# Pr–O system > Pr–O system: 0 accepted literature values (none) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/PR-O.html · Markdown: https://data.orchid-project.org/systems/PR-O.md 0 accepted literature values from 0 paper(s); 2 calculated phase diagram(s). Data: [interactive phase diagram](https://orchid-project.org/phase-diagrams/#PR-O/PrO-16McM.json) · [Markdown](https://data.orchid-project.org/systems/PR-O.md) ## 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 | |---|---|---|---| | PrO-16McM.tdb | J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016). [doi:10.1111/jace.14049](https://doi.org/10.1111/jace.14049) | `fd82f7ae5dbcbe77526f3a402507cd96bb12e0e2f0c9adecc9ddc21a916cf499` | [viewer](https://orchid-project.org/phase-diagrams/#PR-O/PrO-16McM.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/PrO-16McM.json) | | PrO-23Nak.tdb | R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023). [doi:10.1016/j.calphad.2023.102636](https://doi.org/10.1016/j.calphad.2023.102636) | `b6f76e9bff832536d2c6ba9816ac4f06048c17ef2c2dedfff2b68eff28cc7a35` | [viewer](https://orchid-project.org/phase-diagrams/#PR-O/PrO-23Nak.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/PrO-23Nak.json) | Table: Calculated three-phase invariants (model, mole fraction of the second component) | TDB file | T (K) | Phases at the invariant | |---|---:|---| | PrO-16McM.tdb | 870.1 | PRO2_C1#2 (x(O) 0.65062) + PRO2_C1 (x(O) 0.66281) + O2GAS (x(O) 1) | | PrO-16McM.tdb | 849.15 | PR9O16 (x(O) 0.64) + PR10O18 (x(O) 0.64286) + PRO2_C1 (x(O) 0.64496) | | PrO-16McM.tdb | 818.73 | PR10O18 (x(O) 0.64286) + PRO2_C1#2 (x(O) 0.64959) + PRO2_C1 (x(O) 0.66345) | | PrO-16McM.tdb | 771.95 | PR10O18 (x(O) 0.64286) + PR11O20 (x(O) 0.64516) + PRO2_C1 (x(O) 0.66444) | | PrO-16McM.tdb | 746.33 | PR11O20 (x(O) 0.64516) + PR6O11 (x(O) 0.64706) + PRO2_C1 (x(O) 0.66479) | | PrO-16McM.tdb | 681.3 | PR10O18 (x(O) 0.64286) + PR11O20 (x(O) 0.64516) + PR6O11 (x(O) 0.64706) | ## Please cite - 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 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 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; 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). 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_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_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/).