p. 1; `ORC-IK4C2VYEKP` | “However, \[1942Wei\] proposed a Guy Reumont and Pierre Perrot, LMPGM, UMR CNRS 8517, Université de Lille I, Villeneuve d'Ascq, France. Contact e-mail: Guy.Reumont@univ-lille1.fr. eutectic temperature at 418 °C and estimated the Cr content in the liquid phase as 0.31 at.% Cr at that temperature.” |
| 691 | eutectic: L -> CrZn17 + hcp_A3 | L: Zn 0.998; CrZn17: Zn 0.9444; hcp_A3: Zn 0.9999 | model | [2] Reumont 2003 | Table 2, p. 4, row 4; `ORC-XMJGBQJC26` |  |
| 688.15 | eutectic |  | experimental | [2] Reumont 2003; _cites Heumann 1948_ | p. 1; `ORC-6M3NRRHNCB` | “According to \[1948Heu\], at the eutectic temperature (415 °C), the maximum solubility of Cr in solid Zn closepacked hexagonal (cph) solution is very low and was accepted as 0.04 at.% Cr.” |
| 688.15 | eutectic: L → hcp(Zn) + CrZn17 |  | experimental | [3] Su 2010; _cites Heumann 1948_ | p. 2; `ORC-FWTFDR2MT7` | “The eutectic reaction L → hcp(Zn) + CrZn17 occurred at 415 ◦ C according to the results of Heumann \[9\].” |
| 688 | eutectic: L -> (hcp(Zn)) + CrZn17 | L: Zn 0.9997; CrZn17: Zn 0.944444 | experimental | [3] Su 2010; _cites Heumann 1948_ [doi](https://doi.org/10.1515/ijmr-1948-390202) | Table 5, p. 4, row 2; `ORC-FYI4SZOQTY` |  |
| 688 | eutectic: L -> CrZn17 + hcp_A3 | CrZn17: Zn 0.944444 | experimental | [2] Reumont 2003 | Table 2, p. 4, row 5; `ORC-WM2A2XN6Q6` |  |

## Other properties

### Phase transition (2)

Table: Phase transition, Cr–Zn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 723.15 K | 723.15 | Solubility in the liquid phase; _L: Zn 0.99_ | experimental | [2] Reumont 2003 | Table 1, p. 3, row 4; `ORC-WTOLQMD4WN` |  |
| Phase transition | 733.15 K | 733.15 | Solubility in the liquid phase; _L: Zn 0.987_ | experimental | [2] Reumont 2003 | Table 1, p. 3, row 5; `ORC-WSTVTQJDLF` |  |

### Phase equilibrium (8)

Table: Phase equilibrium, Cr–Zn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 653.15 | Zn + CrZn17; _Zn: Cr 0, Zn 1; CrZn17: Cr 0.058, Zn 0.942_ | experimental | [3] Su 2010 | Table 3, p. 3, row 1; `ORC-2TDYKXWWQJ` |  |
| Phase composition |  | 703.15 | (Cr) + CrZn17; _(Cr): Cr 0.993, Zn 0.007; CrZn17: Cr 0.063, Zn 0.937_ | experimental | [3] Su 2010 | Table 3, p. 3, row 3; `ORC-UBWT25FQR2` |  |
| Phase composition |  | 703.15 | Zn + CrZn17; _Zn: Cr 0.009, Zn 0.991; CrZn17: Cr 0.061, Zn 0.939_ | experimental | [3] Su 2010 | Table 3, p. 3, row 2; `ORC-6RCC6KAJVL` |  |
| Phase composition |  | 973.15 | β-Cr + Liquid; _β-Cr: Cr 0.972, Zn 0.028; Liquid: Cr 0.011, Zn 0.989_ | experimental | [3] Su 2010 | Table 2, p. 2, row 1; `ORC-PI6VLRPVB6` |  |
| Phase composition |  | 1073.15 | β-Cr + Liquid; _β-Cr: Cr 0.985, Zn 0.015; Liquid: Cr 0.02, Zn 0.98_ | experimental | [3] Su 2010 | Table 2, p. 2, row 2; `ORC-57BZC3LRZJ` |  |
| Phase composition |  | 1173.15 | β-Cr + Liquid; _β-Cr: Cr 0.992, Zn 0.008; Liquid: Cr 0.018, Zn 0.982_ | experimental | [3] Su 2010 | Table 2, p. 2, row 3; `ORC-NBRHLYBOBJ` |  |
| Phase composition |  | 1273.15 | Liquid; _Liquid: Cr 0.04, Zn 0.96_ | experimental | [3] Su 2010 | Table 2, p. 2, row 4; `ORC-QZQLFUKZWV` |  |
| Phase composition |  | 1373.15 | β-Cr + Liquid; _β-Cr: Cr 0.992, Zn 0.008; Liquid: Cr 0.096, Zn 0.904_ | experimental | [3] Su 2010 | Table 2, p. 2, row 5; `ORC-RM6EEKSTWQ` |  |

## Sources

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

1. I. Ansara, A. T. Dinsdale, M. H. Rand (eds.), COST 507: Thermochemical database for light metal alloys, Volume 2, EUR 18499 EN, Office for Official Publications of the European Communities, Luxembourg (1998), ISBN 92-828-3902-8.
2. Guy Reumont, Pierre Perrot, Thermodynamic assessment of the Zinc-Rich part of the Cr-Zn system, JPE 24, 50-54 (2003). [doi:10.1007/s11669-003-0006-4](https://doi.org/10.1007/s11669-003-0006-4)
3. Xuping Su, Ya Liu, Daniel Y.H. Liu, Jean-Claude Tedenac, Fucheng Yin, Jianhua Wang, Experimental investigation and thermodynamic assessment of the Zn–Cr system, Journal of Alloys and Compounds 496, 159-163 (2010). [doi:10.1016/j.jallcom.2010.02.087](https://doi.org/10.1016/j.jallcom.2010.02.087)

## 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/).