# Np–U system > Np–U 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/NP-U.html · Markdown: https://data.orchid-project.org/systems/NP-U.md 0 accepted literature values from 0 paper(s); 2 calculated phase diagram(s). Data: [interactive phase diagram](https://orchid-project.org/phase-diagrams/#NP-U/NpU-10Kur.json) · [phases (9)](https://data.orchid-project.org/phases/pages/NP-U.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/NP-U.html) · [Markdown](https://data.orchid-project.org/systems/NP-U.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 | |---|---|---|---| | NpU-10Kur.tdb | M. Kurata, IOP Conf. Ser.: Mater. Sci. Eng., 9, 012023(2010). | `f85b49b94decbbeefe9a824e17f4121a19093cc3753a579c8652a5c165bffad6` | [viewer](https://orchid-project.org/phase-diagrams/#NP-U/NpU-10Kur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NpU-10Kur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NpU-10Kur.json) | | NpU-18Xie.tdb | W. Xie, D. Morgan, Comput. Mater. Sci., 143, 505-14(2018). [doi:10.1016/j.commatsci.2017.11.042](https://doi.org/10.1016/j.commatsci.2017.11.042) | `1d2cc8e207135d92f81ab45fa040dcb93e08563b16c7d94931fb5d5df86a73f6` | [viewer](https://orchid-project.org/phase-diagrams/#NP-U/NpU-18Xie.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NpU-18Xie.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NpU-18Xie.json) | Table: Calculated three-phase invariants (model, mole fraction of the second component) | TDB file | T (K) | Phases at the invariant | |---|---:|---| | NpU-10Kur.tdb | 941.28 | BCC_A2 (x(U) 0.64671) + NPU_ZETA (x(U) 0.6658) + TETRAGONAL_U (x(U) 0.69334) | | NpU-10Kur.tdb | 918.16 | NPU_ZETA (x(U) 0.71951) + TETRAGONAL_U (x(U) 0.74829) + ORTHORHOMBIC_A20 (x(U) 0.75387) | | NpU-10Kur.tdb | 884.84 | BCC_A2 (x(U) 0.25337) + TETRAG_AD (x(U) 0.26653) + NPU_ZETA (x(U) 0.29497) | | NpU-10Kur.tdb | 514.2 | ORTHO_AC (x(U) 0.04251) + TETRAG_AD (x(U) 0.11713) + NPU_ZETA (x(U) 0.25697) | | NpU-10Kur.tdb | 320.92 | ORTHO_AC (x(U) 0.04146) + NPU_ZETA (x(U) 0.47008) + ORTHORHOMBIC_A20 (x(U) 0.53691) | | NpU-18Xie.tdb | 941.56 | NPU_ZETA (x(U) 0.6004) + BCC_A2 (x(U) 0.61318) + TETRAGONAL_U (x(U) 0.69546) | | NpU-18Xie.tdb | 914.55 | NPU_ZETA (x(U) 0.63408) + TETRAGONAL_U (x(U) 0.71527) + ORTHORHOMBIC_A20 (x(U) 0.72576) | | NpU-18Xie.tdb | 881.43 | TETRAG_AD (x(U) 0.16881) + BCC_A2 (x(U) 0.21009) + NPU_ZETA (x(U) 0.31773) | | NpU-18Xie.tdb | 458.9 | ORTHO_AC (x(U) 0.1032) + TETRAG_AD (x(U) 0.15978) + NPU_ZETA (x(U) 0.23414) | Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/NP/NP-U.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/NP/NP-U.json) · [CALPHAD hull NpU-10Kur](https://data.orchid-project.org/hulls/calphad-sgte/NP/NP-U--NpU-10Kur.json) ## 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-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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_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/).