Nb–U system

6 accepted literature values from 1 paper(s) (experimental 3, model 3); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (6) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	3
model	3

Accepted values by property group
Property group	Values
invariant reaction	6

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.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
NbU-08Liu.tdb	X.J. Liu, Z.S. Li, J. Wang, C.P. Wang, J. Nucl. Mater., 380, 99-104(2008). doi:10.1016/j.jnucmat.2008.07.008	`5357c3b05f77c8585ffd1ff3a4e5f6aa7761f180dedf739a432872dc850828af`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
NbU-08Liu.tdb	937.63	BCC_A2 (x(U) 0.89892) + TETRAGONAL_U (x(U) 0.9872) + ORTHORHOMBIC_A20 (x(U) 0.98902)
NbU-08Liu.tdb	919.62	BCC_A2#2 (x(U) 0.30124) + BCC_A2 (x(U) 0.8611) + ORTHORHOMBIC_A20 (x(U) 0.98625)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Nb–U system (6)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1231.15	critical point: (γU, Nb) → γU + (Nb)	(γU, Nb): Nb 0.507	model	[1] Liu 2008	Table 6, p. 6, row 6 report
1203.15	critical point: (γU, Nb) → γU + (Nb)	(γU, Nb): Nb 0.523	experimental	[1] Liu 2008 cites Koike 1995	Table 6, p. 6, row 5 report
937.15	eutectoid: βU → αU + γU	βU: Nb 0.013	experimental	[1] Liu 2008 cites Koike 1995	Table 6, p. 6, row 1 report
937.15	eutectoid: βU → αU + γU	βU: Nb 0.013; αU: Nb 0.0109; γU: Nb 0.101	model	[1] Liu 2008	Table 6, p. 6, row 2 report
920.15	monotectoid: γU → αU + (Nb)	γU: Nb 0.139; αU: Nb 0.013; (Nb): Nb 0.7	model	[1] Liu 2008	Table 6, p. 6, row 4 report
920.15	monotectoid: γU → αU + (Nb)	γU: Nb 0.133; αU: Nb 0.005	experimental	[1] Liu 2008 cites Koike 1995	Table 6, p. 6, row 3 report

Sources

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

X.J. Liu, Z.S. Li, J. Wang, C.P. Wang, Thermodynamic modeling of the U–Mn and U–Nb systems, Journal of Nuclear Materials 380, 99-104 (2008). doi:10.1016/j.jnucmat.2008.07.008

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). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi: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). doi: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). doi: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.

@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}
}