# Cu–Pr system > Cu–Pr system: 29 accepted literature values (formation 19, invariant reaction 10) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/CU-PR.html · Markdown: https://data.orchid-project.org/systems/CU-PR.md 29 accepted literature values from 1 paper(s) (model 22, unspecified 7); 1 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/CU-PR.json) · [CSV](https://data.orchid-project.org/systems/CU-PR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CU-PR) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CU-PR/CuPr-96Zhu.json) · [phases (10)](https://data.orchid-project.org/phases/pages/CU-PR.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CU-PR.html) · [Markdown](https://data.orchid-project.org/systems/CU-PR.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | model | 22 | | unspecified | 7 | Table: Accepted values by property group | Property group | Values | |---|---:| | invariant reaction | 10 | | formation | 19 | ## 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 | |---|---|---|---| | CuPr-96Zhu.tdb | W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996). [doi:10.1007/BF02665998](https://doi.org/10.1007/BF02665998) | `80386a76c9a9fa0e8e07a92263a0a221c83ee59718ec54cc2c7c7538a4fa70fb` | [viewer](https://orchid-project.org/phase-diagrams/#CU-PR/CuPr-96Zhu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CuPr-96Zhu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CuPr-96Zhu.json) | Table: Calculated three-phase invariants (model, mole fraction of the second component) | TDB file | T (K) | Phases at the invariant | |---|---:|---| | CuPr-96Zhu.tdb | 1169.81 | FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.0857) + CU6PR (x(Pr) 0.14286) | | CuPr-96Zhu.tdb | 1169.81 | FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.08563) + CU6PR (x(Pr) 0.14286) | | CuPr-96Zhu.tdb | 1169.81 | FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.08555) + CU6PR (x(Pr) 0.14286) | | CuPr-96Zhu.tdb | 1107.11 | CU6PR (x(Pr) 0.14286) + CU5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.24126) | | CuPr-96Zhu.tdb | 1107.1 | CU6PR (x(Pr) 0.14286) + CU5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.24148) | | CuPr-96Zhu.tdb | 1091.84 | CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25073) | | CuPr-96Zhu.tdb | 1091.84 | CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25067) | | CuPr-96Zhu.tdb | 1091.84 | CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25091) | | CuPr-96Zhu.tdb | 1068.69 | CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.26977) + CU2PR (x(Pr) 0.33333) | | CuPr-96Zhu.tdb | 1068.68 | CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.27001) + CU2PR (x(Pr) 0.33333) | | CuPr-96Zhu.tdb | 1068.68 | CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.27005) + CU2PR (x(Pr) 0.33333) | | CuPr-96Zhu.tdb | 1063.4 | LIQUID (x(Pr) 0.90778) + BCC_A2 (x(Pr) 0.99845) + DHCP (x(Pr) 1) | | CuPr-96Zhu.tdb | 1063.4 | LIQUID (x(Pr) 0.90787) + BCC_A2 (x(Pr) 0.99845) + DHCP (x(Pr) 1) | | CuPr-96Zhu.tdb | 564.75 | CU2PR (x(Pr) 0.33333) + LIQUID (x(Pr) 0.65309) + DHCP (x(Pr) 1) | | CuPr-96Zhu.tdb | 564.75 | CU2PR (x(Pr) 0.33333) + LIQUID (x(Pr) 0.65304) + DHCP (x(Pr) 1) | Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CU/CU-PR.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CU/CU-PR.json) ## Invariant reactions (literature) Table: Invariant reactions reported in the literature for the Cu–Pr system (10) | T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote | |---:|---|---|---|---|---|---| | 1218 | congruent melting: liq -> Cu6Pr | L: Pr 0.143; Cu6Pr: Cu 0.857143, Pr 0.142857 | model | [1] Zhuang 1996 | Table 5, p. 7, row 2; `ORC-57NLJBTHRY` | | | 1169 | eutectic: liq -> Cu(fcc) + Cu6Pr | L: Pr 0.086; Cu6Pr: Cu 0.857143, Pr 0.142857 | model | [1] Zhuang 1996 | Table 5, p. 7, row 1; `ORC-JNCW6235HP` | | | 1104 | peritectic: liq + Cu6Pr -> Cu5Pr | L: Pr 0.243; Cu6Pr: Cu 0.857143, Pr 0.142857; Cu5Pr: Cu 0.833333, Pr 0.166667 | model | [1] Zhuang 1996 | Table 5, p. 7, row 3; `ORC-6EEWY34CLT` | | | 1104 | congruent melting: liq -> Cu2Pr | L: Pr 0.333; Cu2Pr: Cu 0.666667, Pr 0.333333 | model | [1] Zhuang 1996 | Table 5, p. 7, row 6; `ORC-JD43BPRMYE` | | | 1100 | peritectic: liquid + Cu6Pr -> Cu5Pr | | model | [1] Zhuang 1996 | p. 4; `ORC-6A3NQ4Y4Y2` | “According to the formation rule of the other CusR phases, CusPr is likely to form from Cu6Pr and liquid through a peritectic reaction at about 1100 K, which is determined by interpolation of the melting data of other CusR phases.” | | 1093 | peritectic: liq + Cu5Pr -> Cu4Pr | L: Pr 0.249; Cu5Pr: Cu 0.833333, Pr 0.166667; Cu4Pr: Cu 0.8, Pr 0.2 | model | [1] Zhuang 1996 | Table 5, p. 7, row 4; `ORC-PQIL3S2RGF` | | | 1069 | eutectic: liq -> Cu4Pr + Cu2Pr | L: Pr 0.27; Cu4Pr: Cu 0.8, Pr 0.2; Cu2Pr: Cu 0.666667, Pr 0.333333 | model | [1] Zhuang 1996 | Table 5, p. 7, row 5; `ORC-YGL6WZS3VW` | | | 1068 | metatectic/catatectic: Pr(bcc) -> liq + Pr(dcph) | L: Pr 0.912 | model | [1] Zhuang 1996 | Table 5, p. 7, row 9; `ORC-DZPMZXRVMC` | | | 855 | peritectic: liq + Cu2Pr -> CuPr | L: Pr 0.53; Cu2Pr: Cu 0.666667, Pr 0.333333; CuPr: Cu 0.5, Pr 0.5 | model | [1] Zhuang 1996 | Table 5, p. 7, row 7; `ORC-3CSGEQX6YG` | | | 715 | eutectic: liq -> CuPr + Pr(dcph) | L: Pr 0.698; CuPr: Cu 0.5, Pr 0.5 | model | [1] Zhuang 1996 | Table 5, p. 7, row 8; `ORC-FJRCDVA7FB` | | ## 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, Cu–Pr system (19) | Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote | |---|---|---:|---:|---|---:|---:|---|---|---| | Cu2R | | -43.6 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 88Sub4_ | Table 10, p. 13, row 29; `ORC-JEKCFCRLND` | | | Cu2R | | -31.5 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 30; `ORC-N5CC3QSU27.9a143e` | | | Cu2R | | -19.7 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 28; `ORC-BLJUMK6WV4` | | | Cu2R | | -14.5 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 94Fit_ | Table 10, p. 13, row 31; `ORC-VLJ35MZGIL` | | | Cu4R | | -31.5 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 30; `ORC-N5CC3QSU27.15de23` | | | Cu4R | | -27.8 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 88Sub4_ | Table 10, p. 13, row 26; `ORC-T2F5T6ITH5` | | | Cu4R | | -22.2 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 27; `ORC-WDBUJU32L6` | | | Cu4R | | -15.1 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 25; `ORC-U2SJBWDZJ6` | | | Cu5R | | -30.7 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 88Sub4_ | Table 10, p. 13, row 23; `ORC-6YPAAGR5NX` | | | Cu5R | | -18.8 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 24; `ORC-VLXGSJL66V` | | | Cu5R | | -13.8 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 22; `ORC-J4LCGSWFCO` | | | Cu6R | | -33.6 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 88Sub4_ | Table 10, p. 13, row 19; `ORC-X7VJ6SEACL` | | | Cu6R | | -16.1 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 20; `ORC-XJYVTPU4BB` | | | Cu6R | | -12.7 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 18; `ORC-CU4EELABUC.71cc49` | | | Cu6R | | -11.3 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 94Fit_ | Table 10, p. 13, row 21; `ORC-TGH3SU7ADG` | | | CuR | | -46.7 kJ/mol (basis unstated) | | unspecified | | | [1] Zhuang 1996; _cites ref. 88Sub4_ | Table 10, p. 13, row 33; `ORC-2VZ7P5PQAY` | | | CuR | | -31 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 34; `ORC-L4COFGD2UI` | | | CuR | | -19 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 32; `ORC-2JCBDSH3DB` | | | CuR | | -12.7 kJ/mol (basis unstated) | | model | | | [1] Zhuang 1996 | Table 10, p. 13, row 18; `ORC-CU4EELABUC.f0d20c` | | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. W. Zhuang, Z. -Y. Qiao, S. Wei, J. Shen, Thermodynamic evaluation of the Cu-R (R: Ce, Pr, Nd, Sm) binary systems, JPE 17, 508-521 (1996). [doi:10.1007/bf02665998](https://doi.org/10.1007/bf02665998) ## 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=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).